10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

RQUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF

1934

For the quarterly period ended September 30, 2011

or

o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF

1934

For the transition period from _________ to_________

Commission File Number: 1-16095

Aetna Inc.

(Exact name of registrant as specified in its charter)

Pennsylvania (State or other jurisdiction of incorporation or organization)	23-2229683 (I.R.S. Employer Identification No.)
151 Farmington Avenue, Hartford, CT (Address of principal executive offices)	06156 (Zip Code)
Registrant's telephone number, including area code:	(860) 273-0123

Former name, former address and former fiscal year, if changed since last report: N/A

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. þYesoNo

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter)

during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).

þYesoNo

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer þ	Accelerated filer o
Non-accelerated filer o(Do not check if a smaller reporting company)	Smaller reporting company o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). o Yes þ No

There were 362.3 million shares of the registrant's voting common stock with a par value of $.01 per share outstanding at September 30, 2011.

Aetna Inc.

Form 10-Q

For the Quarterly Period Ended September 30, 2011

Unless the context otherwise requires, references to the terms “we,” “our” or “us” used throughout this Quarterly Report on Form 10-Q (except the Report of Independent Registered Public Accounting Firm on page 32 ), refer to Aetna Inc. (a Pennsylvania corporation) (“Aetna”) and its subsidiaries (collectively, the “Company”).

Table of Contents		Page
Part I	Financial Information
Item 1.	Financial Statements	1
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	33
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	48
Item 4.	Controls and Procedures	48
Part II	Other Information
Item 1.	Legal Proceedings	49
Item 1A.	Risk Factors	49
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	49
Item 6.	Exhibits	50
Signatures		51
Index to Exhibits		52

Part I. Financial Information

Item 1. Financial Statements

Consolidated Statements of Income

(Unaudited)

	For the Three Months					For the Nine Months
	Ended September 30,					Ended September 30,
(Millions, except per common share data)	2011			2010		2011			2010
Revenue:
Health care premiums	$	6,776.7		$	6,908.9	$	20,260.7		$	20,719.2
Other premiums	439.8			448.9		1,336.9			1,384.1
Fees and other revenue (1)	946.6			853.2		2,742.7			2,626.0
Net investment income	233.6			248.2		727.5			777.1
Net realized capital gains	78.6			79.6		139.7			199.7
Total revenue	8,475.3			8,538.8		25,207.5			25,706.1
Benefits and expenses:
Health care costs (2)	5,345.5			5,649.3		16,060.3			16,998.9
Current and future benefits	470.7			480.9		1,433.9			1,488.6
Operating expenses:
Selling expenses	269.1			304.8		827.0			928.8
General and administrative expenses	1,547.2			1,249.3		4,144.5			3,700.6
Total operating expenses	1,816.3			1,554.1		4,971.5			4,629.4
Interest expense	59.7			63.9		187.3			185.5
Amortization of other acquired intangible assets	31.7			23.4		83.6			72.0
Total benefits and expenses	7,723.9			7,771.6		22,736.6			23,374.4
Income before income taxes	751.4			767.2		2,470.9			2,331.7
Income taxes:
Current	324.6			103.4		888.6			558.3
Deferred	(63.6		)	166.2		(30.8		)	222.2
Total income taxes	261.0			269.6		857.8			780.5
Net income	$	490.4		$	497.6	$	1,613.1		$	1,551.2
Earnings per common share:
Basic	$	1.33		$	1.21	$	4.28		$	3.67
Diluted	$	1.30		$	1.19	$	4.19		$	3.61

⁽¹⁾  Fees and other revenue include administrative services contract member co-payments and plan sponsor reimbursements related to our mail order and specialty pharmacy operations of $16.4 million and $46.4 million (net of pharmaceutical and processing costs of $317.1 million and $938.0 million) for the three and nine months ended September 30, 2011, respectively, and $22.3 million and $60.5 million (net of pharmaceutical and processing costs of $360.3 million and $1.1 billion) for the three and nine months ended September 30, 2010, respectively.

⁽²⁾  Health care costs have been reduced by Insured member co-payments related to our mail order and specialty pharmacy operations of $31.4 million and $101.0 million for the three and nine months ended September 30, 2011, respectively, and $36.2 million and $113.7 million for the three and nine months ended September 30, 2010, respectively.

Refer to accompanying Condensed Notes to Consolidated Financial Statements (Unaudited).

Page 1

Consolidated Balance Sheets

	(Unaudited)
(Millions)	At September 30, 2011			At December 31, 2010
Assets:
Current assets:
Cash and cash equivalents	$	1,957.8		$	1,867.6
Investments	2,042.7			2,169.7
Premiums receivable, net	807.8			661.9
Other receivables, net	766.6			692.6
Accrued investment income	196.4			203.4
Collateral received under securities loan agreements	—			210.6
Income taxes receivable	24.1			210.1
Deferred income taxes	403.9			327.0
Other current assets	686.6			651.3
Total current assets	6,885.9			6,994.2
Long-term investments	17,663.8			17,546.3
Reinsurance recoverables	926.8			960.1
Goodwill	6,010.3			5,146.4
Other acquired intangible assets, net	779.8			495.5
Property and equipment, net	533.0			529.3
Deferred income taxes	—			29.9
Other long-term assets	735.5			742.4
Separate Accounts assets	5,159.1			5,295.3
Total assets	$	38,694.2		$	37,739.4
Liabilities and shareholders' equity:
Current liabilities:
Health care costs payable	$	2,509.1		$	2,630.9
Future policy benefits	704.4			728.4
Unpaid claims	578.6			593.3
Unearned premiums	794.2			318.7
Policyholders' funds	1,132.1			918.1
Collateral payable under securities loan agreements	—			210.8
Short-term debt	449.9			—
Current portion of long-term debt	—			899.9
Accrued expenses and other current liabilities	2,486.8			2,436.8
Total current liabilities	8,655.1			8,736.9
Future policy benefits	6,099.3			6,276.4
Unpaid claims	1,506.5			1,514.3
Policyholders' funds	1,357.4			1,316.6
Long-term debt, less current portion	3,977.1			3,482.6
Deferred income taxes	224.3			—
Other long-term liabilities	1,186.7			1,226.5
Separate Accounts liabilities	5,159.1			5,295.3
Total liabilities	28,165.5			27,848.6
Commitments and contingencies (Note 14)
Shareholders' equity:
Common stock ($.01 par value; 2.6 billion shares authorized and 362.3 million shares issued
and outstanding in 2011; 2.7 billion shares authorized and 384.4 million shares issued and
outstanding in 2010) and additional paid-in capital	909.6			651.5
Retained earnings	10,620.5			10,401.9
Accumulated other comprehensive loss	(1,001.4		)	(1,162.6		)
Total shareholders' equity	10,528.7			9,890.8
Total liabilities and shareholders' equity	$	38,694.2		$	37,739.4

Refer to accompanying Condensed Notes to Consolidated Financial Statements (Unaudited).

Page 2

Consolidated Statements of Shareholders’ Equity

(Unaudited)

(Millions)	Number of Common Shares Outstanding		Common Stock and Additional Paid-in Capital				Retained Earnings				Accumulated Other Comprehensive Loss				Total Shareholders' Equity				Comprehensive Income
Nine Months Ended September 30, 2011
Balance at December 31, 2010	384.4			$	651.5			$	10,401.9			$	(1,162.6	)		$	9,890.8
Comprehensive income:
Net income	—			—				1,613.1				—				1,613.1				$	1,613.1
Other comprehensive income (Note 8):
Net unrealized gains on securities	—			—				—				138.1				138.1
Net foreign currency and derivative losses	—			—				—				(5.7		)		(5.7		)
Pension and OPEB plans	—			—				—				28.8				28.8
Other comprehensive income	—			—				—				161.2				161.2				161.2
Total comprehensive income																				$	1,774.3
Common shares issued for benefit plans,
including tax benefits	8.6			258.4				—				—				258.4
Repurchases of common shares	(30.7	)		(.3		)		(1,227.3		)		—				(1,227.6		)
Dividends declared	—			—				(167.2		)		—				(167.2		)
Balance at September 30, 2011	362.3			$	909.6			$	10,620.5			$	(1,001.4	)		$	10,528.7
Nine Months Ended September 30, 2010
Balance at December 31, 2009	430.8			$	470.1			$	10,256.7			$	(1,223.0	)		$	9,503.8
Comprehensive income:
Net income	—			—				1,551.2				—				1,551.2				$	1,551.2
Other comprehensive loss (Note 8):
Net unrealized gains on securities	—			—				—				374.5				374.5
Net foreign currency and derivative losses	—			—				—				(53.3		)		(53.3		)
Pension and OPEB plans	—			—				—				(459.8		)		(459.8		)
Other comprehensive loss	—			—				—				(138.6		)		(138.6		)		(138.6		)
Total comprehensive income																				$	1,412.6
Common shares issued for benefit plans,
including tax benefits	2.2			103.7				—				—				103.7
Repurchases of common shares	(32.9	)		(.3		)		(1,007.1		)		—				(1,007.4		)
Dividends declared	—			—				(16.1		)		—				(16.1		)
Balance at September 30, 2010	400.1			$	573.5			$	10,784.7			$	(1,361.6	)		$	9,996.6

Refer to accompanying Condensed Notes to Consolidated Financial Statements (Unaudited).

Page 3

Consolidated Statements of Cash Flows

(Unaudited)

	Nine Months Ended
	September 30,
(Millions)	2011			2010
Cash flows from operating activities:
Net income	$	1,613.1		$	1,551.2
Adjustments to reconcile net income to net cash provided by operating activities:
Net realized capital gains	(139.7		)	(199.7		)
Depreciation and amortization	326.4			313.3
Equity in earnings of affiliates, net	(26.8		)	(9.6		)
Stock-based compensation expense	107.7			85.9
Accretion of net investment discount	(1.1		)	(20.0		)
Changes in assets and liabilities:
Accrued investment income	7.0			1.8
Premiums due and other receivables	(158.4		)	(98.0		)
Income taxes	157.8			206.0
Other assets and other liabilities	(116.5		)	(588.7		)
Health care and insurance liabilities	236.2			(398.5		)
Other, net	8.1			2.9
Net cash provided by operating activities	2,013.8			846.6
Cash flows from investing activities:
Proceeds from sales and maturities of investments	7,704.0			8,796.4
Cost of investments	(7,100.8		)	(8,324.9		)
Additions to property, equipment and software	(227.2		)	(217.1		)
Cash used for acquisition, net of cash acquired	(1,130.2		)	(.1		)
Net cash (used for) provided by investing activities	(754.2		)	254.3
Cash flows from financing activities:
Net repayment of long-term debt	(900.0		)	—
Net issuance of long-term debt	480.1			697.8
Net issuance (repayment) of short-term debt	449.9			(245.4		)
Deposits and interest credited for investment contracts	3.8			4.5
Withdrawals of investment contracts	(6.6		)	(8.1		)
Common shares issued under benefit plans	117.9			12.1
Stock-based compensation tax benefits	31.7			4.2
Common shares repurchased	(1,227.6		)	(932.4		)
Dividends paid to shareholders	(112.9		)	—
Collateral on interest rate swaps	(5.7		)	(41.7		)
Net cash used for financing activities	(1,169.4		)	(509.0		)
Net increase in cash and cash equivalents	90.2			591.9
Cash and cash equivalents, beginning of period	1,867.6			1,203.6
Cash and cash equivalents, end of period	$	1,957.8		$	1,795.5
Supplemental cash flow information:
Interest paid	$	169.0		$	156.4
Income taxes paid	665.0			569.3

Refer to accompanying Condensed Notes to Consolidated Financial Statements (Unaudited).

Page 4

Condensed Notes to Consolidated Financial Statements

(Unaudited)

1. Organization

We conduct our operations in three business segments:

• Health Care consists of medical, pharmacy benefits management, dental and vision plans offered on both an Insured basis (where we assume all or a majority of the risk for medical and dental care costs) and an employer-funded basis (where the plan sponsor under an administrative services contract (“ASC”) assumes all or a majority of this risk).  Medical products include point-of-service (“POS”), preferred provider organization (“PPO”), health maintenance organization (“HMO”) and indemnity benefit plans.  Medical products also include health savings accounts (“HSAs”) and Aetna HealthFund^®, consumer-directed health plans that combine traditional POS or PPO and/or dental coverage, subject to a deductible, with an accumulating benefit account (which may be funded by the plan sponsor and/or the member in the case of HSAs).  We also offer Medicare and Medicaid products and services and specialty products, such as health information exchange technology services, medical management and data analytics services, behavioral health plans and stop loss insurance, as well as products that provide access to our provider network in select geographies.

• Group Insurance primarily includes group life insurance products offered on an Insured basis, including basic and supplemental group term life, group universal life, supplemental or voluntary programs and accidental death and dismemberment coverage.  Group Insurance also includes: (i) group disability products offered to employers on both an Insured and an ASC basis which consist primarily of short-term and long-term disability insurance, (ii) absence management services offered to employers, which include short-term and long-term disability administration and leave management, and (iii) long-term care products that were offered primarily on an Insured basis, which provide benefits covering the cost of care in private home settings, adult day care, assisted living or nursing facilities.  We no longer solicit or accept new long-term care customers.

• Large Case Pensions manages a variety of retirement products (including pension and annuity products) primarily for tax qualified pension plans.  These products provide a variety of funding and benefit payment distribution options and other services.  Large Case Pensions also includes certain discontinued products (refer to Note 17 beginning on page 30 for additional information).

2. Summary of Significant Accounting Policies

Interim Financial Statements

These interim financial statements necessarily rely on estimates, including assumptions as to annualized tax rates.  In the opinion of management, all adjustments necessary for a fair statement of results for the interim periods have been made.  All such adjustments are of a normal, recurring nature.  The accompanying unaudited consolidated financial statements and related notes should be read in conjunction with the consolidated financial statements and related notes presented in our 2010 Annual Report on Form 10-K (our “2010 Annual Report”).  Certain financial information that is normally included in annual financial statements prepared in accordance with U.S. generally accepted accounting principles (“GAAP”), but that is not required for interim reporting purposes, has been condensed or omitted.  We have omitted certain footnote disclosures that would substantially duplicate the disclosures in our 2010 Annual Report, unless the information contained in those disclosures materially changed or is required by GAAP.  We evaluated subsequent events that occurred after September 30, 2011 through the date the financials were issued and determined there were no other items to disclose.

Page 5

Principles of Consolidation

These unaudited consolidated financial statements have been prepared in accordance with GAAP and include the accounts of Aetna and the subsidiaries that we control.  All significant intercompany balances have been eliminated in consolidation.

New Accounting Standards

Troubled Debt Restructurings

In April 2011, the Financial Accounting Standards Board (the “FASB”) released new accounting guidance and additional disclosure requirements relating to a creditor’s restructuring of receivables including mortgage loans.  The new guidance became effective beginning July 1, 2011.  Since we have no material problem, restructured or potential problem mortgage loans, the adoption of this accounting guidance did not have a material impact on our financial position or operating results.

Future Application of Accounting Standards

Testing Goodwill for Impairment

In September 2011, the FASB released new accounting guidance amending the current guidance for testing goodwill for impairment. Under the amendments, an entity has the option to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying value. If management determines that a reporting unit's fair value is likely greater than its carrying amount, then no additional analysis is necessary, and the goodwill is not impaired. The new guidance is effective beginning January 1, 2012, and early adoption is permitted. We do not expect the new guidance to have a material impact on our financial position or operating results.

Fees Paid to the Federal Government by Health Insurers

In July 2011, the FASB released new accounting guidance relating to the recognition and income statement reporting of any mandated fees to be paid to the federal government by health insurers which will be effective January 1, 2014. This guidance will apply primarily to new fees enacted in the Patient Protection and Affordable Care Act and the Health Care and Education Reconciliation Act of 2010 (collectively, "Health Care Reform"). We are evaluating the impact this guidance will have on our financial position or operating results.

Presentations of Comprehensive Income

In June 2011, the FASB released new requirements for the presentation of other comprehensive income in financial statements.  The new requirements eliminate the option that previously existed to present changes in other comprehensive income within the statement of shareholders' equity and require its presentation in either a single continuous statement of comprehensive income or in a separate statement immediately following the statement of income.  The new requirements are effective beginning January 1, 2012 and will affect the presentation of our financial statements, but will not have a material impact on our financial position or operating results.

Fair Value Measurements

In May 2011, the FASB released new guidance relating to fair value measurements.  This new guidance amends and clarifies certain existing fair value measurement principles and requires additional disclosures for all Level 3 assets, including a qualitative discussion about the sensitivity of Level 3 fair value measurements.  The new requirements are effective beginning January 1, 2012 and are not expected to have a material impact on our financial position or operating results.

Reconsideration of Effective Control for Repurchase Agreements

In April 2011, the FASB released new accounting guidance relating to repurchase agreements and other agreements that entitle and obligate a transferor to repurchase or redeem financial assets before maturity.  The guidance prescribes when an entity may recognize a sale upon the transfer of financial assets subject to repurchase agreements.  The new guidance is effective beginning January 1, 2012.  Since we treat these transactions as collateralized borrowings rather than sales, we do not expect the adoption of this accounting guidance to have a material impact on our financial position or operating results.

Page 6

Deferred Acquisition Costs

In October 2010, the FASB released new accounting guidance for costs associated with acquiring or renewing insurance contracts.  This guidance clarifies that such costs qualify for capitalization when affiliated with the successful acquisition of new and renewed insurance contracts.  The new guidance is effective beginning January 1, 2012.  We do not expect the adoption of this accounting guidance to have a material impact on our financial position or operating results.

3. Acquisitions

During the nine months ended September 30, 2011, we completed the acquisitions of Medicity Inc. ("Medicity") and Prodigy Health Group ("Prodigy"). In October 2011, we completed the acquisitions of Genworth Financial, Inc.'s ("Genworth's") Medicare Supplement business and related blocks of in-force business and PayFlex Holdings, Inc. ("PayFlex"). Each of these acquisitions was funded using available resources. Refer to Note 6 on page 9 for additional information.

• Medicity Inc.

In January 2011, we acquired Medicity, a health information exchange company, for approximately $490 million.  We recorded goodwill related to this transaction of approximately $394 million, a majority of which will not be tax deductible.  All of the goodwill related to this acquisition was assigned to our Health Care segment.

• Prodigy Health Group

In June 2011, we acquired Prodigy, a third party administrator of self-funded health care plans, for approximately $600 million.  We preliminarily recorded goodwill related to this transaction of approximately $445 million, of which approximately $52 million will be tax deductible.  All of the goodwill related to this acquisition was assigned to our Health Care segment.

• Genworth Financial, Inc.'s Medicare Supplement Business and Related Blocks of In-Force Business

In October 2011, we acquired Genworth's Medicare Supplement business and related blocks of in-force business for approximately $260 million.  The majority of the goodwill related to this acquisition will be assigned to our Health Care segment. The transaction closed after September 30, 2011, and therefore has not been reflected in these financial statements.

• PayFlex Holdings, Inc.

In October 2011, we acquired PayFlex, one of the nation’s largest independent account-based health plan administrators, for approximately $190 million.  All of the goodwill related to this acquisition will be assigned to our Health Care segment. The transaction closed after September 30, 2011, and therefore has not been reflected in these financial statements.

4. Earnings Per Common Share

Basic earnings per share (“EPS”) is computed by dividing net income by the weighted average number of common shares outstanding during the reporting period.  Diluted EPS is computed in a similar manner, except that the weighted average number of common shares outstanding is adjusted for the dilutive effects of our outstanding stock awards.

Page 7

The computations of basic and diluted EPS for the three and nine months ended September 30, 2011 and 2010 are as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(Millions, except per common share data)	2011		2010		2011		2010
Net income	$	490.4	$	497.6	$	1,613.1	$	1,551.2
Weighted average shares used to compute basic EPS	369.2		412.7		377.2		422.3
Dilutive effect of outstanding stock-based compensation awards (1)	7.6		6.1		7.8		7.2
Weighted average shares used to compute diluted EPS	376.8		418.8		385.0		429.5
Basic EPS	$	1.33	$	1.21	$	4.28	$	3.67
Diluted EPS	$	1.30	$	1.19	$	4.19	$	3.61

⁽¹⁾  Stock based compensation awards are not included in the calculation of diluted EPS if the exercise price is greater than the average market price of Aetna common shares during the period (i.e., the awards are anti-dilutive).  Approximately 12.6 million and 12.7 million stock appreciation rights were not included in the calculation of diluted EPS for the three and nine months ended September 30, 2011, respectively.  Approximately 18.6 million and 18.7 million stock appreciation rights and 5.7 million and 5.8 million stock options were not included in the calculation of diluted EPS for the three and nine months ended September 30, 2010, respectively. These stock based compensation awards were excluded from the calculation of diluted EPS because their effect was anti-dilutive.

5. Operating Expenses

For the three and nine months ended September 30, 2011 and 2010, selling expenses (which include broker commissions, the variable component of our internal sales force compensation and premium taxes) and general and administrative expenses were as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(Millions)	2011		2010		2011		2010
Selling expenses	$	269.1	$	304.8	$	827.0	$	928.8
General and administrative expenses:
Salaries and related benefits (1)	918.0		761.6		2,468.6		2,292.3
Other general and administrative expenses (2)	629.2		487.7		1,675.9		1,408.3
Total general and administrative expenses	1,547.2		1,249.3		4,144.5		3,700.6
Total operating expenses	$	1,816.3	$	1,554.1	$	4,971.5	$	4,629.4

⁽¹⁾  Includes a one-time pretax charge of $137.0 million in the three and nine months ended September 30, 2011 related to the voluntary early retirement program that we announced in July 2011. Refer to the reconciliation of operating earnings to net income in Note 15 beginning on page 29 for additional information.

⁽²⁾  Includes litigation-related insurance proceeds of $41.0 million and $131.0 million for the three and nine months ended September 30, 2010, respectively.  Refer to the reconciliation of operating earnings to net income in Note 15 beginning on page 29 for additional information.

Page 8

6. Goodwill and Other Acquired Intangible Assets

The increase in goodwill for the nine months ended September 30, 2011 and 2010 is as follows:

(Millions)	2011		2010
Balance, beginning of the period	$	5,146.4	$	5,146.2
Goodwill acquired:
Prodigy (1)	445.0		—
Medicity	393.5		—
Other (1)	25.4		(.5		)
Balance, end of the period	$	6,010.3	$	5,145.7

⁽¹⁾  Goodwill related to these acquisitions is considered preliminary, pending the final allocation of the applicable purchase price.

Other acquired intangible assets at September 30, 2011 and December 31, 2010 were comprised of the following:

(Millions)	Cost		Accumulated Amortization			Net Balance		Amortization Period (Years)
September 30, 2011
Provider networks	$	703.2		$	421.3	$	281.9		12-25	(1)
Customer lists	661.4			313.9		347.5			4-10	(1)
Technology	120.9			32.6		88.3			3-10
Other	21.8			16.9		4.9			2-15
Definite-lived trademarks	47.6			12.7		34.9			2-15
Indefinite-lived trademarks	22.3			—		22.3
Total other acquired intangible assets	$	1,577.2		$	797.4	$	779.8
December 31, 2010
Provider networks	$	703.2		$	398.9	$	304.3		12-25	(1)
Customer lists	420.4			262.6		157.8			4-10	(1)
Technology	25.3			25.0		.3			3-5
Other	17.1			16.8		.3			2-15
Definite-lived trademarks	21.0			10.5		10.5			2-15
Indefinite-lived trademarks	22.3			—		22.3
Total other acquired intangible assets	$	1,209.3		$	713.8	$	495.5

⁽¹⁾  The amortization period for our provider networks and customer lists includes an assumption of renewal or extension of these arrangements.  At September 30, 2011 and December 31, 2010, the periods prior to next renewal or extension for our provider networks primarily ranged from 1 to 3 years. At September 30, 2011 and December 31, 2010, the period prior to the next renewal or extension for our customer lists was approximately one year. Any costs related to the renewal or extension of these contracts is expensed as incurred.

The value assigned to other acquired intangible assets for acquisitions completed during the nine months ended September 30, 2011, primarily for customer lists and technology intangibles, totaled $367.9 million, of which $227.0 million is preliminary pending the finalization of purchase price allocations.

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We estimate annual pretax amortization for other acquired intangible assets for 2011 and over the next five years to be as follows:

(Millions)
2011	$	114.5
2012	115.7
2013	106.5
2014	87.4
2015	72.1
2016	68.2

7. Investments

Total investments at September 30, 2011 and December 31, 2010 were as follows:

	September 30, 2011						December 31, 2010
(Millions)	Current		Long-term		Total		Current		Long-term		Total
Debt and equity securities available for sale	$	1,986.2	$	14,785.5	$	16,771.7	$	2,111.9	$	14,849.7	$	16,961.6
Mortgage loans	49.0		1,556.8		1,605.8		55.2		1,454.6		1,509.8
Other investments	7.5		1,321.5		1,329.0		2.6		1,242.0		1,244.6
Total investments	$	2,042.7	$	17,663.8	$	19,706.5	$	2,169.7	$	17,546.3	$	19,716.0

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Debt and Equity Securities

Debt and equity securities available for sale at September 30, 2011 and December 31, 2010 were as follows:

(Millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses				Fair Value
September 30, 2011
Debt securities:
U.S. government securities	$	1,358.0	$	171.1	$	(.4	)		$	1,528.7
States, municipalities and political subdivisions	2,470.5		184.6		(4.9		)		2,650.2
U.S. corporate securities	6,268.4		671.5		(43.6		)		6,896.3
Foreign securities	2,664.0		259.7		(43.1		)		2,880.6
Residential mortgage-backed securities	811.3		51.8		(.1		)	(1)	863.0
Commercial mortgage-backed securities	1,269.4		80.1		(14.3		)	(1)	1,335.2
Other asset-backed securities	397.9		21.4		(4.1		)	(1)	415.2
Redeemable preferred securities	168.9		11.2		(14.8		)		165.3
Total debt securities	15,408.4		1,451.4		(125.3		)		16,734.5
Equity securities	40.2		5.0		(8.0		)		37.2
Total debt and equity securities (2)	$	15,448.6	$	1,456.4	$	(133.3	)		$	16,771.7
December 31, 2010
Debt securities:
U.S. government securities	$	1,293.5	$	80.8	$	(.6	)		$	1,373.7
States, municipalities and political subdivisions	2,288.8		54.4		(46.9		)		2,296.3
U.S. corporate securities	6,731.5		553.0		(21.9		)		7,262.6
Foreign securities	2,667.4		231.1		(21.2		)		2,877.3
Residential mortgage-backed securities	1,089.2		53.6		(2.8		)	(1)	1,140.0
Commercial mortgage-backed securities	1,226.4		99.5		(13.7		)	(1)	1,312.2
Other asset-backed securities	447.6		21.1		(4.8		)	(1)	463.9
Redeemable preferred securities	196.7		12.3		(12.7		)		196.3
Total debt securities	15,941.1		1,105.8		(124.6		)		16,922.3
Equity securities	35.3		5.6		(1.6		)		39.3
Total debt and equity securities (2)	$	15,976.4	$	1,111.4	$	(126.2	)		$	16,961.6

⁽¹⁾  At September 30, 2011 and December 31, 2010, we held securities for which we recognized $28.0 million and $38.3 million, respectively, of non-credit-related impairments in other comprehensive income in the past. These securities had a net unrealized capital gain at September 30, 2011 and December 31, 2010 of $8.2 million and $3.9 million, respectively.

⁽²⁾  Investment risks associated with our experience-rated and discontinued products generally do not impact our operating results (refer to Note 17 beginning on page 30 for additional information on our accounting for discontinued products).  At September 30, 2011, debt and equity securities with a fair value of $4.1 billion, gross unrealized capital gains of $483.4 million and gross unrealized capital losses of $55.7 million and, at December 31, 2010, debt and equity securities with a fair value of $4.1 billion, gross unrealized capital gains of $339.5 million and gross unrealized capital losses of $38.1 million were included in total debt and equity securities, but support our experience-rated and discontinued products.  Changes in net unrealized capital gains (losses) on these securities are not reflected in accumulated other comprehensive income.

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The fair value of debt securities at September 30, 2011 is shown below by contractual maturity.  Actual maturities may differ from contractual maturities because securities may be restructured, called or prepaid.

(Millions)	Fair Value
Due to mature:
Less than one year	$	694.5
One year through five years	3,018.1
After five years through ten years	5,213.8
Greater than ten years	5,194.7
Residential mortgage-backed securities	863.0
Commercial mortgage-backed securities	1,335.2
Other asset-backed securities	415.2
Total	$	16,734.5

Mortgage-Backed and Other Asset-Backed Securities

All of our residential mortgage-backed securities at September 30, 2011 were issued by the Government National Mortgage Association, the Federal National Mortgage Association or the Federal Home Loan Mortgage Corporation and carry agency guarantees and explicit or implicit guarantees by the U.S. Government.  At September 30, 2011, our residential mortgage-backed securities had an average quality rating of AAA and a weighted average duration of 1.9 years.

Our commercial mortgage-backed securities have underlying loans that are dispersed throughout the U.S.  Significant market observable inputs used to value these securities include probability of default and loss severity.  At September 30, 2011, these securities had an average quality rating of AA+ and a weighted average duration of 3.7 years.

Our other asset-backed securities have a variety of underlying collateral (e.g., automobile loans, credit card receivables and home equity loans).  Significant market observable inputs used to value these securities include the unemployment rate, loss severity and probability of default.  At September 30, 2011, these securities had an average quality rating of AA and a weighted average duration of 3.4 years.

Unrealized Capital Losses and Net Realized Capital Gains (Losses)

When a debt or equity security is in an unrealized capital loss position, we monitor the duration and severity of the loss to determine if sufficient market recovery can occur within a reasonable period of time.  We recognize an other-than-temporary impairment (“OTTI”) when we intend to sell a debt security that is in an unrealized capital loss position or if we determine a credit-related loss on a debt or equity security has occurred.

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Summarized below are the debt and equity securities we held at September 30, 2011 and December 31, 2010 that were in an unrealized capital loss position, aggregated by the length of time the investments have been in that position:

	Less than 12 months				Greater than 12 months				Total (1)
(Millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
September 30, 2011
Debt securities:
U.S. government securities	$	50.9	$	.1	$	15.1	$	.3	$	66.0	$	.4
States, municipalities and political subdivisions	90.8		1.0		93.4		3.9		184.2		4.9
U.S. corporate securities	947.2		40.7		74.1		2.9		1,021.3		43.6
Foreign securities	659.0		34.8		34.4		8.3		693.4		43.1
Residential mortgage-backed securities	—		—		3.1		.1		3.1		.1
Commercial mortgage-backed securities	263.9		9.0		43.2		5.3		307.1		14.3
Other asset-backed securities	5.7		.3		3.9		3.8		9.6		4.1
Redeemable preferred securities	38.5		1.7		35.5		13.1		74.0		14.8
Total debt securities	2,056.0		87.6		302.7		37.7		2,358.7		125.3
Equity securities	15.9		7.6		10.7		.4		26.6		8.0
Total debt and equity securities (1)	$	2,071.9	$	95.2	$	313.4	$	38.1	$	2,385.3	$	133.3
December 31, 2010
Debt securities:
U.S. government securities	$	8.4	$	.2	$	19.8	$	.4	$	28.2	$	.6
States, municipalities and political subdivisions	964.9		37.6		82.7		9.3		1,047.6		46.9
U.S. corporate securities	665.8		17.0		210.2		4.9		876.0		21.9
Foreign securities	375.9		14.6		34.6		6.6		410.5		21.2
Residential mortgage-backed securities	103.7		2.6		6.6		.2		110.3		2.8
Commercial mortgage-backed securities	103.7		2.4		78.5		11.3		182.2		13.7
Other asset-backed securities	85.9		2.0		4.9		2.8		90.8		4.8
Redeemable preferred securities	4.5		—		94.3		12.7		98.8		12.7
Total debt securities	2,312.8		76.4		531.6		48.2		2,844.4		124.6
Equity securities	.5		—		9.5		1.6		10.0		1.6
Total debt and equity securities (1)	$	2,313.3	$	76.4	$	541.1	$	49.8	$	2,854.4	$	126.2

⁽¹⁾  At September 30, 2011 and December 31, 2010, debt and equity securities in an unrealized capital loss position of $55.7 million and $38.1 million, respectively, and with related fair value of $612.0 million and $650.5 million, respectively, related to experience-rated and discontinued products.

We reviewed the securities in the tables above and concluded that these are performing assets generating investment income to support the needs of our business.  In performing this review, we considered factors such as the quality of the investment security based on research performed by our internal credit analysts and external rating agencies and the prospects of realizing the carrying value of the security based on the investment’s current prospects for recovery.  At September 30, 2011, we did not have the intention to sell the debt securities that were in an unrealized capital loss position.

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The maturity dates for debt securities in an unrealized capital loss position at September 30, 2011 were as follows:

	Supporting discontinued and experience-rated products				Supporting remaining products				Total
(Millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Due to mature:
Less than one year	$	1.0	$	—	$	139.8	$	2.4	$	140.8	$	2.4
One year through five years	54.7		1.6		331.5		9.6		386.2		11.2
After five years through ten years	258.4		12.6		672.5		28.1		930.9		40.7
Greater than ten years	215.5		30.8		365.5		21.7		581.0		52.5
Residential mortgage-backed securities	—		—		3.1		.1		3.1		.1
Commercial mortgage-backed securities	51.2		2.4		255.9		11.9		307.1		14.3
Other asset-backed securities	5.0		.3		4.6		3.8		9.6		4.1
Total	$	585.8	$	47.7	$	1,772.9	$	77.6	$	2,358.7	$	125.3

Net realized capital gains for the three and nine months ended September 30, 2011 and 2010, excluding amounts related to experience-rated contract holders and discontinued products, were as follows:

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
(Millions)	2011			2010			2011			2010
OTTI losses on debt securities	$	(3.7	)	$	(9.0	)	$	(8.2	)	$	(32.7	)
Portion of OTTI losses on debt securities recognized   in other comprehensive income	—			6.0			—			12.7
Net OTTI losses on debt securities recognized in earnings	(3.7		)	(3.0		)	(8.2		)	(20.0		)
Net realized capital gains, excluding OTTI losses on debt securities	82.3			82.6			147.9			219.7
Net realized capital gains	$	78.6		$	79.6		$	139.7		$	199.7

The net realized capital gains for the three and nine months ended September 30, 2011 and 2010 were primarily attributable to the sale of debt securities, partially offset by losses from derivative transactions.

Excluding amounts related to experience-rated and discontinued products, proceeds from the sale of debt securities and the related gross realized capital gains and losses for the three and nine months ended September 30, 2011 and 2010 were as follows:

	For the Three Months Ended						For the Nine Months Ended
	September 30,						September 30,
(Millions)	2011			2010			2011			2010
Proceeds on sales	$	1,927.1		$	2,373.3		$	5,019.0		$	5,938.3
Gross realized capital gains	107.5			108.8			216.7			304.2
Gross realized capital losses	(5.0		)	(6.4		)	(30.1		)	(26.4		)

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Mortgage loans

Our mortgage loans are collateralized by commercial real estate.  During the three and nine months ended September 30, 2011 and 2010 we had the following activity in our mortgage loan portfolio:

	For the Three Months Ended				For the Nine Months Ended
	September 30,				September 30,
(Millions)	2011		2010		2011		2010
New mortgage loans	$	56.1	$	37.9	$	184.6	$	53.2
Mortgage loans fully repaid	15.4		21.2		54.6		74.3
Mortgage loans foreclosed	—		8.5		—		20.0

At September 30, 2011 and December 31, 2010, we had no material problem, restructured or potential problem mortgage loans.  We also had no material impairment reserves on these loans at September 30, 2011 or December 31, 2010.

We assess our mortgage loans on a regular basis for credit impairments, and annually we assign a credit quality indicator to each loan.  Our credit quality indicator is internally developed and categorizes our portfolio on a scale from 1 to 7.  Category 1 represents loans of superior quality, and Categories 6 and 7 represent loans where collections are at risk.  Most of our mortgage loans fall into the Level 2 to 4 ratings.  These ratings represent loans where credit risk is minimal to acceptable; however, these loans may display some susceptibility to economic changes.  Category 5 represents loans where credit risk is not substantial but these loans warrant management’s close attention.  These indicators are based upon several factors, including current loan to value ratios, property condition, market trends, borrower quality and deal structure.  Based upon our most recent assessment at September 30, 2011 and December 31, 2010, our mortgage loans were given the following credit quality indicators:

(In Millions)	September 30, 2011		December 31, 2010
1	$	104.5	$	99.4
2 to 4	1,374.7		1,301.5
5	91.3		86.1
6 and 7	35.3		22.8
Total	$	1,605.8	$	1,509.8

Variable Interest Entities

In determining whether to consolidate a variable interest entity ("VIE"), we consider several factors including whether we have the power to direct activities, the obligation to absorb losses and the right to receive benefits that could potentially be significant to the VIE.  We have relationships with certain real estate and hedge fund partnerships that are considered VIEs, but are not consolidated.  We record the amount of our investment in these partnerships as long-term investments on our balance sheets and recognize our share of partnership income or losses in earnings.  Our maximum exposure to loss as a result of our investment in these partnerships is our investment balance at September 30, 2011 and December 31, 2010 of approximately $171 million and $153 million, respectively, and the risk of recapture of tax credits related to the real estate partnerships previously recognized, which we do not consider significant.  We do not have a future obligation to fund losses or debts on behalf of these investments; however, we may voluntarily contribute funds.  The real estate partnerships construct, own and manage low-income housing developments and had total assets of approximately $5.2 billion and $5.1 billion at September 30, 2011 and December 31, 2010, respectively.  The hedge fund partnerships had total assets of approximately $6.1 billion at both September 30, 2011 and December 31, 2010.

Non-controlling Interests

Certain of our investment holdings are partially-owned by third parties.  At September 30, 2011 and December 31, 2010, approximately $71 million and $74 million, respectively, of our investment holdings were owned by third parties.  The non-controlling entities’ share of these investments was included in accrued expenses and other current liabilities.  Net (loss) income attributable to these interests was $(1) million and $2 million for the three and nine months ended September 30, 2011, respectively, and $1 million and $2 million for the three and nine months ended

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September 30, 2010, respectively.  These non-controlling interests did not have a material impact on our financial position or operating results.

Net Investment Income

Sources of net investment income for the three and nine months ended September 30, 2011 and 2010 were as follows:

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
(Millions)	2011			2010			2011			2010
Debt securities	$	205.1		$	225.8		$	628.5		$	694.3
Mortgage loans	26.5			25.4			75.8			78.4
Other investments	9.5			4.4			45.4			25.5
Gross investment income	241.1			255.6			749.7			798.2
Less:  investment expenses	(7.5		)	(7.4		)	(22.2		)	(21.1		)
Net investment income (1)	$	233.6		$	248.2		$	727.5		$	777.1

⁽¹⁾  Investment risks associated with our experience-rated and discontinued products generally do not impact our operating results (refer to Note 17 beginning on page 30 for additional information on our accounting for discontinued products).  Net investment income includes $85.8 million and $252.8 million for the three and nine months ended September 30, 2011, respectively, and $78.3 million and $246.7 million for the three and nine months ended September 30, 2010, respectively, related to investments supporting our experience-rated and discontinued products.

The decrease in net investment income during the three and nine months ended September 30, 2011 was primarily a result of lower average yields and lower average asset levels partially offset by higher returns on our alternative investments.

8. Other Comprehensive (Loss) Income

Shareholders’ equity included the following activity in accumulated other comprehensive loss (excluding amounts related to experience-rated contract holders and discontinued products) for the nine months ended September 30, 2011 and 2010:

	Net Unrealized Gains (Losses)											Pension and OPEB Plans							Total Accumulated Other Comprehensive (Loss) Income
	Securities						Foreign Currency and Derivatives
(Millions)	Previously Impaired (1)			All Other							Unrecognized Net Actuarial Losses				Unrecognized Prior Service Cost
Nine months ended September 30, 2011
Balance at December 31, 2010	$	75.1		$	375.2			$	(27.3	)		$	(1,614.0	)		$	28.4			$	(1,162.6	)
Net unrealized gains (losses) ($376.6 pretax)	.7			251.9				(7.8		)		—				—				244.8
Reclassification to earnings ($128.6 pretax)	(16.8		)	(97.7		)		2.1				30.8				(2.0		)		(83.6		)
Other comprehensive (loss) income	(16.1		)	154.2				(5.7		)		30.8				(2.0		)		161.2
Balance at September 30, 2011	$	59.0		$	529.4			$	(33.0	)		$	(1,583.2	)		$	26.4			$	(1,001.4	)
Nine months ended September 30, 2010
Balance at December 31, 2009	$	100.3		$	235.7			$	25.3			$	(1,623.8	)		$	39.5			$	(1,223.0	)
Net unrealized gains (losses) ($5.7 pretax)	51.2			549.9				(53.8		)		(543.6		)		—				3.7
Reclassification to earnings ($149.1 pretax)	(67.5		)	(159.1		)		.5				94.3				(10.5		)		(142.3		)
Other comprehensive (loss) income	(16.3		)	390.8				(53.3		)		(449.3		)		(10.5		)		(138.6		)
Balance at September 30, 2010	$	84.0		$	626.5			$	(28.0	)		$	(2,073.1	)		$	29.0			$	(1,361.6	)

⁽¹⁾  Represents unrealized losses on the non-credit-related component of impaired debt securities that we do not intend to sell and subsequent appreciation in the fair value of those securities as well as those that we intend to sell.

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9. Financial Instruments

The preparation of our consolidated financial statements in accordance with GAAP requires certain of our assets and liabilities to be reflected at their fair value, and others on another basis, such as an adjusted historical cost basis.  In this note, we provide details on the fair value of financial assets and liabilities and how we determine those fair values.  We present this information for those financial instruments that are measured at fair value for which the change in fair value impacts net income or other comprehensive income separately from other financial assets and liabilities.

Financial Instruments Measured at Fair Value in our Balance Sheets

Certain of our financial instruments are measured at fair value in our balance sheets.  The fair values of these instruments are based on valuations that include inputs that can be classified within one of three levels of a hierarchy established by GAAP.  The following are the levels of the hierarchy and a brief description of the type of valuation information (“inputs”) that qualifies a financial asset or liability for each level:

◦ Level 1 – Unadjusted quoted prices for identical assets or liabilities in active markets.

◦ Level 2 – Inputs other than Level 1 that are based on observable market data.  These include: quoted prices for similar assets in active markets, quoted prices for identical assets in inactive markets, inputs that are observable that are not prices (such as interest rates and credit risks) and inputs that are derived from or corroborated by observable markets.

◦ Level 3 – Developed from unobservable data, reflecting our own assumptions.

Financial assets and liabilities are classified based upon the lowest level of input that is significant to the valuation.  When quoted prices in active markets for identical assets and liabilities are available, we use these quoted market prices to determine the fair value of financial assets and liabilities and classify these assets and liabilities as Level 1.  In other cases where a quoted market price for identical assets and liabilities in an active market is either not available or not observable, we estimate fair value using valuation methodologies based on available and observable market information or by using a matrix pricing model.  These financial assets and liabilities would then be classified as Level 2.  If quoted market prices are not available, we determine fair value using broker quotes or an internal analysis of each investment’s financial performance and cash flow projections.  Thus, financial assets and liabilities may be classified in Level 3 even though there may be some significant inputs that may be observable.

The following is a description of the valuation methodologies used for our financial assets and liabilities that are measured at fair value, including the general classification of such assets and liabilities pursuant to the valuation hierarchy.

Debt Securities – Where quoted prices are available in an active market, our debt securities are classified in Level 1 of the fair value hierarchy.  Our Level 1 debt securities are comprised primarily of U.S. Treasury securities.  If Level 1 valuations are not available, the fair value is determined using models such as matrix pricing, which use quoted market prices of debt securities with similar characteristics, or discounted cash flows to estimate fair value.  We obtained one price for each of our Level 2 debt securities and did not adjust any of these prices at September 30, 2011 or December 31, 2010.

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We also value certain debt securities using Level 3 inputs.  For Level 3 debt securities, fair values are determined by outside brokers or, in the case of certain private placement securities, are priced internally.  Outside brokers determine the value of these debt securities through a combination of their knowledge of the current pricing environment and market flows.  We obtained one non-binding broker quote for each of these Level 3 debt securities and did not adjust any of these quotes at September 30, 2011 or December 31, 2010.  The total fair value of our broker quoted securities was approximately $132 million at September 30, 2011 and $153 million at December 31, 2010.  Examples of these Level 3 debt securities include certain U.S. and foreign corporate securities and certain of our commercial mortgage-backed securities as well as other asset-backed securities.  For some of our private placement securities, our internal staff determines the value of these debt securities by analyzing spreads of corporate and sector indices as well as interest spreads of comparable public bonds.  Examples of these Level 3 debt securities include certain U.S. securities and certain tax-exempt municipal securities.

Equity Securities – We currently have two classifications of equity securities:  those that are publicly traded and those that are privately held.  Our publicly-traded securities are classified as Level 1 because quoted prices are available for these securities in an active market.  For privately-held equity securities, there is no active market; therefore, we classify these securities as Level 3 because we price these securities through an internal analysis of each investment’s financial statements and cash flow projections.

Derivatives – Our derivative instruments are valued using models that primarily use market observable inputs and therefore are classified as Level 2 because they are traded in markets where quoted market prices are not readily available.

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Financial assets and liabilities measured at fair value on a recurring basis in our balance sheets at September 30, 2011 and December 31, 2010 were as follows:

(Millions)	Level 1		Level 2		Level 3		Total
September 30, 2011
Assets:
Debt securities:
U.S. government securities	$	1,277.6	$	251.1	$	—	$	1,528.7
States, municipalities and political subdivisions	—		2,648.5		1.7		2,650.2
U.S. corporate securities	—		6,834.6		61.7		6,896.3
Foreign securities	—		2,825.8		54.8		2,880.6
Residential mortgage-backed securities	—		863.0		—		863.0
Commercial mortgage-backed securities	—		1,306.5		28.7		1,335.2
Other asset-backed securities	—		367.6		47.6		415.2
Redeemable preferred securities	—		138.5		26.8		165.3
Total debt securities	1,277.6		15,235.6		221.3		16,734.5
Equity securities	.8		—		36.4		37.2
Derivatives	—		7.5		—		7.5
Total	$	1,278.4	$	15,243.1	$	257.7	$	16,779.2
Liabilities:
Derivatives	$	—	$	4.2	$	—	$	4.2
December 31, 2010
Assets:
Debt securities:
U.S. government securities	$	1,081.0	$	292.7	$	—	$	1,373.7
States, municipalities and political subdivisions	—		2,292.7		3.6		2,296.3
U.S. corporate securities	—		7,201.9		60.7		7,262.6
Foreign securities	—		2,822.4		54.9		2,877.3
Residential mortgage-backed securities	—		1,140.0		—		1,140.0
Commercial mortgage-backed securities	—		1,275.3		36.9		1,312.2
Other asset-backed securities	—		407.4		56.5		463.9
Redeemable preferred securities	—		178.5		17.8		196.3
Total debt securities	1,081.0		15,610.9		230.4		16,922.3
Equity securities	1.4		—		37.9		39.3
Derivatives	—		2.6		—		2.6
Total	$	1,082.4	$	15,613.5	$	268.3	$	16,964.2
Liabilities:
Derivatives	$	—	$	6.5	$	—	$	6.5

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The change in the balance of Level 3 financial assets for the three and nine months ended September 30, 2011 is as follows:

(Millions)	Foreign Securities				Commercial Mortgage-backed Securities			Equity Securities			Other				Total
Three Months Ended September 30, 2011
Beginning balance	$	50.1			$	39.8		$	33.2		$	130.0			$	253.1
Net realized and unrealized capital gains (losses):
Included in earnings	.1				1.1			—			(.6		)		.6
Included in other comprehensive income	(1.5		)		(2.2		)	—			1.0				(2.7		)
Other (1)	(1.1		)		—			(1.8		)	(3.8		)		(6.7		)
Purchases	7.2				—			5.3			12.1				24.6
Sales	—				—			(.3		)	(6.3		)		(6.6		)
Settlements	—				(10.0		)	—			(5.7		)		(15.7		)
Transfers into Level 3	—				—			—			11.1			(2)	11.1
Ending balance	$	54.8			$	28.7		$	36.4		$	137.8			$	257.7
Amount of Level 3 net unrealized losses
included in net income	$	—			$	—		$	—		$	—			$	—
(Millions)	Foreign Securities				Commercial Mortgage-backed Securities			Equity Securities			Other				Total
Nine Months Ended September 30, 2011
Beginning balance	$	54.9			$	36.9		$	37.9		$	138.6			$	268.3
Net realized and unrealized capital gains (losses):
Included in earnings	1.1				2.6			—			(2.2		)		1.5
Included in other comprehensive income	(2.0		)		.8			—			1.2				—
Other (1)	(.4		)		—			(6.7		)	(3.8		)		(10.9		)
Purchases	27.4				—			5.5			22.7				55.6
Sales	(16.4		)		—			(.3		)	(10.0		)		(26.7		)
Settlements	(.8		)		(11.6		)	—			(19.8		)		(32.2		)
Transfers (out of) into Level 3	(9.0		)	(2)	—			—			11.1			(2)	2.1
Ending balance	$	54.8			$	28.7		$	36.4		$	137.8			$	257.7
Amount of Level 3 net unrealized losses
included in net income	$	—			$	—		$	—		$	(.2	)		$	(.2	)

⁽¹⁾  Reflects realized and unrealized capital gains and losses on investments supporting our experience-rated and discontinued products, which do not impact our operating results.

⁽²⁾  Amounts represent gross transfers (out of) into Level 3.

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The change in the balance of Level 3 financial assets for the three and nine months ended September 30, 2010 was as follows:

	Three Months Ended													Nine Months Ended
	September 30, 2010													September 30, 2010
(Millions)	U.S.  Corporate  Securities			Foreign  Securities				Other			Total			U.S. Corporate  Securities			Foreign  Securities				Other			Total
Beginning balance	$	85.1			$	50.9		$	169.1		$	305.1		$	75.3			$	199.0		$	209.2		$	483.5
Net realized and unrealized gains (losses):
Included in earnings	(.1		)		1.5			.3			1.7			(.4		)		8.2			4.7			12.5
Included in other comprehensive income	(.9		)		.4			13.8			13.3			(1.7		)		(3.2		)	25.2			20.3
Other (1)	—				.8			1.8			2.6			(.2		)		1.8			(3.7		)	(2.1		)
Purchases, sales and maturities	3.3				(7.0		)	(1.8		)	(5.5		)	(11.3		)		(92.0		)	(56.1		)	(159.4		)
Transfers out of Level 3	(27.1		)		(4.8		)	(12.1		)	(44.0		)	(1.4		)		(72.0		)	(8.2		)	(81.6		)
Ending balance	$	60.3			$	41.8		$	171.1		$	273.2		$	60.3			$	41.8		$	171.1		$	273.2
Amount of Level 3 net unrealized losses included in net income	$	—			$	—		$	(.4	)	$	(.4	)	$	—			$	—		$	(.4	)	$	(.4	)

⁽¹⁾  Reflects realized and unrealized capital gains and losses on investments supporting our experience-rated and discontinued products, which do not impact our operating results.

There were no material transfers into Level 3 during the three and nine months ended September 30, 2010. During 2010, certain investments previously classified as Level 3 were reclassified to Level 2 because we were able to obtain observable market data.

Financial Instruments Not Measured at Fair Value in our Balance Sheets

The following is a description of the valuation methodologies used for estimating the fair value of our financial assets and liabilities that are carried on our balance sheets at adjusted cost or contract value.

Mortgage loans: Fair values are estimated by discounting expected mortgage loan cash flows at market rates that reflect the rates at which similar loans would be made to similar borrowers.  These rates reflect our assessment of the credit quality and the remaining duration of the loans.  The fair value estimates of mortgage loans of lower credit quality, including problem and restructured loans, are based on the estimated fair value of the underlying collateral.

Investment contract liabilities:

•With a fixed maturity:  Fair value is estimated by discounting cash flows at interest rates currently

being offered by, or available to, us for similar contracts.

•Without a fixed maturity:  Fair value is estimated as the amount payable to the contract holder upon

demand.  However, we have the right under such contracts to delay payment of withdrawals that

may ultimately result in paying an amount different than that determined to be payable on demand.

Long-term debt:  Fair values are based on quoted market prices for the same or similar issued debt or, if no quoted market prices are available, on the current rates estimated to be available to us for debt of similar terms and remaining maturities.

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The carrying value and estimated fair value of certain of our financial instruments at September 30, 2011 and December 31, 2010 were as follows:

	September 30, 2011				December 31, 2010
(Millions)	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Assets:
Mortgage loans	$	1,605.8	$	1,650.5	$	1,509.8	$	1,526.1
Liabilities:
Investment contract liabilities:
With a fixed maturity	37.4		37.7		41.7		42.7
Without a fixed maturity	533.6		553.9		511.5		510.9
Long-term debt	3,977.1		4,683.5		4,382.5		4,728.9

Separate Accounts Measured at Fair Value in our Balance Sheets

Separate Accounts assets in our Large Case Pensions business represent funds maintained to meet specific objectives of contract holders.  Since contract holders bear the investment risk of these assets, a corresponding Separate Accounts liability has been established equal to the assets.  These assets and liabilities are carried at fair value.  Net investment income and capital gains and losses accrue directly to such contract holders.  The assets of each account are legally segregated and are not subject to claims arising from our other businesses.  Deposits, withdrawals, net investment income and realized and unrealized capital gains and losses on Separate Accounts assets are not reflected in our statements of income, shareholders’ equity or cash flows.

Separate Accounts assets include debt and equity securities and derivative instruments.  The valuation methodologies used for these assets are similar to the methodologies described beginning on page 17.  Separate Accounts real estate assets were transitioned out of our business in the second quarter of 2010.  The following is a description of the valuation methodology used to price our real estate investments that are carried at fair value, including the general classification pursuant to the valuation hierarchy.

Real Estate – The values of the underlying real estate investments are estimated using generally accepted valuation techniques and give consideration to the investment structure.  An appraisal of the underlying real estate for each of these investments is performed annually.  In the quarters in which an investment is not appraised or its valuation is not updated, fair value is based on available market information.  The valuation of a real estate investment is adjusted only if there has been a significant change in economic circumstances related to the investment since acquisition or the most recent independent valuation and upon the appraiser’s review and concurrence with the valuation.  Further, these valuations have been prepared giving consideration to the income, cost and sales comparison approaches of estimating property value.  These valuations do not necessarily represent the prices at which the real estate investments would sell, since market prices of real estate investments can only be determined by negotiation between a willing buyer and seller.  Therefore, these investment values are classified as Level 3.

Separate Accounts financial assets at September 30, 2011 and December 31, 2010 were as follows:

	September 30, 2011										December 31, 2010
(Millions)	Level 1		Level 2			Level 3		Total			Level 1		Level 2		Level 3		Total
Debt securities	$	1,264.2	$	2,627.3		$	.1	$	3,891.6		$	1,059.7	$	2,524.9	$	56.0	$	3,640.6
Equity securities	839.3		—			—		839.3			1,231.9		—		—		1,231.9
Derivatives	—		(4.7		)	—		(4.7		)	—		.2		—		.2
Total (1)	$	2,103.5	$	2,622.6		$	.1	$	4,726.2		$	2,291.6	$	2,525.1	$	56.0	$	4,872.7

⁽¹⁾  Excludes $432.9 million and $422.6 million of cash and cash equivalents and other receivables at September 30, 2011 and December 31, 2010, respectively.

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The change in the balance of Level 3 Separate Accounts financial assets for the three and nine months ended September 30, 2011 and 2010 was as follows:

	Three Months Ended			Nine Months Ended
	September 30, 2011			September 30, 2011
(Millions)	Debt Securities			Debt Securities
Beginning balance	$	39.0		$	56.0
Total losses accrued to contract holders	—			(15.6		)
Purchases, sales and settlements	(38.2		)	(39.1		)
Transfers out of Level 3	(.7		)	(1.2		)
Ending balance	$	.1		$	.1

	Three Months Ended			Nine Months Ended
	September 30, 2010			September 30, 2010
(Millions)	Debt Securities			Debt Securities			Real Estate			Total
Beginning balance	$	87.7		$	97.3		$	71.4		$	168.7
Total (losses) gains accrued to contract holders	(13.2		)	(43.8		)	5.2			(38.6		)
Purchases, sales and maturities	3.1			21.1			.2			21.3
Transfers out of Level 3  (1)	(3.7		)	(.7		)	(76.8		)	(77.5		)
Ending balance	$	73.9		$	73.9		$	—		$	73.9

⁽¹⁾  The transfers out of Level 3 for 2010 primarily represent real estate Separate Account assets that were transitioned out of our business in the second quarter of 2010.

10. Pension and Other Postretirement Plans

Defined Benefit Retirement Plans

Components of the net periodic benefit (income) cost of our tax-qualified noncontributory defined benefit pension plans and other postretirement benefit (“OPEB”) plans for the three and nine months ended September 30, 2011 and 2010 were as follows:

	Pension Plans												OPEB Plans
	Three Months Ended						Nine Months Ended						Three Months Ended						Nine Months Ended
	September 30,						September 30,						September 30,						September 30,
(Millions)	2011			2010			2011			2010			2011			2010			2011			2010
Operating component:
Service cost	$	—		$	16.4		$	—		$	47.1		$	—		$	.1		$	.1		$	.2
Amortization of prior service cost	(.1		)	(.4		)	(.3		)	(1.5		)	(1.0		)	(1.0		)	(2.8		)	(2.8		)
Curtailment gain	—			(11.9		)	—			(11.9		)	—			—			—			—
Total operating component (1)	(.1		)	4.1			(.3		)	33.7			(1.0		)	(.9		)	(2.7		)	(2.6		)
Financing component:
Interest cost	78.0			74.9			234.2			228.2			4.2			4.5			12.5			13.4
Expected return on plan assets	(95.9		)	(87.8		)	(287.8		)	(264.3		)	(.9		)	(.9		)	(2.7		)	(2.7		)
Recognized net actuarial losses	14.6			40.9			43.8			141.4			1.3			1.1			3.7			3.4
Total financing component (1)	(3.3		)	28.0			(9.8		)	105.3			4.6			4.7			13.5			14.1
Net periodic benefit (income) cost	$	(3.4	)	$	32.1		$	(10.1	)	$	139.0		$	3.6		$	3.8		$	10.8		$	11.5

⁽¹⁾  The operating component of this expense is allocated to our business segments and the financing component is allocated to our Corporate Financing segment.  Our Corporate Financing segment is not a business segment but is added to our business segments to reconcile to our consolidated results.  Refer to Note 15 beginning on page 29 for additional information on our business segments.

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On August 31, 2010, we announced that pension eligible employees would no longer earn future pension service credits in our tax-qualified noncontributory defined benefit pension plan (the "Aetna Pension Plan") effective December 31, 2010. The Aetna Pension Plan will continue to operate and account balances will continue to earn annual interest credits.

This announced change required a re-measurement of the Aetna Pension Plan's obligations and plan assets as of August 31, 2010. As a result of this re-measurement, our pension obligation increased by approximately $743 million (due primarily to a lower discount rate), accumulated other comprehensive income decreased by approximately $836 million ($543 million after tax), and the fair value of plan assets increased by approximately $156 million. In performing this re-measurement, we used a discount rate of 4.77%, consistent with our methodology for determining the discount rate using a yield curve, and an expected long-term rate of return of 7.5%. Additionally, as a result of this re-measurement, we revised the amortization period we use for actuarial gains and losses from 9 years to 31 years, reflecting the estimated average remaining participation period for current participants.

These actions also resulted in $12 million of one-time curtailment gains in the third quarter of 2010 and lower pension cost for the three and nine months ended September 30, 2011 compared to the corresponding periods in 2010.

In addition, during the third quarters of 2011 and 2010, we made $60 million and $505 million, respectively, in voluntary cash contributions to the Aetna Pension Plan.

11. Debt

The carrying value of our long-term debt at September 30, 2011 and December 31, 2010 was as follows:

(Millions)	September 30, 2011		December 31, 2010
Senior notes, 5.75%, due 2011 (1)	$	—	$	450.0
Senior notes, 7.875%, due 2011 (1)	—		449.9
Senior notes, 6.0%, due 2016	747.9		747.6
Senior notes, 6.5%, due 2018	499.0		498.9
Senior notes, 3.95%, due 2020	742.4		741.7
Senior notes, 4.125%, due 2021	493.3		—
Senior notes, 6.625%, due 2036	798.7		798.7
Senior notes, 6.75%, due 2037	695.8		695.7
Total long-term debt	3,977.1		4,382.5

⁽¹⁾  The 5.75% senior notes and the 7.875% senior notes were repaid in June 2011 and March 2011, respectively. These were classified as current in the consolidated balance sheet as of December 31, 2010.

In the three and nine months ended September 30, 2011, we entered into two interest rate swaps with an aggregate notional value of $250 million. We designated these swaps as cash flow hedges against interest rate exposure related to the forecasted future issuance of fixed-rate debt. At September 30, 2011, these interest rate swaps had an aggregate fair market value loss of $3 million, which was reflected in accumulated other comprehensive income.

Page 24

In May 2011, we issued $500 million of 4.125% senior notes due 2021 (the “2011 senior notes”) in anticipation of the scheduled maturity of our 5.75% senior notes due June 2011.  In the first half of 2011, prior to issuing the 2011 senior notes, we entered into two interest rate swaps with an aggregate notional value of $250 million and designated those interest rate swaps as a hedge against interest rate exposure related to the forecast issuance of that fixed-rate debt.  We terminated the swaps concurrently with issuing the 2011 senior notes and upon termination of the swaps, paid $9 million to the swap counterparty.  The related $9 million loss is recorded in accumulated other comprehensive income and is being amortized as interest expense over the ten-year life of the 2011 senior notes.

At September 30, 2011, we had approximately $450 million of commercial paper outstanding with a weighted average interest rate of .38%.  At December 31, 2010, we did not have any commercial paper outstanding.

At September 30, 2011, we had an unsecured $1.5 billion revolving credit agreement (the “Facility”) with several financial institutions which terminates in March 2013.  The Facility provides for the issuance of up to $200 million of letters of credit at our request, which count as usage of the available commitments under the Facility.  Upon our agreement with one or more financial institutions, we may expand the aggregate commitments under the Facility to a maximum of $2.0 billion. Various interest rate options are available under the Facility.  Any revolving borrowings mature on the termination date of the Facility.  We pay facility fees on the Facility ranging from .045% to .175% per annum, depending upon our long-term senior unsecured debt rating.  The facility fee was .06% at September 30, 2011.  The Facility contains a financial covenant that requires us to maintain a ratio of total debt to consolidated capitalization as of the end of each fiscal quarter at or below .5 to 1.0.  For this purpose, consolidated capitalization equals the sum of total shareholders’ equity, excluding any overfunded or underfunded status of our pension and OPEB plans and any net unrealized capital gains and losses, and total debt (as defined in the Facility).  We met this requirement at September 30, 2011.  There were no amounts outstanding under the Facility at any time during the three or nine months ended September 30, 2011.

12. Capital Stock

Our Board of Directors (our "Board") authorized three separate share repurchase programs on December 3, 2010, May 20, 2011 and September 23, 2011, respectively. Each repurchase program authorized us to repurchase up to $750 million of our common stock.  During the nine months ended September 30, 2011, we repurchased approximately 31 million shares of common stock at a cost of approximately $1.2 billion.  At September 30, 2011, we had remaining authorization to repurchase an aggregate of up to approximately $1 billion of common stock under the May 20, 2011 and September 23, 2011 programs.

In February 2011, we announced that our Board increased our cash dividend to shareholders to $.15 per share and moved us to a quarterly dividend payment cycle.  Prior to February 2011, our policy had been to pay an annual dividend of $.04 per share.

During the nine months ended September 30, 2011 our Board declared the following cash dividends:

Date Declared	Dividend Amount Per Share		Stockholders of Record Date	Date Paid/ To be Paid	Total Dividends (Millions)
February 3, 2011	$	.15	April 14, 2011	April 29, 2011	$	57.0
May 20, 2011	.15		July 14, 2011	July 29, 2011	55.9
September 23, 2011	.15		October 13, 2011	October 28, 2011	54.3

Declaration and payment of future dividends is at the discretion of our Board and may be adjusted as business needs or market conditions change.

Page 25

On February 7, 2011, approximately .6 million performance stock units (“PSUs”), 1.2 million market stock units (“MSUs”) and 1.0 million restricted stock units (“RSUs”) were granted to certain employees.  The number of vested PSUs (which could range from zero to 200% of the original number of units granted) is dependent upon the degree to which we achieve performance goals during the performance period as determined by our Board’s Committee on Compensation and Organization.  The performance period for the PSUs ends on December 31, 2011, and the vesting period ends on December 7, 2012.   The number of vested MSUs (which could range from zero to 150% of the original number of units granted) is based on the change between the closing price of our common stock on the grant date and the weighted average closing price of our common stock for the thirty trading days prior to the vesting date.  The MSUs have a twenty-two month vesting period.  Each vested PSU, MSU and RSU represents one share of common stock and will be paid in shares of common stock, net of taxes, at the end of the vesting period.  The RSUs will become 100% vested approximately three years from the grant date, with one-third vesting each December.

13. Dividend Restrictions and Statutory Surplus

Under regulatory requirements at September 30, 2011, the amount of dividends that may be paid through the end of 2011 by our insurance and HMO subsidiaries without prior approval by regulatory authorities is approximately $372 million in the aggregate.  There are no such restrictions on distributions from Aetna to its shareholders.  In the third quarter of 2011, our insurance and HMO subsidiaries paid approximately $1.1 billion of dividends to the Company.

The combined statutory capital and surplus of our insurance and HMO subsidiaries was $6.5 billion and $6.2 billion at September 30, 2011 and December 31, 2010, respectively.

14. Commitments and Contingencies

Guaranty Fund Assessments

Under guaranty fund laws existing in all states, insurers doing business in those states can be assessed (up to prescribed limits) for certain obligations of insolvent insurance companies to policyholders and claimants. The health insurance guaranty associations in which we participate that operate under these laws respond to insolvencies of long-term care insurers as well as health insurers.  Our assessments generally are based on a formula relating to our premiums in the state compared to the premiums of other insurers. Certain states allow assessments to be recovered as offsets to premium taxes.  Some states have similar laws relating to HMOs.  The Pennsylvania Insurance Commissioner has placed long-term care insurer Penn Treaty Network America Insurance Company and one of its subsidiaries (collectively, “Penn Treaty”) in rehabilitation, an intermediate action before insolvency, and has petitioned a state court for liquidation.  We cannot predict when a decision will be made, although we believe it is likely that the state court will rule within the next twelve months.  If Penn Treaty is declared insolvent and placed in liquidation, we and other insurers likely would be assessed over a period of years by guaranty associations for the payments the guaranty associations are required to make to Penn Treaty policyholders.  We are currently unable to predict the ultimate outcome of, or reasonably estimate the loss or range of losses resulting from, this potential insolvency because we cannot predict when the state court will render a decision, the amount of the insolvency, if any, the amount and timing of associated guaranty association assessments or the amount or availability of potential

offsets, such as premium tax offsets.  It is reasonably possible that in future reporting periods we may record a liability and expense relating to Penn Treaty or other insolvencies which could have a material adverse effect on our operating results, financial position and cash flows.  While we have historically recovered more than half of guaranty fund assessments through statutorily permitted premium tax offsets, significant increases in assessments could jeopardize future recovery of these assessments as regulatory actions may limit future offsets.

Litigation and Regulatory Proceedings

Out-of-Network Benefit Proceedings

We are named as a defendant in several purported class actions and individual lawsuits arising out of our practices related to the payment of claims for services rendered to our members by health care providers with whom we do not have a contract (“out-of-network providers”).   Among other things, these lawsuits allege that we paid too little to our health plan members and/or providers for these services, among other reasons, because of our use of data

Page 26

provided by Ingenix, Inc., a subsidiary of one of our competitors (“Ingenix”). Other major health insurers are the subject of similar litigation or have settled similar litigation.  

Various plaintiffs who are health care providers or medical associations seek to represent nationwide classes of out-of-network providers who provided services to our members during the period from 2001 to the present.  Various plaintiffs who are members in our health plans seek to represent nationwide classes of our members who received services from out-of-network providers during the period from 2001 to the present.  Taken together, these lawsuits allege that we violated state law, the Employee Retirement Income Security Act of 1974, as amended (“ERISA”), the Racketeer Influenced and Corrupt Organizations Act and federal antitrust laws, either acting alone or in concert with our competitors.  The purported classes seek reimbursement of all unpaid benefits, recalculation and repayment of deductible and coinsurance amounts, unspecified damages and treble damages, statutory penalties, injunctive and declaratory relief, plus interest, costs and attorneys’ fees, and seek to disqualify us from acting as a fiduciary of any benefit plan that is subject to ERISA.  Individual lawsuits that generally contain similar allegations and seek similar relief have been brought by health plan members and out-of-network providers.

The first class action case was commenced on July 30, 2007.  The federal Judicial Panel on Multi-District Litigation (the “MDL Panel”) has consolidated these class action cases in the U.S. District Court for the District of New Jersey (the “New Jersey District Court”) under the caption In re: Aetna UCR Litigation, MDL No. 2020 (“MDL 2020”).   In addition, the MDL Panel has transferred the individual lawsuits to MDL 2020.  On May 9, 2011, the New Jersey District Court dismissed the physician plaintiffs from MDL 2020 without prejudice.  The New Jersey District Court’s action followed a ruling by the United States District Court for the Southern District of Florida (the “Florida District Court”) that the physician plaintiffs were enjoined from participating in MDL 2020 due to a prior settlement and release.  The physician plaintiffs have attempted to appeal the Florida District Court’s ruling to the United States Court of Appeals for the Eleventh Circuit.

Discovery is substantially complete in MDL 2020, several motions are pending, and briefing on class certification has been completed.  The court has not set a trial date or a timetable for deciding class certification.  We intend to vigorously defend ourselves against the claims brought in these cases.

We also have received subpoenas and/or requests for documents and other information from, and been investigated by, attorneys general and other state and/or federal regulators, legislators and agencies relating to our out-of-network benefit payment practices.  It is reasonably possible that others could initiate additional litigation or additional regulatory action against us with respect to our out-of-network benefit payment practices.

CMS Actions

On June 13, 2011, the Centers for Medicare & Medicaid Services (“CMS”) lifted the intermediate sanctions it had previously imposed on us that required us to suspend the enrollment of and marketing to new members of all Aetna Medicare Advantage and Standalone Prescription Drug Plan (“PDP”) contracts.  The sanctions related to our compliance with certain Medicare Part D requirements.  We have resumed marketing our Medicare Advantage and PDP products and are enrolling beneficiaries with effective dates on and after July 1, 2011.  CMS still is not assigning any new low income subsidy members to our PDPs at this time.  However, low income subsidy members can make their own choice to enroll in Aetna products during the upcoming annual enrollment period.  As a result of these sanctions, our 2011 Medicare membership and operating results have been adversely affected because we did not participate in the 2010 open enrollment for individual 2011 Medicare plans, which occurred between November 15, 2010 and December 31, 2010.  We continue to cooperate fully with CMS to address residual matters identified in connection with the sanction review.

CMS regularly audits our performance to determine our compliance with CMS’s regulations, our contracts with CMS and the quality of services we provide to our Medicare members.  CMS uses various payment mechanisms to allocate and adjust premium payments to our and other companies’ Medicare plans by considering the applicable health status of Medicare members as supported by information maintained and provided by health care providers.  We collect claim and encounter data from providers and generally rely on providers to appropriately code their submissions and document their medical records.  Medicare Advantage plans and PDPs receive increased premiums for members who have certain medical conditions identified with specific health condition

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codes.  Federal regulators review and audit the providers’ medical records and related health condition codes that determine the members’ health status and the resulting premium payments to us.  CMS has instituted risk adjustment data validation (“RADV”) audits of various Medicare Advantage plans, including two of Aetna’s contracts for the 2007 contract year.  Although these two audits are ongoing, we do not believe that they will have a material impact on our operating results, financial position or cash flows.

We believe that the Office of the Inspector General (the “OIG”) also is auditing risk adjustment data, and we expect CMS and the OIG to continue auditing risk adjustment data for the 2007 contract year and beyond.  Aetna and other Medicare Advantage organizations have provided comments to CMS in response to CMS’s December 2010 proposed RADV sampling and payment error calculation methodology by which CMS proposes to calculate and extrapolate RADV audit payment error rates for, and determine premium refunds payable by, Medicare Advantage plans.  Our concerns with CMS’s proposed methodology include the fact that the proposed methodology does not take into account the “error rate” in the original Medicare fee-for-service data that was used to develop the risk adjustment system and that retroactive audit and payment adjustments undermine the actuarial soundness of Medicare Advantage bids.  CMS has indicated that it may make retroactive contract-level premium payment adjustments based on the results of these RADV audits, which could occur as early as the fourth quarter of 2011.  CMS’s premium adjustments could be implemented prior to our, or other Medicare Advantage plans, having an opportunity to appeal the audit or payment error calculation results or methodology.  We are unable to predict the ultimate outcome of CMS’s final RADV audit methodology, other audits for the 2007 contract year or subsequent contract years, the amounts of any retroactive refunds of, or prospective adjustments to, premium payments made to us, or whether any audit findings would cause a change to our method of estimating future premium revenue in bid submissions to CMS for the current or future contract years or compromise premium assumptions made in our bids for prior contract years.  Any premium refunds or adjustments resulting from regulatory audits, including those resulting from CMS’s selection of its final RADV audit methodology, whether as a result of RADV or other audits by CMS or OIG or otherwise, could be material and could adversely affect our operating results, financial position and cash flows.

Other Litigation and Regulatory Proceedings

We are involved in numerous other lawsuits arising, for the most part, in the ordinary course of our business operations, including employment litigation and claims of bad faith, medical malpractice, non-compliance with state and federal regulatory regimes, marketing misconduct, failure to timely or appropriately pay medical and/or group insurance claims (including post-payment audit and collection practices), rescission of insurance coverage, improper disclosure of personal information, patent infringement and other intellectual property litigation and other litigation in our Health Care and Group Insurance businesses.  Some of these other lawsuits are or are purported to be class actions.  We intend to vigorously defend ourselves against the claims brought in these matters.

In addition, our operations, current and past business practices, current and past contracts, and accounts and other books and records are subject to routine, regular and special investigations, audits, examinations and reviews by, and from time to time we receive subpoenas and other requests for information from, CMS, various state insurance and health care regulatory authorities, state attorneys general, the Center for Consumer Information and Insurance Oversight, the Office of the Inspector General, the Office of Personnel Management, committees, subcommittees and members of the U.S. Congress, the U.S. Department of Justice, U.S. attorneys and other state and federal governmental authorities.  These government actions include inquiries by, and testimony before, certain members, committees and subcommittees of the U.S. Congress regarding certain of our current and past business practices, including our overall claims processing and payment practices, our business practices with respect to our small group products, student health products or individual customers (such as market withdrawals, rating information, premium increases and medical benefit ratios), executive compensation matters and travel and entertainment expenses, as well as the investigations by, and subpoenas and requests from, attorneys general and others described above under “Out-of-Network Benefit Proceedings.”  There also continues to be heightened review by regulatory authorities of and increased litigation regarding the health and related benefits industry’s business and reporting practices, including premium rate increases, utilization management, complaint and grievance processing, information privacy, provider network structure (including the use of performance-based networks), delegated arrangements, rescission of insurance coverage, limited benefit health products, student health products, pharmacy

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benefit management practices and claim payment practices (including payments to out-of-network providers and payments on life insurance policies).  As a leading national health and related benefits company, we regularly are the subject of such government actions.  These government actions may prevent or delay us from implementing planned premium rate increases and may result, and have resulted, in restrictions on our business, changes to or clarifications of our business practices, retroactive adjustments to premiums, refunds or other payments to members, beneficiaries or states, assessments of damages, civil or criminal fines or penalties, or other sanctions, including the possible loss of licensure or suspension or exclusion from participation in government programs, such as the intermediate sanctions previously imposed on us by CMS that are described above under “CMS Actions.”

Estimating the probable losses or a range of probable losses resulting from litigation, government actions and other legal proceedings is inherently difficult and requires an extensive degree of judgment, particularly where the matters involve indeterminate claims for monetary damages, may involve fines, penalties or punitive damages that are discretionary in amount, involve a large number of claimants or regulatory authorities, represent a change in regulatory policy, present novel legal theories, are in the early stages of the proceedings, are subject to appeal or could result in a change in business practices.  In addition, because most legal proceedings are resolved over long periods of time, potential losses are subject to change due to, among other things, new developments, changes in litigation strategy, the outcome of intermediate procedural and substantive rulings and other parties’ settlement posture and their evaluation of the strength or weakness of their case against us.  Except as specifically noted above under “CMS Actions” with respect to the two ongoing RADV audits for the 2007 contract year, we are currently unable to predict the ultimate outcome of, or reasonably estimate the losses or a range of losses resulting from, the matters described above, and it is reasonably possible that their outcome could be material to us.

15. Segment Information

Our operations are conducted in three business segments:  Health Care, Group Insurance and Large Case Pensions.  Our Corporate Financing segment is not a business segment; it is added to our business segments in order to reconcile to our consolidated results.  The Corporate Financing segment includes interest expense on our outstanding debt and the financing components of our pension and OPEB plan expense (the service cost components of this expense are allocated to our business segments).

Summarized financial information of our segments for the three and nine months ended September 30, 2011 and 2010 was as follows:

(Millions)	Health Care		Group Insurance		Large Case Pensions		Corporate Financing			Total Company
Three Months Ended September 30, 2011
Revenue from external customers	$	7,695.9	$	426.6	$	40.6	$	—		$	8,163.1
Operating earnings (loss) (1)	525.7		37.9		4.4		(39.6		)	528.4
Three Months Ended September 30, 2010
Revenue from external customers	$	7,733.3	$	436.2	$	41.5	$	—		$	8,211.0
Operating earnings (loss) (1)	442.2		34.6		5.6		(62.8		)	419.6
Nine Months Ended September 30, 2011
Revenue from external customers	$	22,919.1	$	1,288.1	$	133.1	$	—		$	24,340.3
Operating earnings (loss) (1)	1,593.9		125.2		16.4		(124.1		)	1,611.4
Nine Months Ended September 30, 2010
Revenue from external customers	$	23,258.1	$	1,345.5	$	125.7	$	—		$	24,729.3
Operating earnings (loss) (1)	1,369.7		107.5		21.4		(198.2		)	1,300.4

⁽¹⁾  Operating earnings (loss) excludes net realized capital gains or losses and the other items described in the reconciliation on page 30.

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A reconciliation of operating earnings ⁽¹⁾ to net income for the three and nine months ended September 30, 2011 and 2010 was as follows:

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
(Millions)	2011			2010		2011			2010
Operating earnings	$	528.4		$	419.6	$	1,611.4		$	1,300.4
Voluntary early retirement program	(89.1		)	—		(89.1		)	—
Litigation-related insurance proceeds	—			26.6		—			85.1
Net realized capital gains	51.1			51.4		90.8			165.7
Net income	$	490.4		$	497.6	$	1,613.1		$	1,551.2

⁽¹⁾  In addition to net realized capital gains, the following items are excluded from operating earnings because we believe they neither relate to the ordinary course of our business nor reflect our underlying business performance:

^•  In July 2011, we announced a voluntary early retirement program (the "Program").  In connection with the Program, we recorded a one-time charge of $89.1 million ($137.0 million pretax) during the three and nine months ended September 30, 2011.

^•  Following a Pennsylvania Supreme Court ruling in June 2009, we recorded litigation-related insurance proceeds of $26.6 million ($41.0 million pretax) and $85.1 million ($131.0 million pretax) for the three and nine months ended September 30, 2010, respectively, from our liability insurers related to certain litigation we settled in 2003.  

16. Reinsurance

In April 2011, we entered into three-year reinsurance agreements with Vitality Re II Limited, an unrelated insurer.  These agreements allow us to reduce our required statutory capital and provide an aggregate of $150 million of collateralized excess of loss reinsurance coverage on a portion of Aetna’s group Commercial Insured Health Care business.

17. Discontinued Products

Prior to 1993, we sold single-premium annuities (“SPAs”) and guaranteed investment contracts (“GICs”), primarily to employer sponsored pension plans.  In 1993, we discontinued selling these products to Large Case Pensions customers, and now we refer to these products as discontinued products.

We discontinued selling these products because they were generating losses for us, and we projected that they would continue to generate losses over their life (which is currently greater than 30 years for SPAs and less than 5 years for GICs); so we established a reserve for anticipated future losses at the time of discontinuance.  This reserve represents the present value (at the risk-free rate of return at the time of discontinuance, consistent with the duration of the liabilities) of the difference between the expected cash flows from the assets supporting these products and the cash flows expected to be required to meet the obligations of the outstanding contracts.  Because we projected anticipated cash shortfalls in our discontinued products, at the time of discontinuance we established a receivable from Large Case Pensions’ continuing products (which is eliminated in consolidation).

Key assumptions in setting this reserve include future investment results, payments to retirees, mortality and retirement rates and the cost of asset management and customer service.  In 1997, we began the use of a bond default assumption to reflect historical default experience.  In 1995, we modified the mortality tables used in order to reflect a more up-to-date 1994 Uninsured Pensioner’s Mortality table.  Other than these changes, since 1993 there have been no significant changes to the assumptions underlying the reserve.

We review the adequacy of this reserve quarterly based on actual experience.  As long as our expectation of future losses remains consistent with prior projections, the results of the discontinued products are applied to the reserve and do not affect net income.  However, if actual or expected future losses are greater than we currently estimate, we may increase the reserve, which could adversely impact net income.  If actual or expected future losses are less than we currently estimate, we may decrease the reserve, which could favorably impact net income.  The current reserve reflects management’s best estimate of anticipated future losses.  The reserve for anticipated future losses is included in future policy benefits on our balance sheet.

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The activity in the reserve for anticipated future losses on discontinued products for the nine months ended September 30, 2011 and 2010 was as follows (pretax):

(Millions)	2011		2010
Reserve, beginning of period	$	884.8	$	789.2
Operating income (loss)	4.7		(19.3		)
Net realized capital gains	19.3		84.2
Reserve, end of period	$	908.8	$	854.1

During the nine months ended September 30, 2011, our discontinued products reflected net realized capital gains (primarily attributable to gains from the sale of debt securities partially offset by losses from derivative transactions) and operating income. We evaluated these results against our expectations of future cash flows assumed in estimating the reserve and concluded that no adjustment to the reserve is required at September 30, 2011.

Assets and liabilities supporting discontinued products at September 30, 2011 and December 31, 2010 were asfollows: ⁽¹⁾ 

(Millions)	2011		2010
Assets:
Debt and equity securities available for sale	$	2,613.1	$	2,611.9
Mortgage loans	455.5		498.8
Other investments	654.5		601.6
Total investments	3,723.1		3,712.3
Other assets	81.7		90.4
Collateral received under securities loan agreements	—		35.1
Current and deferred income taxes	23.4		20.7
Receivable from continuing products (2)	515.3		492.4
Total assets	$	4,343.5	$	4,350.9
Liabilities:
Future policy benefits	$	3,040.9	$	3,162.2
Policyholders' funds	8.3		10.2
Reserve for anticipated future losses on discontinued products	908.8		884.8
Collateral payable under securities loan agreements	—		35.1
Other liabilities (3)	385.5		258.6
Total liabilities	$	4,343.5	$	4,350.9

⁽¹⁾  Assets supporting the discontinued products are distinguished from assets supporting continuing products.

⁽²⁾  The receivable from continuing products is eliminated in consolidation.

⁽³⁾  Net unrealized capital gains on the available-for-sale debt securities are included in other liabilities and are not reflected in consolidated shareholders’ equity.

The distributions on our discontinued products consisted of scheduled contract maturities, settlements and benefit payments of $102 million and $311 million for the three and nine months ended September 30, 2011, respectively, and $107 million and $321 million for the three and nine months ended September 30, 2010, respectively. Participant-directed withdrawals from our discontinued products were not significant in the three or nine months ended September 30, 2011 or 2010.  Cash required to fund these distributions was provided by earnings and scheduled payments on, and sales of, invested assets.

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Report of Independent Registered Public Accounting Firm

The Board of Directors and Shareholders

Aetna Inc.:

We have reviewed the consolidated balance sheet of Aetna Inc. and subsidiaries as of September 30, 2011, the related consolidated statements of income for the three-month and nine-month periods ended September 30, 2011 and 2010, and the related consolidated statements of shareholders' equity and cash flows for the nine-month periods ended September 30, 2011 and 2010. These consolidated financial statements are the responsibility of the Company's management.

We conducted our review in accordance with the standards of the Public Company Accounting Oversight Board (United States). A review of interim financial information consists principally of applying analytical procedures and making inquiries of persons responsible for financial and accounting matters. It is substantially less in scope than an audit conducted in accordance with the standards of the Public Company Accounting Oversight Board (United States), the objective of which is the expression of an opinion regarding the financial statements taken as a whole. Accordingly, we do not express such an opinion.

Based on our review, we are not aware of any material modifications that should be made to the consolidated financial statements referred to above for them to be in conformity with U.S. generally accepted accounting principles.

We have previously audited, in accordance with standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheet of Aetna Inc. and subsidiaries as of December 31, 2010, and the related consolidated statements of income, shareholders' equity, and cash flows for the year then ended (not presented herein); and in our report dated February 25, 2011, we expressed an unqualified opinion on those consolidated financial statements. In our opinion, the information set forth in the accompanying consolidated balance sheet as of December 31, 2010, is fairly stated, in all material respects, in relation to the consolidated balance sheet from which it has been derived.

/s/ KPMG LLP

Hartford, Connecticut

October 27, 2011

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Item 2.   Management’s Discussion and Analysis of Financial Condition and Results of Operations (“MD&A”)

OVERVIEW

We are one of the nation’s leading diversified health care benefits companies, serving approximately 36.3 million people with information and resources to help them make better informed decisions about their health care.  We offer a broad range of traditional and consumer-directed health insurance products and related services, including medical, pharmacy, dental, behavioral health, group life and disability plans, medical management capabilities, Medicaid health care management services and health information exchange technology services.  Our customers include employer groups, individuals, college students, part-time and hourly workers, health plans, governmental units, government-sponsored plans, labor groups and expatriates.  Our operations are conducted in three business segments:  Health Care, Group Insurance and Large Case Pensions.

The following MD&A provides a review of our financial condition at September 30, 2011 and December 31, 2010 and operating results for the three and nine months ended September 30, 2011 and 2010.  This Overview should be read in conjunction with the entire MD&A, which contains detailed information that is important to understanding our operating results and financial condition, the consolidated financial statements and other data presented in this Quarterly Report on Form 10-Q as well as the MD&A contained in our 2010 Annual Report on Form 10-K (the “2010 Annual Report”).  This Overview is qualified in its entirety by the full MD&A.

Summarized Results for the Three and Nine Months EndedSeptember 30, 2011 and 2010:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(Millions)	2011		2010		2011		2010
Revenue:
Health Care	$	7,832.9	$	7,894.1	$	23,282.7	$	23,699.4
Group Insurance	509.3		526.6		1,524.1		1,609.2
Large Case Pensions	133.1		118.1		400.7		397.5
Total revenue	8,475.3		8,538.8		25,207.5		25,706.1
Net income	490.4		497.6		1,613.1		1,551.2
Operating earnings: (1)
Health Care	525.7		442.2		1,593.9		1,369.7
Group Insurance	37.9		34.6		125.2		107.5
Large Case Pensions	4.4		5.6		16.4		21.4
Cash flows from operations					2,013.8		846.6

⁽¹⁾  Our discussion of operating results for our reportable business segments is based on operating earnings, which is a non-GAAP measure of net income (the term “GAAP” refers to U.S. generally accepted accounting principles).  Refer to “Segment Results and Use of Non-GAAP Measures” in this document beginning on page 36 for a discussion of non-GAAP measures.  Refer to pages 37, 40 and 41 for a reconciliation of operating earnings to net income for Health Care, Group Insurance and Large Case Pensions, respectively.

Our business segment operating earnings in aggregate improved for the three and nine months ended September 30, 2011 when compared to the corresponding periods in 2010. These results reflect lower than projected utilization, our pricing discipline and our medical cost management strategies, partially offset by the effect of lower Commercial Insured membership in 2011. Our operating earnings reflect approximately $181 million pretax and $107 million pretax of favorable development of prior period health care cost estimates for the three months ended September 30, 2011 and 2010, respectively. Our operating earnings reflect approximately $218 million pretax and $142 million pretax of favorable development of prior year health care cost estimates for the nine months ended September 30, 2011 and 2010, respectively.

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Total revenue declined during the three and nine months ended September 30, 2011 when compared to the corresponding periods in 2010 primarily due to a decline in Health Care premium, partially offset by higher Health Care fees and other revenue.

At September 30, 2011, we served approximately 18.2 million medical members (consisting of approximately 31% Insured members and 69% ASC members), 13.6 million dental members and 8.8 million pharmacy benefit management services members.  At September 30, 2010, we served approximately 18.5 million medical members (consisting of approximately 32% Insured members and 68% ASC members), 13.8 million dental members and 9.5 million pharmacy benefit management services members.

We continued to generate strong cash flows from operations in 2011 and 2010, generating $2.2 billion and $1.1 billion of cash flows from operations in our Health Care and Group Insurance businesses during the nine months ended September 30, 2011 and 2010, respectively.  During the first nine months of 2011, these cash flows funded ordinary course operating activities, acquisitions with an aggregate purchase price of approximately $1.1 billion, and the repayment of $450 million aggregate principal amount of our 7.875% senior notes due March 2011. Additionally, we repurchased approximately 31 million and 33 million shares of common stock under our share repurchase programs at a cost of approximately $1.2 billion and $1.0 billion during the nine months ended September 30, 2011 and 2010, respectively.  Refer to “Liquidity and Capital Resources” beginning on page 45 and Note 11 of Condensed Notes to Consolidated Financial Statements on page 24 for additional information.

During May 2011, we issued $500 million aggregate principal amount of 4.125% senior notes due in 2021 and used the majority of the proceeds to repay the $450 million aggregate principal amount of our 5.75% senior notes due June 2011.  Refer to “Liquidity and Capital Resources” beginning on page 45 and Note 11 of Condensed Notes to Consolidated Financial Statements on page 24 for additional information.

Acquisitions

During the nine months ended September 30, 2011, we completed the acquisitions of Medicity Inc. ("Medicity") and Prodigy Health Group ("Prodigy"). In October 2011, we completed the acquisitions of Genworth Financial, Inc.'s ("Genworth's") Medicare Supplement business and related blocks of in-force business and PayFlex Holdings, Inc. ("PayFlex"). Each of these acquisitions was funded using available resources.

•Medicity Inc.

In January 2011, we acquired Medicity, a health information exchange company, for approximately $490 million.

•Prodigy Health Group

In June 2011, we acquired Prodigy, a third party administrator of self-funded health care plans, for approximately $600 million.

•Genworth Financial, Inc.’s Medicare Supplement Business and Related Blocks of In-Force Business

In October 2011, we acquired Genworth's Medicare Supplement business and related blocks of in-force business for approximately $260 million.

•PayFlex Holdings, Inc.

In October 2011, we acquired PayFlex, one of the nation’s largest independent account-based health plan administrators, for approximately $190 million.

Refer to Notes 3 and 6 of Condensed Notes to Consolidated Financial Statements beginning on pages 7 and 9, respectively for additional information.

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Voluntary Early Retirement Program

In July 2011, we announced a voluntary early retirement program (the “Program”).  In connection with the Program, we recorded a one-time charge for enhanced severance and benefits of $89 million ($137 million pretax) during the three and nine months ended September 30, 2011.

Medicare Update

On June 13, 2011, the Centers for Medicare & Medicaid Services (“CMS”) lifted the intermediate sanctions it had previously imposed on us that required us to suspend the enrollment of and marketing to new members of all Aetna Medicare Advantage and Standalone Prescription Drug Plan (“PDP”) contracts.  The sanctions related to our compliance with certain Medicare Part D requirements.  We have resumed marketing our Medicare Advantage and PDP products and are enrolling beneficiaries with effective dates on and after July 1, 2011.  CMS still is not assigning any new low income subsidy members to our PDPs at this time.  However, low income subsidy members can make their own choice to enroll in Aetna products during the upcoming annual enrollment period.  As a result of these sanctions, our 2011 Medicare membership and operating results have been adversely affected because we did not participate in the 2010 open enrollment for individual 2011 Medicare plans, which occurred between November 15, 2010 and December 31, 2010.  We continue to cooperate fully with CMS to address residual matters identified in connection with the sanction review.

Board of Directors Update

Fernando Aguirre was appointed to our Board of Directors (the "Board") in July 2011, for a term that will run until our 2012 Annual Meeting of Shareholders. Mr. Aguirre is Chairman and Chief Executive Officer of Chiquita Brands International, Inc. He also serves on our Board's Audit Committee and Medical Affairs Committee. With the addition of Mr. Aguirre, our Board consists of thirteen directors.

Management Update

On February 25, 2011, the Board elected Mark T. Bertolini Chairman of the Board and Chairman of the Board’s Executive Committee, each effective April 8, 2011, upon the retirement of Ronald A. Williams, our previous executive Chairman.

Health Care Reform Legislation

In March 2010, President Obama signed into law the Patient Protection and Affordable Care Act and the Health Care and Education Reconciliation Act of 2010 (collectively, “Health Care Reform”), which makes broad-based changes to the U.S. health care system which could significantly affect the U.S. economy and will significantly impact our business operations and financial results, including our pricing and medical benefit ratios.  Health Care Reform presents us with new business opportunities, but also with new financial and other challenges.  It is reasonably possible that Health Care Reform, in the aggregate, could have a material adverse effect on our business operations and financial results.

Components of the legislation will be phased in over the next seven years.  We are and will continue to be required to dedicate material resources and incur material expenses during that time to implement and comply with Health Care Reform as well as state-level health care reform.  While the federal government has issued a number of regulations implementing Health Care Reform, many significant parts of the legislation, including health insurance exchanges and the implementation of minimum medical loss ratios (“MLRs”), require further guidance and clarification both at the federal level and in the form of regulations and actions by state legislatures to implement the law.  As a result, many of the impacts of Health Care Reform will not be known for several years.  Pending efforts in the U.S. Congress to repeal, amend or restrict funding for various aspects of Health Care Reform and pending litigation challenging the constitutionality of Health Care Reform create additional uncertainty about the ultimate impact of the legislation.

For additional information on Health Care Reform, including the pending litigation, refer to "Regulatory Environment" and "Forward-Looking Information/Risk Factors" beginning on page 47 and “MD&A - Overview – Health Care Reform Legislation”, “Regulatory Environment” and "Forward-Looking Information/Risk Factors" in our 2010 Annual Report.

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Segment Results and Use of Non-GAAP Measures in this Document

The following discussion of operating results is presented based on our reportable segments in accordance with the accounting guidance for segment reporting and consistent with our segment disclosure included in Note 15 of Condensed Notes to Consolidated Financial Statements beginning on page 29.  Our operations are conducted in three business segments: Health Care, Group Insurance and Large Case Pensions.  Our Corporate Financing segment is not a business segment; it is added to our business segments to reconcile our consolidated results.  The Corporate Financing segment includes interest expense on our outstanding debt and the financing components of our pension and other postretirement benefit plans (“OPEB”) expense (the service cost and prior service cost components of this expense are allocated to our business segments).  Effective December 31, 2010, our employees no longer earn future pension service credits in our tax-qualified noncontributory defined benefit pension plan (the “Aetna Pension Plan”).  The Aetna Pension Plan will continue to operate and account balances will continue to earn annual interest credits.  The decrease in our pension cost for the three and nine months ended September 30, 2011 compared to the corresponding periods in 2010 was caused by this freezing of the Aetna Pension Plan.  We expect our future pension expense to continue to be lower than 2010.  Refer to Note 10 of Condensed Notes to Consolidated Financial Statements on page 23.

Our discussion of our operating results is based on operating earnings, which is the measure reported to our Chief Executive Officer for purposes of assessing financial performance and making operating decisions, such as allocating resources to each segment.  Operating earnings exclude net realized capital gains or losses as well as other items, if any, from net income reported in accordance with GAAP.  We believe excluding realized capital gains or losses from net income to arrive at operating earnings provides more meaningful information about our underlying business performance.  Net realized capital gains and losses arise from various types of transactions, primarily in the course of managing a portfolio of assets that support the payment of liabilities; however, these transactions do not directly relate to the underwriting or servicing of products for our customers and are not directly related to the core performance of our business operations.  We also may exclude other items that do not relate to the ordinary course of our business from net income to arrive at operating earnings.  In each segment discussion in this MD&A, we provide a table that reconciles operating earnings to net income.  Each table details the net realized capital gains or losses and any other items excluded from net income, and the footnotes to each table describe the nature of each other item and why we believe it is appropriate to exclude that item from net income.

HEALTH CARE

Health Care consists of medical, pharmacy benefits management, dental, behavioral health and vision plans offered on both an Insured basis and an ASC basis.  Medical products include point-of-service (“POS”), preferred provider organization (“PPO”), health maintenance organization (“HMO”) and indemnity benefit plans.  Medical products also include health savings accounts and Aetna HealthFund^®, consumer-directed health plans that combine traditional POS or PPO and/or dental coverage, subject to a deductible, with an accumulating benefit account.  We also offer Medicare and Medicaid products and services, as well as specialty products, such as health information exchange technology services, medical management and data analytics services, medical stop loss insurance and products that provide access to our provider networks in select markets.  We separately track premiums and health care costs for Medicare and Medicaid products; all other medical, dental and other Health Care products are referred to as Commercial.

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Operating Summary for the Three and Nine Months Ended September 30, 2011 and 2010:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(Millions)	2011		2010		2011		2010
Premiums:
Commercial	$	5,074.3	$	5,140.7	$	15,119.3	$	15,432.5
Medicare	1,333.4		1,482.2		4,100.5		4,508.7
Medicaid	369.0		286.0		1,040.9		778.0
Total premiums	6,776.7		6,908.9		20,260.7		20,719.2
Fees and other revenue	919.2		824.4		2,658.4		2,538.9
Net investment income	83.7		100.8		261.6		313.5
Net realized capital gains	53.3		60.0		102.0		127.8
Total revenue	7,832.9		7,894.1		23,282.7		23,699.4
Health care costs	5,345.5		5,649.3		16,060.3		16,998.9
Operating expenses:
Selling expenses	249.8		285.8		772.2		866.8
General and administrative expenses	1,475.4		1,147.9		3,933.7		3,375.4
Total operating expenses	1,725.2		1,433.7		4,705.9		4,242.2
Amortization of other acquired intangible assets	30.6		21.7		79.7		66.9
Total benefits and expenses	7,101.3		7,104.7		20,845.9		21,308.0
Income before income taxes	731.6		789.4		2,436.8		2,391.4
Income taxes	260.3		281.9		865.7		827.4
Net income	$	471.3	$	507.5	$	1,571.1	$	1,564.0

The table presented below reconciles net income to operating earnings ⁽¹⁾ for the three and nine months ended September 30, 2011 and 2010:

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
(Millions)	2011			2010			2011			2010
Net income	$	471.3		$	507.5		$	1,571.1		$	1,564.0
Voluntary early retirement program	89.1			—			89.1			—
Litigation-related insurance proceeds	—			(26.6		)	—			(85.1		)
Net realized capital gains	(34.7		)	(38.7		)	(66.3		)	(109.2		)
Operating earnings	$	525.7		$	442.2		$	1,593.9		$	1,369.7

⁽¹⁾  In addition to net realized capital gains, the following items are excluded from operating earnings because we believe they neither relate to the ordinary course of our business nor reflect our underlying business performance:

• In July 2011, we announced a voluntary early retirement program (the "Program").  In connection with the Program, we recorded a one-time charge of $89.1 million ($137.0 million pretax) during the three and nine months ended September 30, 2011.

• Following a Pennsylvania Supreme Court ruling in June 2009, we recorded litigation-related insurance proceeds of $26.6 million ($41.0 million pretax) and $85.1 million ($131.0 million pretax) for the three and nine months ended September 30, 2010, respectively, from our liability insurers related to certain litigation we settled in 2003.  

Operating earnings for the three and nine months ended September 30, 2011 were higher than the corresponding periods in 2010, primarily due to higher Commercial underwriting margins which continued to benefit from lower than projected utilization and disciplined execution of our pricing and medical cost management strategies, partially offset by the effect of lower Commercial Insured membership in 2011.  Included in these amounts are approximately $117 million ($181 million pretax) and $69 million ($107 million pretax) of favorable development of prior period health care costs estimates for the three months ended September 30, 2011 and 2010, respectively.

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We calculate our medical benefit ratio (“MBR”) by dividing health care costs by premiums.  For the three and nine months ended September 30, 2011 and 2010, our MBRs by product were as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2011		2010		2011		2010
Commercial	77.8	%	80.5	%	77.5	%	80.5	%
Medicare	81.4	%	84.9	%	83.7	%	86.1	%
Medicaid	84.7	%	88.8	%	86.7	%	88.1	%
Total	78.9	%	81.8	%	79.3	%	82.0	%

Refer to our discussion of Commercial and Medicare results below for an explanation of the changes in our MBRs.

Commercial results reflect higher underwriting margins and lower Insured membership in 2011 compared to 2010.

Commercial premiums decreased approximately $66 million and $313 million for the three and nine months ended September 30, 2011, respectively, when compared to the corresponding periods in 2010, primarily due to lower Commercial Insured membership in 2011, partially offset by premium rate increases as well as changes in the customer market, product and geographic mix of business.

Our Commercial MBRs were 77.8% and 77.5% for the three and nine months ended September 30, 2011, respectively, compared to 80.5% for each of the corresponding periods in 2010.  Included in these amounts were approximately $141 million and $90 million of favorable development of prior period health care cost estimates for the three months ended September 30, 2011 and 2010, respectively.  The significant majority of favorable development of prior-period Commercial health care cost estimates for the three months ended September 30, 2011 and 2010 relates to the current year, primarily from second-quarter 2011 and 2010 medical cost trend emerging favorably in each year, primarily due to lower than projected utilization of medical services. Excluding this development, the Commercial MBR remains lower in 2011 than 2010, reflecting lower than projected utilization of medical services across all key medical cost categories. Refer to “Critical Accounting Estimates – Health Care Costs Payable” in our 2010 Annual Report for a discussion of Health Care Costs Payable at December 31, 2010.

Medicare results for the three and nine months ended September 30, 2011 reflect a decline in membership from the corresponding periods in 2010.

Medicare premiums decreased approximately $149 million and $408 million for the three and nine months ended September 30, 2011, respectively, when compared to the corresponding periods in 2010, primarily attributable to a decrease in Medicare membership in 2011 due to the intermediate sanctions imposed on us by CMS, which did not allow us to participate in the 2010 open enrollment for individual 2011 Medicare plans.

Our Medicare MBRs were 81.4% and 83.7% for the three and nine months ended September 30, 2011, respectively, compared to 84.9% and 86.1% for the corresponding periods in 2010.  Included in these amounts were approximately $22 million and $6 million of favorable development of prior period Medicare health care cost estimates for the three months ended September 30, 2011 and 2010, respectively.  Excluding this development, the Medicare MBR remains lower in 2011 than 2010, primarily reflecting changes in mix of business, lower than projected utilization of medical services and higher risk-adjusted CMS revenue.

Other Sources of Revenue

Health Care fees and other revenue for the three and nine months ended September 30, 2011 increased $95 million and $120 million compared to the corresponding periods in 2010 primarily as a result of higher Commercial ASC fee yields, including pharmacy benefit management fees from our relationship with CVS Caremark Corporation, and additional revenue from the businesses we acquired through September 30, 2011, partially offset by the impact of lower Commercial ASC membership.

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General and Administrative Expenses

General and administrative expenses increased during the three and nine months ended September 30, 2011, due primarily to the one-time charge associated with the voluntary early retirement program that we announced in July 2011, the inclusion of expenses associated with acquisitions completed within the nine months ended September 30, 2011, the settlement of certain contractual disputes during the three months ended September 30, 2011 and increased investment spending, including open enrollment and marketing initiatives. Additionally, the three and nine months ended September 30, 2010 included litigation-related insurance proceeds which lowered general and administrative expenses in 2010.

Membership

Health Care’s membership at September 30, 2011 and 2010 was as follows:

	2011			2010
(Thousands)	Insured	ASC	Total	Insured	ASC	Total
Medical:
Commercial	4,757	11,804	16,561	5,051	11,857	16,908
Medicare	408	—	408	449	—	449
Medicaid	426	835	1,261	366	805	1,171
Total Medical Membership	5,591	12,639	18,230	5,866	12,662	18,528
Consumer-Directed Health Plans (1)			2,399			2,225
Dental:
Commercial	4,729	7,366	12,095	4,963	7,243	12,206
Medicare and Medicaid	187	466	653	170	455	625
Network Access(2)	—	899	899	—	967	967
Total Dental Membership	4,916	8,731	13,647	5,133	8,665	13,798
Pharmacy:
Commercial			8,162			8,646
Medicare PDP (stand-alone)			429			622
Medicare Advantage PDP			188			231
Medicaid			27			30
Total Pharmacy Benefit Management Services			8,806			9,529

⁽¹⁾  Represents members in consumer-directed health plans who also are included in Commercial medical membership above.

⁽²⁾  Represents members in products that allow these members access to our dental provider network for a nominal fee.

Total medical membership at September 30, 2011 decreased compared to September 30, 2010, reflecting a reduction in Commercial membership due primarily to in-group attrition and lapsed customers that exceeded new sales, as well as lower Medicare enrollment primarily due to CMS sanctions that was partially offset by approximately 531 thousand additional ASC members from the Prodigy acquisition and growth in Medicaid membership.

Total dental membership at September 30, 2011 decreased compared to September 30, 2010 primarily due to lapsed customers that exceeded new sales, partially offset by approximately 394 thousand additional members from the Prodigy acquisition.

Total pharmacy benefit management services membership decreased at September 30, 2011 compared to September 30, 2010 primarily due to a decrease in Commercial medical enrollment and a decline in Medicare PDP membership, partially offset by approximately 282 thousand additional members from the Prodigy acquisition.

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We project that Commercial ASC membership in large accounts will decline by approximately 500 thousand members in the first quarter of 2012 compared to year end 2011, with the decline partially offset by growth in our other businesses.

GROUP INSURANCE

Group Insurance primarily includes group life insurance products offered on an Insured basis, including basic and supplemental group term life, group universal life, supplemental or voluntary programs, and accidental death and dismemberment coverage.  Group Insurance also includes: (i) group disability products offered to employers on both an Insured and an ASC basis, which consist primarily of short-term and long-term disability insurance (and products which combine both), (ii) absence management services offered to employers, which include short-term and long-term disability administration and leave management, and (iii) long-term care products that were offered primarily on an Insured basis, which provide benefits covering the cost of care in private home settings, adult day care, assisted living or nursing facilities.  We no longer solicit or accept new long-term care customers.

Operating Summary for the Three and Nine Months EndedSeptember 30, 2011 and 2010:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(Millions)	2011		2010		2011		2010
Premiums:
Life	$	256.4	$	266.1	$	777.4	$	822.8
Disability	133.9		130.9		400.0		403.2
Long-term care	11.7		13.1		34.5		40.5
Total premiums	402.0		410.1		1,211.9		1,266.5
Fees and other revenue	24.6		26.1		76.2		79.0
Net investment income	62.4		65.5		204.8		203.1
Net realized capital gains	20.3		24.9		31.2		60.6
Total revenue	509.3		526.6		1,524.1		1,609.2
Current and future benefits	350.0		368.0		1,067.4		1,138.3
Operating expenses:
Selling expenses	19.3		19.0		54.8		62.0
General and administrative expenses	67.0		65.3		196.3		197.0
Total operating expenses	86.3		84.3		251.1		259.0
Amortization of other acquired intangible assets	1.1		1.7		3.9		5.1
Total benefits and expenses	437.4		454.0		1,322.4		1,402.4
Income before income taxes	71.9		72.6		201.7		206.8
Income taxes	20.8		21.8		56.2		52.1
Net income	$	51.1	$	50.8	$	145.5	$	154.7

The table presented below reconciles net income to operating earnings for the three and nine months ended September 30, 2011 and 2010:

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
(Millions)	2011			2010			2011			2010
Net income	$	51.1		$	50.8		$	145.5		$	154.7
Net realized capital gains	(13.2		)	(16.2		)	(20.3		)	(47.2		)
Operating earnings	$	37.9		$	34.6		$	125.2		$	107.5

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Operating earnings for the three and nine months ended September 30, 2011 increased compared to the corresponding periods in 2010, primarily due to higher underwriting margins from our disability products.

The group benefit ratio (which represents current and future benefits divided by premiums) was 87.1% and 88.1% for the three and nine months ended September 30, 2011, respectively, compared to 89.7% and 89.9% for corresponding periods in 2010.

LARGE CASE PENSIONS

Large Case Pensions manages a variety of retirement products (including pension and annuity products) primarily for tax qualified pension plans.  These products provide a variety of funding and benefit payment distribution options and other services.  The Large Case Pensions segment includes certain discontinued products.

Operating Summary for the Three and Nine Months EndedSeptember 30, 2011 and 2010:

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
(Millions)	2011		2010			2011		2010
Premiums	$	37.8	$	38.8		$	125.0	$	117.6
Net investment income	87.5		81.9			261.1		260.5
Other revenue	2.8		2.7			8.1		8.1
Net realized capital gains (losses)	5.0		(5.3		)	6.5		11.3
Total revenue	133.1		118.1			400.7		397.5
Current and future benefits	120.7		112.9			366.5		350.3
General and administrative expenses	3.5		3.4			10.8		8.8
Total benefits and expenses	124.2		116.3			377.3		359.1
Income before income taxes	8.9		1.8			23.4		38.4
Income taxes (benefits)	1.3		(.3		)	2.8		7.7
Net income	$	7.6	$	2.1		$	20.6	$	30.7

The table presented below reconciles net income to operating earnings for the three and nine months ended September 30, 2011 and 2010:

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
(Millions)	2011			2010		2011			2010
Net income	$	7.6		$	2.1	$	20.6		$	30.7
Net realized capital (gains) losses	(3.2		)	3.5		(4.2		)	(9.3		)
Operating earnings	$	4.4		$	5.6	$	16.4		$	21.4

Operating earnings in 2011 declined compared to 2010, due primarily to the run-off nature of this segment.

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Discontinued Products

Prior to 1993, we sold single-premium annuities (“SPAs”) and guaranteed investment contracts (“GICs”), primarily to employer sponsored pension plans.  In 1993, we discontinued selling these products to Large Case Pensions customers, and now we refer to these products as discontinued products.

We discontinued selling these products because they were generating losses for us, and we projected that they would continue to generate future losses over their life (which is currently greater than 30 years for SPAs and less than 5 years for GICs); so we established a reserve for anticipated future losses at the time of discontinuance.  We provide additional information on this reserve, including key assumptions and other important information, in Note 17 of Condensed Notes to Consolidated Financial Statements beginning on page 30.

The operating summary for Large Case Pensions on page 41 includes revenues and expenses related to our discontinued products, with the exception of net realized capital gains and losses which are recorded as part of current and future benefits.  Since we established a reserve for future losses on discontinued products, as long as our expected future losses remain consistent with prior projections, the operating results of our discontinued products are applied against the reserve and do not impact operating earnings or net income for Large Case Pensions. However, if actual or expected future losses are greater than we currently estimate, we may increase the reserve, which could adversely impact net income.  If actual or expected future losses are less than we currently estimate, we may decrease the reserve, which could favorably impact net income.  In those cases, we disclose such adjustment separately in the operating summary.  Management reviews the adequacy of the discontinued products reserve quarterly.  The current reserve reflects management's best estimate of anticipated future losses.

The activity in the reserve for anticipated future losses on discontinued products for the nine months ended September 30, 2011 and 2010 was as follows (pretax):

(Millions)	2011		2010
Reserve, beginning of period	$	884.8	$	789.2
Operating income (loss)	4.7		(19.3		)
Net realized capital gains	19.3		84.2
Reserve, end of period	$	908.8	$	854.1

During the nine months ended September 30, 2011, our discontinued products reflected net realized capital gains (primarily attributable to gains from the sale of debt securities partially offset by losses from derivative transactions) and operating income. We evaluated these results against our expectations of future cash flows assumed in estimating the reserve and concluded that no adjustment to the reserve is required at September 30, 2011.

INVESTMENTS

At September 30, 2011 and December 31, 2010 our investment portfolio consisted of the following:

(Millions)	September 30, 2011		December 31, 2010
Debt and equity securities available for sale	$	16,771.7	$	16,961.6
Mortgage loans	1,605.8		1,509.8
Other investments	1,329.0		1,244.6
Total investments	$	19,706.5	$	19,716.0

The risks associated with investments supporting experience-rated pension and annuity products in our Large Case Pensions business are assumed by the contract holders and not by us (subject to, among other things, certain minimum guarantees).  Anticipated future losses associated with the discontinued fully-guaranteed Large Case Pensions products are provided for in the reserve for anticipated future losses on discontinued products.

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As a result of the foregoing, investment risks associated with our experience-rated and discontinued products generally do not impact our operating results.  Our investment portfolio supported the following products at September 30, 2011 and December 31, 2010:

(Millions)	September 30, 2011		December 31, 2010
Experience-rated products	$	1,681.8	$	1,690.2
Discontinued products	3,723.1		3,712.3
Remaining products	14,301.6		14,313.5
Total investments	$	19,706.5	$	19,716.0

Assets supporting experience-rated products may be subject to contract holder or participant withdrawals. Experience-rated contract holder and participant-directed withdrawals for the three and nine months ended September 30, 2011 and 2010 were as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(Millions)	2011		2010		2011		2010
Scheduled contract maturities and benefit payments (1)	$	63.1	$	64.7	$	191.0	$	197.2
Contract holder withdrawals other than scheduled contract
maturities and benefit payments	19.7		5.6		27.5		10.4
Participant-directed withdrawals	.5		1.6		2.9		2.8

⁽¹⁾  Includes payments made upon contract maturity and other amounts distributed in accordance with contract schedules.

Debt and Equity Securities

The debt securities in our investment portfolio had an average credit quality rating of A at both September 30, 2011 and December 31, 2010, with approximately $4.1 billion at September 30, 2011 and $4.4 billion at December 31, 2010 rated AAA.  The debt securities that were rated below investment grade (that is, having a quality rating below BBB-/Baa3) were $1.1 billion at September 30, 2011 and $1.2 billion at December 31, 2010 (of which 21% and 17% at September 30, 2011 and December 31, 2010, respectively, supported our discontinued and experience-rated products).

At September 30, 2011 and December 31, 2010, we held approximately $719 million and $707 million, respectively, of municipal debt securities and $2 million on each date of structured product debt securities that were guaranteed by third parties, collectively representing approximately 4% of our total investments on each date.  These securities had an average credit quality rating of A+ at both September 30, 2011 and December 31, 2010 with the guarantee.  Without the guarantee, the average credit quality rating of the municipal debt securities was A at both September 30, 2011 and December 31, 2010.  The structured product debt securities without guarantees are not rated by the rating agencies on a standalone basis.  We do not have any significant concentration of investments with third party guarantors (either direct or indirect).

We classify our debt and equity securities as available for sale, and carry them at fair value on our balance sheet.  Approximately 2% of our debt and equity securities at both September 30, 2011 and December 31, 2010 were valued using inputs that reflect our own assumptions (categorized as Level 3 inputs in accordance with GAAP).  Refer to Note 9 of Condensed Notes to Consolidated Financial Statements beginning on page 17 for additional information on the methodologies and key assumptions we use to determine the fair value of investments.

At September 30, 2011 and December 31, 2010, our debt and equity securities had net unrealized capital gains of $1.3 billion and $985 million, respectively, of which $428 million and $301 million, respectively, related to our experience-rated and discontinued products.

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Refer to Note 7 of Condensed Notes to Consolidated Financial Statements beginning on page 10 for details of net unrealized capital gains and losses by major security type, as well as details on our debt securities with unrealized capital losses at September 30, 2011 and December 31, 2010.  We regularly review our debt securities to determine if a decline in fair value below the carrying value is other-than-temporary.  If we determine a decline in fair value is other-than-temporary, we will write down the carrying value of the security.  The amount of the credit-related impairment is included in our operating results, and the non-credit component is included in other comprehensive income if we do not intend to sell the security.  Accounting for other-than-temporary-impairments ("OTTI") of our debt securities is considered a critical accounting estimate.  Refer to “Critical Accounting Estimates - Other-Than-Temporary Impairment of Debt Securities” in our 2010 Annual Report for more information.

Net Realized Capital Gains and Losses

Net realized capital gains were $51 million ($79 million pretax) and $91 million ($140 million pretax) for the three and nine months ended September 30, 2011, respectively, and $51 million ($80 million pretax) and $166 million ($200 million pretax) for the corresponding periods in 2010, respectively.  We had no individual realized capital losses on debt or equity securities that materially impacted our operating results during the three or nine months ended September 30, 2011 or 2010.

Mortgage Loans

Our mortgage loan portfolio (which is collateralized by commercial real estate) represented 8% of our total invested assets at both September 30, 2011 and December 31, 2010.  There were no material impairment reserves on these loans at September 30, 2011 or December 31, 2010.  Refer to Note 7 of Condensed Notes to Consolidated Financial Statements on page 10 for additional information on our mortgage loan portfolio.

Risk Management and Market-Sensitive Instruments

We manage interest rate risk by seeking to maintain a tight match between the durations of our assets and liabilities where appropriate.  We manage credit risk by seeking to maintain high average quality ratings and diversified sector exposure within our debt securities portfolio.  In connection with our investment and risk management objectives, we also use derivative financial instruments whose market value is at least partially determined by, among other things, levels of or changes in interest rates (short-term or long-term), duration, prepayment rates, equity markets or credit ratings/spreads.  Our use of these derivatives is generally limited to hedging risk and has principally consisted of using interest rate swap agreements, forward contracts, futures contracts, put options and credit default swaps.  Additionally, from time to time, we receive warrants from our vendors.  These instruments, viewed separately, subject us to varying degrees of interest rate, equity price and credit risk.  However, when used for hedging, we expect these instruments to reduce overall risk.

We regularly evaluate our risk from market-sensitive instruments by examining, among other things, levels of or changes in interest rates (short-term or long-term), duration, prepayment rates, equity markets or credit ratings/spreads.  We also regularly evaluate the appropriateness of investments relative to our management-approved investment guidelines (and operate within those guidelines) and the business objectives of our portfolios.

On a quarterly basis, we review the impact of hypothetical net losses in our investment portfolio on our consolidated near-term financial position, operating results and cash flows assuming the occurrence of certain reasonably possible changes in near-term market rates and prices.  Based upon this analysis, there have been no material changes in our exposure to these risks since December 31, 2010.  Refer to the MD&A in our 2010 Annual Report for a more complete discussion of risk management and market-sensitive instruments.

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LIQUIDITY AND CAPITAL RESOURCES

Cash Flows

We meet our operating cash requirements by maintaining liquidity in our investment portfolio, using overall cash flows from premiums, fees and other revenue, deposits and income received on investments, and issuing commercial paper from time to time.  We monitor the duration of our investment portfolio of highly marketable debt securities and mortgage loans, and execute purchases and sales of these investments with the objective of having adequate funds available to satisfy our maturing liabilities.  Overall cash flows are used primarily for claim and benefit payments, contract withdrawals, operating expenses, share repurchases and shareholder dividends.  We have a committed short-term borrowing capacity of $1.5 billion through our revolving credit facility.  During the nine months ended September 30, 2011, we also used our cash flows for business acquisitions and to repay maturing long-term debt.

Presented below is a condensed statement of cash flows for the nine months ended September 30, 2011 and 2010.  We present net cash flows used for operating activities and net cash flows provided by investing activities separately for our Large Case Pensions segment because changes in the insurance reserves for the Large Case Pensions segment (which are reported as cash used for operating activities) are funded from the sale of investments (which are reported as cash provided by investing activities).  Refer to the Consolidated Statements of Cash Flows on page 4 for additional information.

(Millions)	2011			2010
Cash flows from operating activities
Health Care and Group Insurance	$	2,216.9		$	1,076.2
Large Case Pensions	(203.1		)	(229.6		)
Net cash provided by operating activities	2,013.8			846.6
Cash flows from investing activities
Health Care and Group Insurance	(1,009.8		)	77.3
Large Case Pensions	255.6			177.0
Net cash (used for) provided by investing activities	(754.2		)	254.3
Net cash used for financing activities	(1,169.4		)	(509.0		)
Net increase in cash and cash equivalents	$	90.2		$	591.9

Cash Flow Analysis

Cash flows provided by operating activities for Health Care and Group Insurance were approximately $2.2 billion for the nine months ended September 30, 2011 and $1.1 billion for the nine months ended September 30, 2010.  The increase for the nine months ended September 30, 2011 compared with the corresponding period in 2010 is primarily attributable to improved operating performance.

During the nine months ended September 30, 2011, we paid approximately $1.1 billion for business acquisitions and repaid the $450 million aggregate principal amount of our 7.875% senior notes due March 2011, in each case using available resources.  We also issued $500 million of 4.125% senior notes due in 2021 and used the majority of the proceeds to repay the entire $450 million aggregate principal amount of our 5.75% senior notes due June 2011. Additionally, we repurchased approximately 31 million and 33 million shares of common stock at a cost of approximately $1.2 billion and $1.0 billion during the nine months ended September 30, 2011 and 2010, respectively. At September 30, 2011, the capacity remaining under our share repurchase authorizations was approximately $1 billion. Refer to Note 12 of the Condensed Notes to Consolidated Financial Statements on page 25 for more information on our share repurchases. We also made $60 million and $505 million of voluntary cash contributions to our tax-qualified noncontributory Pension Plan during the three and nine months ended September 30, 2011 and 2010, respectively.

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In February 2011, we announced that our Board increased our cash dividend to shareholders to $.15 per share and moved us to a quarterly dividend payment cycle.  Prior to February 2011, our policy had been to pay an annual dividend of $.04 per share.  During the nine months ended September 30, 2011 our Board declared the following cash dividends:

	Dividend Amount		Stockholders of	Date Paid/	Total Dividends
Date Declared	Per Share		Record Date	To be Paid	(Millions)
February 3, 2011	$	.15	April 14, 2011	April 29, 2011	$	57.0
May 20, 2011	.15		July 14, 2011	July 29, 2011	55.9
September 23, 2011	.15		October 13, 2011	October 28, 2011	54.3

Declaration and payment of future dividends is at the discretion of our Board and may be adjusted as business needs or market conditions change.

Other Liquidity Information

From time to time, we use short-term commercial paper borrowings to address timing differences between cash receipts and disbursements.  At September 30, 2011, we had approximately $450 million of commercial paper outstanding.  The maximum amount of commercial paper borrowings outstanding during the nine months ended September 30, 2011 was $981 million.

Our committed short-term borrowing capacity consists of a $1.5 billion revolving credit facility which terminates in March 2013 (the “Facility”).  The Facility also provides for the issuance of letters of credit at our request, up to $200 million, which count as usage of the available commitments under the Facility.  The Facility permits the aggregate commitments under the Facility to be expanded to a maximum of $2.0 billion upon our agreement with one or more financial institutions. There were no amounts outstanding under the Facility at any time during the three or nine months ended September 30, 2011.

Our debt to capital ratio (calculated as the sum of all short- and long-term debt outstanding (“total debt”) divided by the sum of shareholders’ equity plus total debt) was approximately 30% at September 30, 2011.  We continually monitor existing and alternative financing sources to support our capital and liquidity needs, including, but not limited to, debt issuance, preferred or common stock issuance, reinsurance and pledging or selling of assets.

Interest expense was $60 million and $187 million for the three and nine months ended September 30, 2011, respectively, and $64 million and $186 million for the three and nine months ended September 30, 2010, respectively.

Refer to Note 11 of Condensed Notes to Consolidated Financial Statements beginning on page 24 for additional information on our short-term and long-term debt.

Other Common Stock Transactions

On February 7, 2011, approximately .6 million performance stock units, 1.2 million market stock units and 1.0 million restricted stock units were granted to certain employees.  Refer to Note 12 of Condensed Notes to Consolidated Financial Statements on page 25 for additional information.

CRITICAL ACCOUNTING ESTIMATES

Refer to “Critical Accounting Estimates” in our 2010 Annual Report for information on accounting policies that we consider critical in preparing our Consolidated Financial Statements.  These policies include significant estimates we make using information available at the time the estimates are made.  However, these estimates could change materially if different information or assumptions were used, and these estimates may not reflect the actual amounts of the final transactions that occur.

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REGULATORY ENVIRONMENT

Except as set forth below, there were no material changes in the regulation of our business since December 31, 2010.  Refer to the "Regulatory Environment" section in our 2010 Annual Report for information on the regulation of our business.

• Enhanced rate review and disclosure processes by states and the U.S. Department of Health and Human Services (“HHS”) are a key provision of Health Care Reform.  HHS has issued a final rule providing that states that have “effective review processes” will perform rate reviews, and HHS will perform reviews in all other states.  HHS has determined that a significant majority of states have an effective review process.  We are continuing to evaluate the impact of this and other key provisions of Health Care Reform (assuming they are implemented in their current form) to determine the impact that they will have on our business operations and financial results.  HHS’ final rule does not replace the current state rate approval process.  Instead it adds analysis and disclosure related to reasonableness of rate increases to that process, which may impact state approval decision-making and further affect our ability to price for the risk we assume on a timely basis.

• Health insurance exchanges (“Exchanges”) are scheduled to be operational in 2014. In July 2011, HHS released proposed rules establishing a framework to assist states in setting up Exchanges.  HHS also released proposed rules governing state and federal reinsurance, risk adjustment and risk corridor programs designed to mitigate adverse selection and provide premium stability in individual and small group Exchanges. In September 2011, HHS released additional information regarding a "partnership model" in which states could perform certain functions for an otherwise federally administered Exchange.

• All 50 states and the District of Columbia have held or are still holding regular legislative sessions in 2011.  In 2011 to date, state legislatures have focused on state budget deficits as well as preliminary Exchange design and implementation.  A limited number of states have passed Exchange laws, and a number of states have passed Exchange planning laws.  We expect additional state level legislation that impacts our business to be enacted in 2011.

• In July 2011, New York notified insurers that it expects insurers to, and will be amending its regulations to require insurers to, regularly consult the U.S. Social Security Administration’s Death Master File or a similar database to determine if unclaimed death benefits may be payable under life insurance and similar products, to pay any such benefits and to make certain other business process changes.

FORWARD-LOOKING INFORMATION/RISK FACTORS

Certain information in this MD&A is forward-looking within the meaning of the Private Securities Litigation Reform Act of 1995.  Forward-looking statements are subject to uncertainties that are outside our control and could cause actual future results to differ materially from those statements.  You should not place undue reliance on forward-looking statements, and we disclaim any intention or obligation to update or revise forward-looking statements.

The following information supplements the Forward Looking Information/Risk Factors portion of our 2010 Annual Report.  You should read that section of our 2010 Annual Report and the information below carefully because each of them contains a discussion of important risk factors that could adversely affect our business as well as the market price for our common stock.

• We are subject to potential changes in Health Care Reform that can adversely affect our profitability. Three U.S. Courts of Appeals have issued decisions in cases involving constitutional challenges to Health Care Reform's obligation to purchase health care coverage (the “individual mandate”). One of these courts found the individual mandate unconstitutional, but held that it was severable from the remainder of Health Care Reform, which the court determined was otherwise constitutional. The U.S. Department of Justice has asked the U.S. Supreme Court to review this decision. These developments, as well as other pending litigation regarding the constitutionality of Health Care Reform, increase the risk of significant alteration of Health Care Reform that could materially and adversely affect our health care operations and/or financial results. For example, if the Supreme Court were to find the individual mandate unconstitutional, but generally uphold the remainder of Health Care Reform, particularly our obligation to offer health insurance to each person who

Page 47

purchases it, people with greater needs for health care services could make up an increased portion of our Insured membership, which would adversely affect our operating earnings and medical benefit ratios. These effects could be magnified if we are unable to obtain, or are delayed in obtaining, approval of adequate premium rates for the risk we assume.

• On June 13, 2011, the Centers for Medicare & Medicaid Services (“CMS”) lifted the intermediate sanctions it had previously imposed on us that required us to suspend the enrollment of and marketing to new members of all Aetna Medicare Advantage and Standalone Prescription Drug Plan (“PDP”) contracts.  The sanctions related to our compliance with certain Medicare Part D requirements.  We have resumed marketing our Medicare Advantage and PDP products and are enrolling beneficiaries with effective dates on and after July 1, 2011.  CMS still is not assigning any new low income subsidy members to our PDPs at this time.  However, low income subsidy members can make their own choice to enroll in Aetna products during the upcoming annual enrollment period.  As a result of these sanctions, our 2011 Medicare membership and operating results have been adversely affected because we did not participate in the 2010 open enrollment for individual 2011 Medicare plans, which occurred between November 15, 2010 and December 31, 2010.  We continue to cooperate fully with CMS to address residual matters identified in connection with the sanction review.

• Our business activities are highly regulated.  New laws or regulations or changes in existing laws or regulations or their enforcement or application could adversely affect our business and profitability.  For example: in July 2011, New York notified insurers that it expects insurers to, and will be amending its regulations to require insurers to, regularly consult the U.S. Social Security Administration’s Death Master File or a similar database to determine if unclaimed death benefits may be payable under life insurance and similar products, to pay any such benefits and to make certain other business process changes.

This information should be read in conjunction with the more detailed description of risk factors that may be found in our reports filed with the U.S. Securities and Exchange Commission from time to time, including our 2010 Annual Report, quarterly reports on Form 10-Q and current reports on Form 8-K.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

We have not experienced any material changes in exposures to market risk since December 31, 2010.  Refer to the information contained in the “Risk Management and Market-Sensitive Instruments” section of the MD&A beginning on page 44 for a discussion of our exposures to market risk.

Item 4. Controls and Procedures

Disclosure Controls and Procedures

We maintain disclosure controls and procedures, which are designed to ensure that information that we are required to disclose in the reports we file or submit under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms, and that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure.

An evaluation of the effectiveness of our disclosure controls and procedures as of September 30, 2011 was conducted under the supervision and with the participation of our Chief Executive Officer and Chief Financial Officer.  Based on that evaluation, our Chief Executive Officer and Chief Financial Officer have concluded that our disclosure controls and procedures as of September 30, 2011 were effective and designed to ensure that material information relating to Aetna Inc. and its consolidated subsidiaries would be made known to the Chief Executive Officer and Chief Financial Officer by others within those entities, particularly during the periods when periodic reports under the Exchange Act are being prepared.  Refer to the Certifications by our Chief Executive Officer and Chief Financial Officer filed as Exhibits 31.1 and 31.2 to this report.

Page 48

Changes in Internal Control over Financial Reporting

There has been no change in our internal control over financial reporting identified in connection with the evaluation of such control that occurred during our most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

Part II. Other Information

Item 1. Legal Proceedings

The information contained in Note 14 of Condensed Notes to Consolidated Financial Statements, beginning on page 26 is incorporated herein by reference.

Item 1A. Risk Factors

The information contained under the heading “Forward-Looking Information/Risk Factors” in the MD&A, beginning on page 47 is incorporated herein by reference.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

The following table provides information about our monthly share repurchases, all of which were purchased as part of a publicly-announced program, for the three months ended September 30, 2011:

Issuer Purchases of Equity Securities
(Millions, except per share amounts)	Total Number of Shares Purchased	Average Price Paid Per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Approximate Dollar Value of Shares That May Yet Be Purchased Under the Plans or Programs
July 1, 2011 - July 31, 2011	—	$	—	—	$	750.2
August 1, 2011 - August 31, 2011	7.1	37.44		7.1	481.8
September 1, 2011 - September 30, 2011	5.7	39.60		5.7	1,007.7
Total	12.8	$	38.39	12.8	N/A

Our Board of Directors authorized three separate share repurchase programs on December 3, 2010, May 20, 2011 and September 23, 2011. Each repurchase program authorized us to repurchase up to $750 million of our common stock.  During the three months ended September 30, 2011, we repurchased approximately 13 million shares of common stock at a cost of approximately $493 million.  At September 30, 2011, we had remaining authorization to repurchase an aggregate of up to approximately $1 billion of common stock under the May 20, 2011 and September 23, 2011 programs.

Page 49

Item 6. Exhibits

Exhibits to this Form 10-Q are as follows:

11	Statements re: computation of per share earnings
11.1	Computation of per share earnings is incorporated herein by reference to Note 4 of Condensed Notes to Consolidated Financial Statements, beginning on page 7 in this Form 10-Q.
12	Statements re: computation of ratios
12.1	Computation of ratio of earnings to fixed charges.
15	Letter re: unaudited interim financial information
15.1	Letter from KPMG LLP acknowledging awareness of the use of a report dated October 27, 2011 related to their review of interim financial information.
31	Rule 13a-14(a)/15d-14(a) Certifications
31.1	Certification.
31.2	Certification.
32	Section 1350 Certifications
32.1	Certification.
32.2	Certification.
101	XBRL Documents
101.INS	XBRL Instance Document.
101.SCH	XBRL Taxonomy Extension Schema.
101.CAL	XBRL Taxonomy Extension Calculation Linkbase.
101.DEF	XBRL Taxonomy Extension Definition Linkbase.
101.LAB	XBRL Taxonomy Extension Label Linkbase.
101.PRE	XBRL Taxonomy Extension Presentation Linkbase.

Page 50

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

Aetna Inc.

Registrant

Date:	October 27, 2011	By	/s/ Rajan Parmeswar
			Rajan Parmeswar
			Vice President, Controller and
			Chief Accounting Officer

Page 51

INDEX TO EXHIBITS
Exhibit		Filing
Number	Description	Method

12	Statements re: computation of ratios
12.1	Computation of ratio of earnings to fixed charges.	Electronic
15	Letter re: unaudited interim financial information
15.1	Letter from KPMG LLP acknowledging awareness of the use of a report dated October 27, 2011 related to their review of interim financial information.	Electronic
31	Rule 13a-14(a)/15d-14(a) Certifications
31.1	Certification.	Electronic
31.2	Certification.	Electronic
32	Section 1350 Certifications
32.1	Certification.	Electronic
32.2	Certification.	Electronic
101	XBRL Documents
101.INS	XBRL Instance Document.	Electronic
101.SCH	XBRL Taxonomy Extension Schema.	Electronic
101.CAL	XBRL Taxonomy Extension Calculation Linkbase.	Electronic
101.DEF	XBRL Taxonomy Extension Definition Linkbase.	Electronic
101.LAB	XBRL Taxonomy Extension Label Linkbase.	Electronic
101.PRE	XBRL Taxonomy Extension Presentation Linkbase.	Electronic

Page 52

EX-12.1

Exhibit 12.1

Computation of Ratios

The computation of the ratio of earnings to fixed charges for the nine months ended September 30, 2011 and the years ended December 31, 2010, 2009, 2008, 2007 and 2006 are as follows:

	Nine Months Ended		Years Ended December 31,
(Millions)	September 30, 2011		2010		2009		2008		2007		2006
Income from continuing operations before income taxes	$	2,470.9	$	2,644.2	$	1,901.2	$	2,174.2	$	2,796.4	$	2,586.6
Add back fixed charges	220.5		307.7		302.9		297.9		234.3		199.5
Income as adjusted ("earnings")	$	2,691.4	$	2,951.9	$	2,204.1	$	2,472.1	$	3,030.7	$	2,786.1
Fixed charges:
Interest expense	$	187.3	$	254.6	$	243.4	$	236.4	$	180.6	$	148.3
Portion of rents representative of interest factor	33.2		53.1		59.5		61.5		53.7		51.2
Total fixed charges	$	220.5	$	307.7	$	302.9	$	297.9	$	234.3	$	199.5
Ratio of earnings to fixed charges	12.21		9.59		7.28		8.30		12.94		13.97

EX-15.1

Exhibit 15.1

Aetna Inc.

Hartford, Connecticut

Re: Registration Statement Nos. 333-52124, 52122, 52120, 73052, 87722, 87726, 124619, 124620, 136176, 136177, 155961, 168497, 168498, 176009 and 176011

With respect to the subject registration statements, we acknowledge our awareness of the use therein of our report dated October 27, 2011 related to our review of interim financial information.

Pursuant to Rule 436 under the Securities Act of 1933 (the Act), such report is not considered part of a registration statement prepared or certified by an independent registered public accounting firm, or a report prepared or certified by an independent registered public accounting firm within the meaning of Sections 7 and 11 of the Act.

/s/ KPMG LLP

Hartford, Connecticut

October 27, 2011

EX-31.1

Exhibit 31.1

Certification

I, Mark T. Bertolini, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Aetna Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	October 27, 2011	/s/ Mark T. Bertolini
		Mark T. Bertolini
		Chairman, Chief Executive Officer and President

EX-31.2

Exhibit 31.2

Certification

I, Joseph M. Zubretsky, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Aetna Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	October 27, 2011	/s/ Joseph M. Zubretsky
		Joseph M. Zubretsky
		Senior Executive Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

Certification

The certification set forth below is being submitted to the Securities and Exchange Commission in connection with the Quarterly Report on Form 10-Q of Aetna Inc. for the period ended September 30, 2011 (the “Report”) solely for the purpose of complying with Rule 13a-14(b) of the Securities Exchange Act of 1934 (the “Exchange Act”) and Section 1350 of Chapter 63 of Title 18 of the United States Code.

Mark T. Bertolini, Chairman, Chief Executive Officer and President of Aetna Inc., certifies that, to the best of his knowledge:

1. the Report fully complies with the requirements of Section 13(a) of the Exchange Act; and

2. the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Aetna Inc.

Date:	October 27, 2011	/s/ Mark T. Bertolini
		Mark T. Bertolini
		Chairman, Chief Executive Officer and President

EX-32.2

Exhibit 32.2

Certification

The certification set forth below is being submitted to the Securities and Exchange Commission in connection with the Quarterly Report on Form 10-Q of Aetna Inc. for the period ended September 30, 2011 (the “Report”) solely for the purpose of complying with Rule 13a-14(b) of the Securities Exchange Act of 1934 (the “Exchange Act”) and Section 1350 of Chapter 63 of Title 18 of the United States Code.

Joseph M. Zubretsky, Senior Executive Vice President and Chief Financial Officer of Aetna Inc., certifies that, to the best of his knowledge:

1. the Report fully complies with the requirements of Section 13(a) of the Exchange Act; and

2. the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Aetna Inc.

Date:	October 27, 2011	/s/ Joseph M. Zubretsky
		Joseph M. Zubretsky
		Senior Executive Vice President and Chief Financial Officer

XML

Investments Investments - Variable Interest Entities (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Variable Interest Entity, Not Primary Beneficiary, Disclosures [Abstract]
Long-term investments	$ 17,663,800,000		$ 17,663,800,000		$ 17,546,300,000
Noncontrolling Interest [Abstract]
Investment Holdings Partially Owned By Third Parties	71,000,000		71,000,000		74,000,000
Net Investment Gains Losses Related To Investment Holdings Partially Owned By Third Parties	(1,000,000)	1,000,000	2,000,000	2,000,000
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity, Not Primary Beneficiary, Disclosures [Abstract]
Long-term investments	171,000,000		171,000,000		153,000,000
Real Estate Partnerships [Member]
Variable Interest Entity, Not Primary Beneficiary, Disclosures [Abstract]
Assets of variable interest entities	5,200,000,000		5,200,000,000		5,100,000,000
Hedge Fund Partnerships [Member]
Variable Interest Entity, Not Primary Beneficiary, Disclosures [Abstract]
Assets of variable interest entities	$ 6,100,000,000		$ 6,100,000,000		$ 6,100,000,000.0

XML

Consolidated Statements of Income (Unaudited) (Parenthetical) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Income Statement [Abstract]
Administrative services contract member co-payments and plan sponsor reimbursements related to our mail order and specialty pharmacy operation, which are included in fees and other revenue.	$ 16.4	$ 22.3	$ 46.4	$ 60.5
Pharmaceutical and processing costs of our mail order and specialty pharmacy operations related to administrative services contracts.	317.1	360.3	938.0	1,100.0
Insured member co-payments related to our mail order and specialty pharmacy operations, which are a reduction of health care costs.	$ 31.4	$ 36.2	$ 101.0	$ 113.7

XML

Consolidated Balance Sheets (Unaudited) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 1,957.8	$ 1,867.6
Investments	2,042.7	2,169.7
Premiums receivable, net	807.8	661.9
Other receivables, net	766.6	692.6
Accrued investment income	196.4	203.4
Collateral received under securities loan agreements	0	210.6
Income taxes receivable	24.1	210.1
Deferred income taxes	403.9	327.0
Other current assets	686.6	651.3
Total current assets	6,885.9	6,994.2
Long-term investments	17,663.8	17,546.3
Reinsurance recoverables	926.8	960.1
Goodwill	6,010.3	5,146.4
Other acquired intangible assets, net	779.8	495.5
Property and equipment, net	533.0	529.3
Deferred income taxes	0	29.9
Other long-term assets	735.5	742.4
Separate Accounts assets	5,159.1	5,295.3
Total assets	38,694.2	37,739.4
Current liabilities:
Health care costs payable	2,509.1	2,630.9
Future policy benefits	704.4	728.4
Unpaid claims	578.6	593.3
Unearned premiums	794.2	318.7
Policyholders' funds	1,132.1	918.1
Collateral payable under securities loan agreements	0	210.8
Short-term debt	449.9	0
Current portion of long-term debt	0	899.9
Accrued expenses and other current liabilities	2,486.8	2,436.8
Total current liabilities	8,655.1	8,736.9
Future policy benefits	6,099.3	6,276.4
Unpaid claims	1,506.5	1,514.3
Policyholders' funds	1,357.4	1,316.6
Long-term debt, less current portion	3,977.1	3,482.6
Deferred income taxes	224.3	0
Other long-term liabilities	1,186.7	1,226.5
Separate Accounts liabilities	5,159.1	5,295.3
Total liabilities	28,165.5	27,848.6
Commitments and contingencies (Note 14)
Shareholders' equity:
Common stock ($.01 par value; 2.6 billion shares authorized and 362.3 million shares issued and outstanding in 2011; 2.7 billion shares authorized and 384.4 million shares issued and outstanding in 2010) and additional paid-in capital	909.6	651.5
Retained earnings	10,620.5	10,401.9
Accumulated other comprehensive loss	(1,001.4)	(1,162.6)
Total shareholders' equity	10,528.7	9,890.8
Total liabilities and shareholders' equity	$ 38,694.2	$ 37,739.4

XML

Financial Instruments - Fair Value Measurements (Details) (USD $) In Millions	Sep. 30, 2011		Dec. 31, 2010
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	$ 16,771.7	[1]	$ 16,961.6	[1]
Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	1,277.6		1,081.0
Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	15,235.6		15,610.9
Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	221.3		230.4
Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	16,734.5		16,922.3
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	1,277.6		1,081.0
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	251.1		292.7
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	0		0
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	1,528.7		1,373.7
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	0		0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	2,648.5		2,292.7
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	1.7		3.6
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	2,650.2		2,296.3
Domestic Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	0		0
Domestic Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	6,834.6		7,201.9
Domestic Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	61.7		60.7
Domestic Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	6,896.3		7,262.6
Foreign Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	0		0
Foreign Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	2,825.8		2,822.4
Foreign Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	54.8		54.9
Foreign Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	2,880.6		2,877.3
Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	0		0
Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	863.0		1,140.0
Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	0		0
Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	863.0		1,140.0
Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	0		0
Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	1,306.5		1,275.3
Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	28.7		36.9
Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	1,335.2		1,312.2
Other Asset-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	0		0
Other Asset-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	367.6		407.4
Other Asset-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	47.6		56.5
Other Asset-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	415.2		463.9
Redeemable Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	0		0
Redeemable Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	138.5		178.5
Redeemable Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	26.8		17.8
Redeemable Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	165.3		196.3
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	0.8		1.4
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	0		0
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	36.4		37.9
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	37.2		39.3
Fair Value, Measurements, Recurring [Member] | Brokered Securities [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	132.0		153.0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	0		0
Assets, Fair Value Disclosure	1,278.4		1,082.4
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liabilities, Fair Value Disclosure	0		0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	7.5		2.6
Assets, Fair Value Disclosure	15,243.1		15,613.5
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liabilities, Fair Value Disclosure	4.2		6.5
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	0		0
Assets, Fair Value Disclosure	257.7		268.3
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liabilities, Fair Value Disclosure	0		0
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	7.5		2.6
Assets, Fair Value Disclosure	16,779.2		16,964.2
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liabilities, Fair Value Disclosure	4.2		6.5
Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	16,734.5		16,922.3
US Government Agencies Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	1,528.7		1,373.7
US States and Political Subdivisions Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	2,650.2		2,296.3
Domestic Corporate Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	6,896.3		7,262.6
Foreign Corporate Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	2,880.6		2,877.3
Residential Mortgage Backed Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	863.0		1,140.0
Commercial Mortgage Backed Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	1,335.2		1,312.2
Other Asset-Backed Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	415.2		463.9
Redeemable Preferred Stock [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	165.3		196.3
Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Fair Value Disclosure	$ 37.2		$ 39.3

[1] Investment risks associated with our experience-rated and discontinued products generally do not impact our operating results (refer to Note 17 beginning on page 30 for additional information on our accounting for discontinued products). At September 30, 2011, debt and equity securities with a fair value of $4.1 billion, gross unrealized capital gains of $483.4 million and gross unrealized capital losses of $55.7 million and, at December 31, 2010, debt and equity securities with a fair value of $4.1 billion, gross unrealized capital gains of $339.5 million and gross unrealized capital losses of $38.1 million were included in total debt and equity securities, but support our experience-rated and discontinued products. Changes in net unrealized capital gains (losses) on these securities are not reflected in accumulated other comprehensive income

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Reinsurance

9 Months Ended

Sep. 30, 2011

Reinsurance Disclosures [Abstract]

Reinsurance

16. Reinsurance

In April 2011, we entered into three-year reinsurance agreements with Vitality Re II Limited, an unrelated insurer.  These agreements allow us to reduce our required statutory capital and provide an aggregate of $150 million of collateralized excess of loss reinsurance coverage on a portion of Aetna’s group Commercial Insured Health Care business.

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Document and Entity Information Document (USD $)	9 Months Ended
	Sep. 30, 2011	Jun. 30, 2010
Entity Information [Line Items]
Entity Registrant Name	AETNA INC /PA/
Entity Central Index Key	0001122304
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2011
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding	362,300,000
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float		$ 10,700,000,000

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Investments - Realized Gains (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Otti Losses On Securities	$ (3.7)	$ (9.0)	$ (8.2)	$ (32.7)
Portion Of Otti Losses Recognized In Other Comprehensive Income	0	6.0	0	12.7
Net Otti Losses On Securities Recognized In Earnings	(3.7)	(3.0)	(8.2)	(20.0)
Net Realized Capital Gains Losses Excluding Otti Losses On Securities	82.3	82.6	147.9	219.7
Realized Investment Gains (Losses)	78.6	79.6	139.7	199.7
Proceeds On Sales	1,927.1	2,373.3	5,019.0	5,938.3
Debt Securities [Member]
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Gross Realized Capital Gains	107.5	108.8	216.7	304.2
Gross Realized Capital Losses	$ (5.0)	$ (6.4)	$ (30.1)	$ (26.4)

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Earnings Per Common Share (Tables)

9 Months Ended

Sep. 30, 2011

Earnings Per Share [Abstract]

Earnings Per Share

The computations of basic and diluted EPS for the three and nine months ended September 30, 2011 and 2010 are as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(Millions, except per common share data)	2011		2010		2011		2010
Net income	$	490.4	$	497.6	$	1,613.1	$	1,551.2
Weighted average shares used to compute basic EPS	369.2		412.7		377.2		422.3
Dilutive effect of outstanding stock-based compensation awards (1)	7.6		6.1		7.8		7.2
Weighted average shares used to compute diluted EPS	376.8		418.8		385.0		429.5
Basic EPS	$	1.33	$	1.21	$	4.28	$	3.67
Diluted EPS	$	1.30	$	1.19	$	4.19	$	3.61

⁽¹⁾  Stock based compensation awards are not included in the calculation of diluted EPS if the exercise price is greater than the average market price of Aetna common shares during the period (i.e., the awards are anti-dilutive).  Approximately 12.6 million and 12.7 million stock appreciation rights were not included in the calculation of diluted EPS for the three and nine months ended September 30, 2011, respectively.  Approximately 18.6 million and 18.7 million stock appreciation rights and 5.7 million and 5.8 million stock options were not included in the calculation of diluted EPS for the three and nine months ended September 30, 2010, respectively. These stock based compensation awards were excluded from the calculation of diluted EPS because their effect was anti-dilutive.

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Investments - Unrealized Loss Position Maturities (Details) (USD $) In Millions	Sep. 30, 2011		Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	$ 133.3	[1]	$ 126.2	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	2,385.3	[1]	2,854.4	[1]
Maturing in Less than one Year [Member] | Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	2.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	140.8
Maturing in Less than one Year [Member] | Debt Securities [Member] | Supporting Discontinued And Experience Rated Products [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1.0
Maturing in Less than one Year [Member] | Debt Securities [Member] | Supporting Remaining Products [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	2.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	139.8
Maturing in One Through Five Years [Member] | Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	11.2
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	386.2
Maturing in One Through Five Years [Member] | Debt Securities [Member] | Supporting Discontinued And Experience Rated Products [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	1.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	54.7
Maturing in One Through Five Years [Member] | Debt Securities [Member] | Supporting Remaining Products [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	9.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	331.5
Maturing After Five Years Through Ten Years [Member] | Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	40.7
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	930.9
Maturing After Five Years Through Ten Years [Member] | Debt Securities [Member] | Supporting Discontinued And Experience Rated Products [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	12.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	258.4
Maturing After Five Years Through Ten Years [Member] | Debt Securities [Member] | Supporting Remaining Products [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	28.1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	672.5
Maturing in Greater Than Ten Years [Member] | Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	52.5
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	581.0
Maturing in Greater Than Ten Years [Member] | Debt Securities [Member] | Supporting Discontinued And Experience Rated Products [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	30.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	215.5
Maturing in Greater Than Ten Years [Member] | Debt Securities [Member] | Supporting Remaining Products [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	21.7
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	365.5
Residential Mortgage Backed Securities [Member] | Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	0.1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	3.1
Residential Mortgage Backed Securities [Member] | Debt Securities [Member] | Supporting Discontinued And Experience Rated Products [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	0
Residential Mortgage Backed Securities [Member] | Debt Securities [Member] | Supporting Remaining Products [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	0.1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	3.1
Commercial Mortgage Backed Securities [Member] | Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	14.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	307.1
Commercial Mortgage Backed Securities [Member] | Debt Securities [Member] | Supporting Discontinued And Experience Rated Products [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	2.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	51.2
Commercial Mortgage Backed Securities [Member] | Debt Securities [Member] | Supporting Remaining Products [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	11.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	255.9
Other Asset-Backed Securities [Member] | Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	4.1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	9.6
Other Asset-Backed Securities [Member] | Debt Securities [Member] | Supporting Discontinued And Experience Rated Products [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	0.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	5.0
Other Asset-Backed Securities [Member] | Debt Securities [Member] | Supporting Remaining Products [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	3.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	4.6
Debt Securities [Member] | Supporting Remaining Products [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	77.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,772.9
Debt Securities [Member] | Supporting Discontinued And Experience Rated Products [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	47.7
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	585.8
Supporting Discontinued And Experience Rated Products [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	55.7		38.1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	612.0		650.5
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	125.3	[1]	124.6	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 2,358.7	[1]	$ 2,844.4	[1]

[1] At September 30, 2011 and December 31, 2010, debt and equity securities in an unrealized capital loss position of $55.7 million and $38.1 million, respectively, and with related fair value of $612.0 million and $650.5 million, respectively, related to experience-rated and discontinued products

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Operating Expenses

9 Months Ended

Sep. 30, 2011

Operating Expenses [Abstract]

Operating Expenses

5. Operating Expenses

For the three and nine months ended September 30, 2011 and 2010, selling expenses (which include broker commissions, the variable component of our internal sales force compensation and premium taxes) and general and administrative expenses were as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(Millions)	2011		2010		2011		2010
Selling expenses	$	269.1	$	304.8	$	827.0	$	928.8
General and administrative expenses:
Salaries and related benefits (1)	918.0		761.6		2,468.6		2,292.3
Other general and administrative expenses (2)	629.2		487.7		1,675.9		1,408.3
Total general and administrative expenses	1,547.2		1,249.3		4,144.5		3,700.6
Total operating expenses	$	1,816.3	$	1,554.1	$	4,971.5	$	4,629.4

⁽¹⁾  Includes a one-time pretax charge of $137.0 million in the three and nine months ended September 30, 2011 related to the voluntary early retirement program that we announced in July 2011. Refer to the reconciliation of operating earnings to net income in Note 15 beginning on page 29 for additional information.

⁽²⁾  Includes litigation-related insurance proceeds of $41.0 million and $131.0 million for the three and nine months ended September 30, 2010, respectively.  Refer to the reconciliation of operating earnings to net income in Note 15 beginning on page 29 for additional information.

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Operating Expenses (Tables)

9 Months Ended

Sep. 30, 2011

Operating Expenses [Abstract]

Operating Expenses [Table Text Block]

For the three and nine months ended September 30, 2011 and 2010, selling expenses (which include broker commissions, the variable component of our internal sales force compensation and premium taxes) and general and administrative expenses were as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(Millions)	2011		2010		2011		2010
Selling expenses	$	269.1	$	304.8	$	827.0	$	928.8
General and administrative expenses:
Salaries and related benefits (1)	918.0		761.6		2,468.6		2,292.3
Other general and administrative expenses (2)	629.2		487.7		1,675.9		1,408.3
Total general and administrative expenses	1,547.2		1,249.3		4,144.5		3,700.6
Total operating expenses	$	1,816.3	$	1,554.1	$	4,971.5	$	4,629.4

⁽¹⁾  Includes a one-time pretax charge of $137.0 million in the three and nine months ended September 30, 2011 related to the voluntary early retirement program that we announced in July 2011. Refer to the reconciliation of operating earnings to net income in Note 15 beginning on page 29 for additional information.

⁽²⁾  Includes litigation-related insurance proceeds of $41.0 million and $131.0 million for the three and nine months ended September 30, 2010, respectively.  Refer to the reconciliation of operating earnings to net income in Note 15 beginning on page 29 for additional information.

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Investments (Details) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Total Investments [Line Items]
Current	$ 2,042.7	$ 2,169.7
Long-term investments	17,663.8	17,546.3
Total investments	19,706.5	19,716.0
Debt And Equity Securities Available For Sale [Member]
Total Investments [Line Items]
Current	1,986.2	2,111.9
Long-term investments	14,785.5	14,849.7
Total investments	16,771.7	16,961.6
Mortgage Loans [Member]
Total Investments [Line Items]
Current	49.0	55.2
Long-term investments	1,556.8	1,454.6
Total investments	1,605.8	1,509.8
Other Investments [Member]
Total Investments [Line Items]
Current	7.5	2.6
Long-term investments	1,321.5	1,242.0
Total investments	$ 1,329.0	$ 1,244.6

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Earnings Per Common Share (Details) (USD $) In Millions, except Per Share data	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 490.4		$ 497.6		$ 1,613.1		$ 1,551.2
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Weighted average shares used to compute basic EPS (in shares)	369.2		412.7		377.2		422.3
Dilutive effect of outstanding stock-based compensation awards (in shares)	7.6	[1]	6.1	[1]	7.8	[1]	7.2	[1]
Weighted average shares used to compute diluted EPS (in shares)	376.8		418.8		385.0		429.5
Basic EPS (in dollars per share)	$ 1.33		$ 1.21		$ 4.28		$ 3.67
Diluted EPS (in dollars per share)	$ 1.30		$ 1.19		$ 4.19		$ 3.61
Stock Appreciation Rights [Member]
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	12.6		18.6		12.7		18.7
Stock Options [Member]
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)			5.7				5.8

[1] Stock based compensation awards are not included in the calculation of diluted EPS if the exercise price is greater than the average market price of Aetna common shares during the period (i.e., the awards are anti-dilutive). Approximately 12.6 million and 12.7 million stock appreciation rights were not included in the calculation of diluted EPS for the three and nine months ended September 30, 2011, respectively. Approximately 18.6 million and 18.7 million stock appreciation rights and 5.7 million and 5.8 million stock options were not included in the calculation of diluted EPS for the three and nine months ended September 30, 2010, respectively. These stock based compensation awards were excluded from the calculation of diluted EPS because their effect was anti-dilutive.

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Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2011

Accounting Policies [Abstract]

Principles of Consolidation

Principles of Consolidation

These unaudited consolidated financial statements have been prepared in accordance with GAAP and include the accounts of Aetna and the subsidiaries that we control.  All significant intercompany balances have been eliminated in consolidation.

Troubled Debt Restructurings

Troubled Debt Restructurings

In April 2011, the Financial Accounting Standards Board (the “FASB”) released new accounting guidance and additional disclosure requirements relating to a creditor’s restructuring of receivables including mortgage loans.  The new guidance became effective beginning July 1, 2011.  Since we have no material problem, restructured or potential problem mortgage loans, the adoption of this accounting guidance did not have a material impact on our financial position or operating results.

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Pension and Other Postretirement Plans

9 Months Ended

Sep. 30, 2011

Compensation and Retirement Disclosure [Abstract]

Pension and Other Postretirement Plans

10. Pension and Other Postretirement Plans

Defined Benefit Retirement Plans

Components of the net periodic benefit (income) cost of our tax-qualified noncontributory defined benefit pension plans and other postretirement benefit (“OPEB”) plans for the three and nine months ended September 30, 2011 and 2010 were as follows:

	Pension Plans												OPEB Plans
	Three Months Ended						Nine Months Ended						Three Months Ended						Nine Months Ended
	September 30,						September 30,						September 30,						September 30,
(Millions)	2011			2010			2011			2010			2011			2010			2011			2010
Operating component:
Service cost	$	—		$	16.4		$	—		$	47.1		$	—		$	.1		$	.1		$	.2
Amortization of prior service cost	(.1		)	(.4		)	(.3		)	(1.5		)	(1.0		)	(1.0		)	(2.8		)	(2.8		)
Curtailment gain	—			(11.9		)	—			(11.9		)	—			—			—			—
Total operating component (1)	(.1		)	4.1			(.3		)	33.7			(1.0		)	(.9		)	(2.7		)	(2.6		)
Financing component:
Interest cost	78.0			74.9			234.2			228.2			4.2			4.5			12.5			13.4
Expected return on plan assets	(95.9		)	(87.8		)	(287.8		)	(264.3		)	(.9		)	(.9		)	(2.7		)	(2.7		)
Recognized net actuarial losses	14.6			40.9			43.8			141.4			1.3			1.1			3.7			3.4
Total financing component (1)	(3.3		)	28.0			(9.8		)	105.3			4.6			4.7			13.5			14.1
Net periodic benefit (income) cost	$	(3.4	)	$	32.1		$	(10.1	)	$	139.0		$	3.6		$	3.8		$	10.8		$	11.5

⁽¹⁾  The operating component of this expense is allocated to our business segments and the financing component is allocated to our Corporate Financing segment.  Our Corporate Financing segment is not a business segment but is added to our business segments to reconcile to our consolidated results.  Refer to Note 15 beginning on page 29 for additional information on our business segments.

On August 31, 2010, we announced that pension eligible employees would no longer earn future pension service credits in our tax-qualified noncontributory defined benefit pension plan (the "Aetna Pension Plan") effective December 31, 2010. The Aetna Pension Plan will continue to operate and account balances will continue to earn annual interest credits.

This announced change required a re-measurement of the Aetna Pension Plan's obligations and plan assets as of August 31, 2010. As a result of this re-measurement, our pension obligation increased by approximately $743 million (due primarily to a lower discount rate), accumulated other comprehensive income decreased by approximately $836 million ($543 million after tax), and the fair value of plan assets increased by approximately $156 million. In performing this re-measurement, we used a discount rate of 4.77%, consistent with our methodology for determining the discount rate using a yield curve, and an expected long-term rate of return of 7.5%. Additionally, as a result of this re-measurement, we revised the amortization period we use for actuarial gains and losses from 9 years to 31 years, reflecting the estimated average remaining participation period for current participants.

These actions also resulted in $12 million of one-time curtailment gains in the third quarter of 2010 and lower pension cost for the three and nine months ended September 30, 2011 compared to the corresponding periods in 2010.

In addition, during the third quarters of 2011 and 2010, we made $60 million and $505 million, respectively, in voluntary cash contributions to the Aetna Pension Plan.

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Organization

9 Months Ended

Sep. 30, 2011

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization

1. Organization

We conduct our operations in three business segments:

• Health Care consists of medical, pharmacy benefits management, dental and vision plans offered on both an Insured basis (where we assume all or a majority of the risk for medical and dental care costs) and an employer-funded basis (where the plan sponsor under an administrative services contract (“ASC”) assumes all or a majority of this risk).  Medical products include point-of-service (“POS”), preferred provider organization (“PPO”), health maintenance organization (“HMO”) and indemnity benefit plans.  Medical products also include health savings accounts (“HSAs”) and Aetna HealthFund^®, consumer-directed health plans that combine traditional POS or PPO and/or dental coverage, subject to a deductible, with an accumulating benefit account (which may be funded by the plan sponsor and/or the member in the case of HSAs).  We also offer Medicare and Medicaid products and services and specialty products, such as health information exchange technology services, medical management and data analytics services, behavioral health plans and stop loss insurance, as well as products that provide access to our provider network in select geographies.

• Group Insurance primarily includes group life insurance products offered on an Insured basis, including basic and supplemental group term life, group universal life, supplemental or voluntary programs and accidental death and dismemberment coverage.  Group Insurance also includes: (i) group disability products offered to employers on both an Insured and an ASC basis which consist primarily of short-term and long-term disability insurance, (ii) absence management services offered to employers, which include short-term and long-term disability administration and leave management, and (iii) long-term care products that were offered primarily on an Insured basis, which provide benefits covering the cost of care in private home settings, adult day care, assisted living or nursing facilities.  We no longer solicit or accept new long-term care customers.

• Large Case Pensions manages a variety of retirement products (including pension and annuity products) primarily for tax qualified pension plans.  These products provide a variety of funding and benefit payment distribution options and other services.  Large Case Pensions also includes certain discontinued products (refer to Note 17 beginning on page 30 for additional information).

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Segment Information (Tables)

9 Months Ended

Sep. 30, 2011

Segment Reporting [Abstract]

Summarized financial information of segments

Summarized financial information of our segments for the three and nine months ended September 30, 2011 and 2010 was as follows:

(Millions)	Health Care		Group Insurance		Large Case Pensions		Corporate Financing			Total Company
Three Months Ended September 30, 2011
Revenue from external customers	$	7,695.9	$	426.6	$	40.6	$	—		$	8,163.1
Operating earnings (loss) (1)	525.7		37.9		4.4		(39.6		)	528.4
Three Months Ended September 30, 2010
Revenue from external customers	$	7,733.3	$	436.2	$	41.5	$	—		$	8,211.0
Operating earnings (loss) (1)	442.2		34.6		5.6		(62.8		)	419.6
Nine Months Ended September 30, 2011
Revenue from external customers	$	22,919.1	$	1,288.1	$	133.1	$	—		$	24,340.3
Operating earnings (loss) (1)	1,593.9		125.2		16.4		(124.1		)	1,611.4
Nine Months Ended September 30, 2010
Revenue from external customers	$	23,258.1	$	1,345.5	$	125.7	$	—		$	24,729.3
Operating earnings (loss) (1)	1,369.7		107.5		21.4		(198.2		)	1,300.4

⁽¹⁾  Operating earnings (loss) excludes net realized capital gains or losses and the other items described in the reconciliation on page 30.

Reconciliation of Operating Earnings to Net Income

A reconciliation of operating earnings ⁽¹⁾ to net income for the three and nine months ended September 30, 2011 and 2010 was as follows:

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
(Millions)	2011			2010		2011			2010
Operating earnings	$	528.4		$	419.6	$	1,611.4		$	1,300.4
Voluntary early retirement program	(89.1		)	—		(89.1		)	—
Litigation-related insurance proceeds	—			26.6		—			85.1
Net realized capital gains	51.1			51.4		90.8			165.7
Net income	$	490.4		$	497.6	$	1,613.1		$	1,551.2

⁽¹⁾  In addition to net realized capital gains, the following items are excluded from operating earnings because we believe they neither relate to the ordinary course of our business nor reflect our underlying business performance:

^•  In July 2011, we announced a voluntary early retirement program (the "Program").  In connection with the Program, we recorded a one-time charge of $89.1 million ($137.0 million pretax) during the three and nine months ended September 30, 2011.

^•  Following a Pennsylvania Supreme Court ruling in June 2009, we recorded litigation-related insurance proceeds of $26.6 million ($41.0 million pretax) and $85.1 million ($131.0 million pretax) for the three and nine months ended September 30, 2010, respectively, from our liability insurers related to certain litigation we settled in 2003.  

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Investments

9 Months Ended

Sep. 30, 2011

Investments [Abstract]

Investments

7. Investments

Total investments at September 30, 2011 and December 31, 2010 were as follows:

	September 30, 2011						December 31, 2010
(Millions)	Current		Long-term		Total		Current		Long-term		Total
Debt and equity securities available for sale	$	1,986.2	$	14,785.5	$	16,771.7	$	2,111.9	$	14,849.7	$	16,961.6
Mortgage loans	49.0		1,556.8		1,605.8		55.2		1,454.6		1,509.8
Other investments	7.5		1,321.5		1,329.0		2.6		1,242.0		1,244.6
Total investments	$	2,042.7	$	17,663.8	$	19,706.5	$	2,169.7	$	17,546.3	$	19,716.0

Debt and Equity Securities

Debt and equity securities available for sale at September 30, 2011 and December 31, 2010 were as follows:

(Millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses				Fair Value
September 30, 2011
Debt securities:
U.S. government securities	$	1,358.0	$	171.1	$	(.4	)		$	1,528.7
States, municipalities and political subdivisions	2,470.5		184.6		(4.9		)		2,650.2
U.S. corporate securities	6,268.4		671.5		(43.6		)		6,896.3
Foreign securities	2,664.0		259.7		(43.1		)		2,880.6
Residential mortgage-backed securities	811.3		51.8		(.1		)	(1)	863.0
Commercial mortgage-backed securities	1,269.4		80.1		(14.3		)	(1)	1,335.2
Other asset-backed securities	397.9		21.4		(4.1		)	(1)	415.2
Redeemable preferred securities	168.9		11.2		(14.8		)		165.3
Total debt securities	15,408.4		1,451.4		(125.3		)		16,734.5
Equity securities	40.2		5.0		(8.0		)		37.2
Total debt and equity securities (2)	$	15,448.6	$	1,456.4	$	(133.3	)		$	16,771.7
December 31, 2010
Debt securities:
U.S. government securities	$	1,293.5	$	80.8	$	(.6	)		$	1,373.7
States, municipalities and political subdivisions	2,288.8		54.4		(46.9		)		2,296.3
U.S. corporate securities	6,731.5		553.0		(21.9		)		7,262.6
Foreign securities	2,667.4		231.1		(21.2		)		2,877.3
Residential mortgage-backed securities	1,089.2		53.6		(2.8		)	(1)	1,140.0
Commercial mortgage-backed securities	1,226.4		99.5		(13.7		)	(1)	1,312.2
Other asset-backed securities	447.6		21.1		(4.8		)	(1)	463.9
Redeemable preferred securities	196.7		12.3		(12.7		)		196.3
Total debt securities	15,941.1		1,105.8		(124.6		)		16,922.3
Equity securities	35.3		5.6		(1.6		)		39.3
Total debt and equity securities (2)	$	15,976.4	$	1,111.4	$	(126.2	)		$	16,961.6

⁽¹⁾  At September 30, 2011 and December 31, 2010, we held securities for which we recognized $28.0 million and $38.3 million, respectively, of non-credit-related impairments in other comprehensive income in the past. These securities had a net unrealized capital gain at September 30, 2011 and December 31, 2010 of $8.2 million and $3.9 million, respectively.

⁽²⁾  Investment risks associated with our experience-rated and discontinued products generally do not impact our operating results (refer to Note 17 beginning on page 30 for additional information on our accounting for discontinued products).  At September 30, 2011, debt and equity securities with a fair value of $4.1 billion, gross unrealized capital gains of $483.4 million and gross unrealized capital losses of $55.7 million and, at December 31, 2010, debt and equity securities with a fair value of $4.1 billion, gross unrealized capital gains of $339.5 million and gross unrealized capital losses of $38.1 million were included in total debt and equity securities, but support our experience-rated and discontinued products.  Changes in net unrealized capital gains (losses) on these securities are not reflected in accumulated other comprehensive income.

The fair value of debt securities at September 30, 2011 is shown below by contractual maturity.  Actual maturities may differ from contractual maturities because securities may be restructured, called or prepaid.

(Millions)	Fair Value
Due to mature:
Less than one year	$	694.5
One year through five years	3,018.1
After five years through ten years	5,213.8
Greater than ten years	5,194.7
Residential mortgage-backed securities	863.0
Commercial mortgage-backed securities	1,335.2
Other asset-backed securities	415.2
Total	$	16,734.5

Mortgage-Backed and Other Asset-Backed Securities

All of our residential mortgage-backed securities at September 30, 2011 were issued by the Government National Mortgage Association, the Federal National Mortgage Association or the Federal Home Loan Mortgage Corporation and carry agency guarantees and explicit or implicit guarantees by the U.S. Government.  At September 30, 2011, our residential mortgage-backed securities had an average quality rating of AAA and a weighted average duration of 1.9 years.

Our commercial mortgage-backed securities have underlying loans that are dispersed throughout the U.S.  Significant market observable inputs used to value these securities include probability of default and loss severity.  At September 30, 2011, these securities had an average quality rating of AA+ and a weighted average duration of 3.7 years.

Our other asset-backed securities have a variety of underlying collateral (e.g., automobile loans, credit card receivables and home equity loans).  Significant market observable inputs used to value these securities include the unemployment rate, loss severity and probability of default.  At September 30, 2011, these securities had an average quality rating of AA and a weighted average duration of 3.4 years.

Unrealized Capital Losses and Net Realized Capital Gains (Losses)

When a debt or equity security is in an unrealized capital loss position, we monitor the duration and severity of the loss to determine if sufficient market recovery can occur within a reasonable period of time.  We recognize an other-than-temporary impairment (“OTTI”) when we intend to sell a debt security that is in an unrealized capital loss position or if we determine a credit-related loss on a debt or equity security has occurred.

Summarized below are the debt and equity securities we held at September 30, 2011 and December 31, 2010 that were in an unrealized capital loss position, aggregated by the length of time the investments have been in that position:

	Less than 12 months				Greater than 12 months				Total (1)
(Millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
September 30, 2011
Debt securities:
U.S. government securities	$	50.9	$	.1	$	15.1	$	.3	$	66.0	$	.4
States, municipalities and political subdivisions	90.8		1.0		93.4		3.9		184.2		4.9
U.S. corporate securities	947.2		40.7		74.1		2.9		1,021.3		43.6
Foreign securities	659.0		34.8		34.4		8.3		693.4		43.1
Residential mortgage-backed securities	—		—		3.1		.1		3.1		.1
Commercial mortgage-backed securities	263.9		9.0		43.2		5.3		307.1		14.3
Other asset-backed securities	5.7		.3		3.9		3.8		9.6		4.1
Redeemable preferred securities	38.5		1.7		35.5		13.1		74.0		14.8
Total debt securities	2,056.0		87.6		302.7		37.7		2,358.7		125.3
Equity securities	15.9		7.6		10.7		.4		26.6		8.0
Total debt and equity securities (1)	$	2,071.9	$	95.2	$	313.4	$	38.1	$	2,385.3	$	133.3
December 31, 2010
Debt securities:
U.S. government securities	$	8.4	$	.2	$	19.8	$	.4	$	28.2	$	.6
States, municipalities and political subdivisions	964.9		37.6		82.7		9.3		1,047.6		46.9
U.S. corporate securities	665.8		17.0		210.2		4.9		876.0		21.9
Foreign securities	375.9		14.6		34.6		6.6		410.5		21.2
Residential mortgage-backed securities	103.7		2.6		6.6		.2		110.3		2.8
Commercial mortgage-backed securities	103.7		2.4		78.5		11.3		182.2		13.7
Other asset-backed securities	85.9		2.0		4.9		2.8		90.8		4.8
Redeemable preferred securities	4.5		—		94.3		12.7		98.8		12.7
Total debt securities	2,312.8		76.4		531.6		48.2		2,844.4		124.6
Equity securities	.5		—		9.5		1.6		10.0		1.6
Total debt and equity securities (1)	$	2,313.3	$	76.4	$	541.1	$	49.8	$	2,854.4	$	126.2

⁽¹⁾  At September 30, 2011 and December 31, 2010, debt and equity securities in an unrealized capital loss position of $55.7 million and $38.1 million, respectively, and with related fair value of $612.0 million and $650.5 million, respectively, related to experience-rated and discontinued products.

We reviewed the securities in the tables above and concluded that these are performing assets generating investment income to support the needs of our business.  In performing this review, we considered factors such as the quality of the investment security based on research performed by our internal credit analysts and external rating agencies and the prospects of realizing the carrying value of the security based on the investment’s current prospects for recovery.  At September 30, 2011, we did not have the intention to sell the debt securities that were in an unrealized capital loss position.

The maturity dates for debt securities in an unrealized capital loss position at September 30, 2011 were as follows:

	Supporting discontinued and experience-rated products				Supporting remaining products				Total
(Millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Due to mature:
Less than one year	$	1.0	$	—	$	139.8	$	2.4	$	140.8	$	2.4
One year through five years	54.7		1.6		331.5		9.6		386.2		11.2
After five years through ten years	258.4		12.6		672.5		28.1		930.9		40.7
Greater than ten years	215.5		30.8		365.5		21.7		581.0		52.5
Residential mortgage-backed securities	—		—		3.1		.1		3.1		.1
Commercial mortgage-backed securities	51.2		2.4		255.9		11.9		307.1		14.3
Other asset-backed securities	5.0		.3		4.6		3.8		9.6		4.1
Total	$	585.8	$	47.7	$	1,772.9	$	77.6	$	2,358.7	$	125.3

Net realized capital gains for the three and nine months ended September 30, 2011 and 2010, excluding amounts related to experience-rated contract holders and discontinued products, were as follows:

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
(Millions)	2011			2010			2011			2010
OTTI losses on debt securities	$	(3.7	)	$	(9.0	)	$	(8.2	)	$	(32.7	)
Portion of OTTI losses on debt securities recognized   in other comprehensive income	—			6.0			—			12.7
Net OTTI losses on debt securities recognized in earnings	(3.7		)	(3.0		)	(8.2		)	(20.0		)
Net realized capital gains, excluding OTTI losses on debt securities	82.3			82.6			147.9			219.7
Net realized capital gains	$	78.6		$	79.6		$	139.7		$	199.7

The net realized capital gains for the three and nine months ended September 30, 2011 and 2010 were primarily attributable to the sale of debt securities, partially offset by losses from derivative transactions.

Excluding amounts related to experience-rated and discontinued products, proceeds from the sale of debt securities and the related gross realized capital gains and losses for the three and nine months ended September 30, 2011 and 2010 were as follows:

	For the Three Months Ended						For the Nine Months Ended
	September 30,						September 30,
(Millions)	2011			2010			2011			2010
Proceeds on sales	$	1,927.1		$	2,373.3		$	5,019.0		$	5,938.3
Gross realized capital gains	107.5			108.8			216.7			304.2
Gross realized capital losses	(5.0		)	(6.4		)	(30.1		)	(26.4		)

Mortgage loans

Our mortgage loans are collateralized by commercial real estate.  During the three and nine months ended September 30, 2011 and 2010 we had the following activity in our mortgage loan portfolio:

	For the Three Months Ended				For the Nine Months Ended
	September 30,				September 30,
(Millions)	2011		2010		2011		2010
New mortgage loans	$	56.1	$	37.9	$	184.6	$	53.2
Mortgage loans fully repaid	15.4		21.2		54.6		74.3
Mortgage loans foreclosed	—		8.5		—		20.0

At September 30, 2011 and December 31, 2010, we had no material problem, restructured or potential problem mortgage loans.  We also had no material impairment reserves on these loans at September 30, 2011 or December 31, 2010.

We assess our mortgage loans on a regular basis for credit impairments, and annually we assign a credit quality indicator to each loan.  Our credit quality indicator is internally developed and categorizes our portfolio on a scale from 1 to 7.  Category 1 represents loans of superior quality, and Categories 6 and 7 represent loans where collections are at risk.  Most of our mortgage loans fall into the Level 2 to 4 ratings.  These ratings represent loans where credit risk is minimal to acceptable; however, these loans may display some susceptibility to economic changes.  Category 5 represents loans where credit risk is not substantial but these loans warrant management’s close attention.  These indicators are based upon several factors, including current loan to value ratios, property condition, market trends, borrower quality and deal structure.  Based upon our most recent assessment at September 30, 2011 and December 31, 2010, our mortgage loans were given the following credit quality indicators:

(In Millions)	September 30, 2011		December 31, 2010
1	$	104.5	$	99.4
2 to 4	1,374.7		1,301.5
5	91.3		86.1
6 and 7	35.3		22.8
Total	$	1,605.8	$	1,509.8

Variable Interest Entities

In determining whether to consolidate a variable interest entity ("VIE"), we consider several factors including whether we have the power to direct activities, the obligation to absorb losses and the right to receive benefits that could potentially be significant to the VIE.  We have relationships with certain real estate and hedge fund partnerships that are considered VIEs, but are not consolidated.  We record the amount of our investment in these partnerships as long-term investments on our balance sheets and recognize our share of partnership income or losses in earnings.  Our maximum exposure to loss as a result of our investment in these partnerships is our investment balance at September 30, 2011 and December 31, 2010 of approximately $171 million and $153 million, respectively, and the risk of recapture of tax credits related to the real estate partnerships previously recognized, which we do not consider significant.  We do not have a future obligation to fund losses or debts on behalf of these investments; however, we may voluntarily contribute funds.  The real estate partnerships construct, own and manage low-income housing developments and had total assets of approximately $5.2 billion and $5.1 billion at September 30, 2011 and December 31, 2010, respectively.  The hedge fund partnerships had total assets of approximately $6.1 billion at both September 30, 2011 and December 31, 2010.

Non-controlling Interests

Certain of our investment holdings are partially-owned by third parties.  At September 30, 2011 and December 31, 2010, approximately $71 million and $74 million, respectively, of our investment holdings were owned by third parties.  The non-controlling entities’ share of these investments was included in accrued expenses and other current liabilities.  Net (loss) income attributable to these interests was $(1) million and $2 million for the three and nine months ended September 30, 2011, respectively, and $1 million and $2 million for the three and nine months ended September 30, 2010, respectively.  These non-controlling interests did not have a material impact on our financial position or operating results.

Net Investment Income

Sources of net investment income for the three and nine months ended September 30, 2011 and 2010 were as follows:

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
(Millions)	2011			2010			2011			2010
Debt securities	$	205.1		$	225.8		$	628.5		$	694.3
Mortgage loans	26.5			25.4			75.8			78.4
Other investments	9.5			4.4			45.4			25.5
Gross investment income	241.1			255.6			749.7			798.2
Less:  investment expenses	(7.5		)	(7.4		)	(22.2		)	(21.1		)
Net investment income (1)	$	233.6		$	248.2		$	727.5		$	777.1

⁽¹⁾  Investment risks associated with our experience-rated and discontinued products generally do not impact our operating results (refer to Note 17 beginning on page 30 for additional information on our accounting for discontinued products).  Net investment income includes $85.8 million and $252.8 million for the three and nine months ended September 30, 2011, respectively, and $78.3 million and $246.7 million for the three and nine months ended September 30, 2010, respectively, related to investments supporting our experience-rated and discontinued products.

The decrease in net investment income during the three and nine months ended September 30, 2011 was primarily a result of lower average yields and lower average asset levels partially offset by higher returns on our alternative investments.

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Capital Stock

9 Months Ended

Sep. 30, 2011

Class of Stock Disclosures [Abstract]

Capital Stock

12. Capital Stock

Our Board of Directors (our "Board") authorized three separate share repurchase programs on December 3, 2010, May 20, 2011 and September 23, 2011, respectively. Each repurchase program authorized us to repurchase up to $750 million of our common stock.  During the nine months ended September 30, 2011, we repurchased approximately 31 million shares of common stock at a cost of approximately $1.2 billion.  At September 30, 2011, we had remaining authorization to repurchase an aggregate of up to approximately $1 billion of common stock under the May 20, 2011 and September 23, 2011 programs.

In February 2011, we announced that our Board increased our cash dividend to shareholders to $.15 per share and moved us to a quarterly dividend payment cycle.  Prior to February 2011, our policy had been to pay an annual dividend of $.04 per share.

During the nine months ended September 30, 2011 our Board declared the following cash dividends:

Date Declared	Dividend Amount Per Share		Stockholders of Record Date	Date Paid/ To be Paid	Total Dividends (Millions)
February 3, 2011	$	.15	April 14, 2011	April 29, 2011	$	57.0
May 20, 2011	.15		July 14, 2011	July 29, 2011	55.9
September 23, 2011	.15		October 13, 2011	October 28, 2011	54.3

Declaration and payment of future dividends is at the discretion of our Board and may be adjusted as business needs or market conditions change.

On February 7, 2011, approximately .6 million performance stock units (“PSUs”), 1.2 million market stock units (“MSUs”) and 1.0 million restricted stock units (“RSUs”) were granted to certain employees.  The number of vested PSUs (which could range from zero to 200% of the original number of units granted) is dependent upon the degree to which we achieve performance goals during the performance period as determined by our Board’s Committee on Compensation and Organization.  The performance period for the PSUs ends on December 31, 2011, and the vesting period ends on December 7, 2012.   The number of vested MSUs (which could range from zero to 150% of the original number of units granted) is based on the change between the closing price of our common stock on the grant date and the weighted average closing price of our common stock for the thirty trading days prior to the vesting date.  The MSUs have a twenty-two month vesting period.  Each vested PSU, MSU and RSU represents one share of common stock and will be paid in shares of common stock, net of taxes, at the end of the vesting period.  The RSUs will become 100% vested approximately three years from the grant date, with one-third vesting each December.

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Other Comprehensive (Loss) Income

9 Months Ended

Sep. 30, 2011

Other Comprehensive Income (Loss), Net of Tax [Abstract]

Other Comprehensive (Loss) Income

8. Other Comprehensive (Loss) Income

Shareholders’ equity included the following activity in accumulated other comprehensive loss (excluding amounts related to experience-rated contract holders and discontinued products) for the nine months ended September 30, 2011 and 2010:

	Net Unrealized Gains (Losses)											Pension and OPEB Plans							Total Accumulated Other Comprehensive (Loss) Income
	Securities						Foreign Currency and Derivatives
(Millions)	Previously Impaired (1)			All Other							Unrecognized Net Actuarial Losses				Unrecognized Prior Service Cost
Nine months ended September 30, 2011
Balance at December 31, 2010	$	75.1		$	375.2			$	(27.3	)		$	(1,614.0	)		$	28.4			$	(1,162.6	)
Net unrealized gains (losses) ($376.6 pretax)	.7			251.9				(7.8		)		—				—				244.8
Reclassification to earnings ($128.6 pretax)	(16.8		)	(97.7		)		2.1				30.8				(2.0		)		(83.6		)
Other comprehensive (loss) income	(16.1		)	154.2				(5.7		)		30.8				(2.0		)		161.2
Balance at September 30, 2011	$	59.0		$	529.4			$	(33.0	)		$	(1,583.2	)		$	26.4			$	(1,001.4	)
Nine months ended September 30, 2010
Balance at December 31, 2009	$	100.3		$	235.7			$	25.3			$	(1,623.8	)		$	39.5			$	(1,223.0	)
Net unrealized gains (losses) ($5.7 pretax)	51.2			549.9				(53.8		)		(543.6		)		—				3.7
Reclassification to earnings ($149.1 pretax)	(67.5		)	(159.1		)		.5				94.3				(10.5		)		(142.3		)
Other comprehensive (loss) income	(16.3		)	390.8				(53.3		)		(449.3		)		(10.5		)		(138.6		)
Balance at September 30, 2010	$	84.0		$	626.5			$	(28.0	)		$	(2,073.1	)		$	29.0			$	(1,361.6	)

⁽¹⁾  Represents unrealized losses on the non-credit-related component of impaired debt securities that we do not intend to sell and subsequent appreciation in the fair value of those securities as well as those that we intend to sell.

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Pension and Other Postretirement Plans (Tables)

9 Months Ended

Sep. 30, 2011

Compensation and Retirement Disclosure [Abstract]

Components of net periodic benefit cost

Components of the net periodic benefit (income) cost of our tax-qualified noncontributory defined benefit pension plans and other postretirement benefit (“OPEB”) plans for the three and nine months ended September 30, 2011 and 2010 were as follows:

	Pension Plans												OPEB Plans
	Three Months Ended						Nine Months Ended						Three Months Ended						Nine Months Ended
	September 30,						September 30,						September 30,						September 30,
(Millions)	2011			2010			2011			2010			2011			2010			2011			2010
Operating component:
Service cost	$	—		$	16.4		$	—		$	47.1		$	—		$	.1		$	.1		$	.2
Amortization of prior service cost	(.1		)	(.4		)	(.3		)	(1.5		)	(1.0		)	(1.0		)	(2.8		)	(2.8		)
Curtailment gain	—			(11.9		)	—			(11.9		)	—			—			—			—
Total operating component (1)	(.1		)	4.1			(.3		)	33.7			(1.0		)	(.9		)	(2.7		)	(2.6		)
Financing component:
Interest cost	78.0			74.9			234.2			228.2			4.2			4.5			12.5			13.4
Expected return on plan assets	(95.9		)	(87.8		)	(287.8		)	(264.3		)	(.9		)	(.9		)	(2.7		)	(2.7		)
Recognized net actuarial losses	14.6			40.9			43.8			141.4			1.3			1.1			3.7			3.4
Total financing component (1)	(3.3		)	28.0			(9.8		)	105.3			4.6			4.7			13.5			14.1
Net periodic benefit (income) cost	$	(3.4	)	$	32.1		$	(10.1	)	$	139.0		$	3.6		$	3.8		$	10.8		$	11.5

⁽¹⁾  The operating component of this expense is allocated to our business segments and the financing component is allocated to our Corporate Financing segment.  Our Corporate Financing segment is not a business segment but is added to our business segments to reconcile to our consolidated results.  Refer to Note 15 beginning on page 29 for additional information on our business segments.

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Goodwill and Other Acquired Intangible Assets

9 Months Ended

Sep. 30, 2011

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Acquired Intangible Assets

6. Goodwill and Other Acquired Intangible Assets

The increase in goodwill for the nine months ended September 30, 2011 and 2010 is as follows:

(Millions)	2011		2010
Balance, beginning of the period	$	5,146.4	$	5,146.2
Goodwill acquired:
Prodigy (1)	445.0		—
Medicity	393.5		—
Other (1)	25.4		(.5		)
Balance, end of the period	$	6,010.3	$	5,145.7

⁽¹⁾  Goodwill related to these acquisitions is considered preliminary, pending the final allocation of the applicable purchase price.

Other acquired intangible assets at September 30, 2011 and December 31, 2010 were comprised of the following:

(Millions)	Cost		Accumulated Amortization			Net Balance		Amortization Period (Years)
September 30, 2011
Provider networks	$	703.2		$	421.3	$	281.9		12-25	(1)
Customer lists	661.4			313.9		347.5			4-10	(1)
Technology	120.9			32.6		88.3			3-10
Other	21.8			16.9		4.9			2-15
Definite-lived trademarks	47.6			12.7		34.9			2-15
Indefinite-lived trademarks	22.3			—		22.3
Total other acquired intangible assets	$	1,577.2		$	797.4	$	779.8
December 31, 2010
Provider networks	$	703.2		$	398.9	$	304.3		12-25	(1)
Customer lists	420.4			262.6		157.8			4-10	(1)
Technology	25.3			25.0		.3			3-5
Other	17.1			16.8		.3			2-15
Definite-lived trademarks	21.0			10.5		10.5			2-15
Indefinite-lived trademarks	22.3			—		22.3
Total other acquired intangible assets	$	1,209.3		$	713.8	$	495.5

⁽¹⁾  The amortization period for our provider networks and customer lists includes an assumption of renewal or extension of these arrangements.  At September 30, 2011 and December 31, 2010, the periods prior to next renewal or extension for our provider networks primarily ranged from 1 to 3 years. At September 30, 2011 and December 31, 2010, the period prior to the next renewal or extension for our customer lists was approximately one year. Any costs related to the renewal or extension of these contracts is expensed as incurred.

The value assigned to other acquired intangible assets for acquisitions completed during the nine months ended September 30, 2011, primarily for customer lists and technology intangibles, totaled $367.9 million, of which $227.0 million is preliminary pending the finalization of purchase price allocations.

We estimate annual pretax amortization for other acquired intangible assets for 2011 and over the next five years to be as follows:

(Millions)
2011	$	114.5
2012	115.7
2013	106.5
2014	87.4
2015	72.1
2016	68.2

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Other Comprehensive (Loss) Income (Details) (USD $) In Millions	9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	$ (1,162.6)
Other comprehensive (loss) income	161.2		(138.6)
Balance at end of period	(1,001.4)
Unrealized net gains (losses) arising during the period, pre-tax	376.6		5.7
Reclassification to earnings, pre-tax	128.6		149.1
Net Unrealized Gains (Losses) Previously Impaired Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	75.1	[1]	100.3	[1]
Net unrealized gains (losses)	0.7	[1]	51.2	[1]
Reclassification to earnings	(16.8)	[1]	(67.5)	[1]
Other comprehensive (loss) income	(16.1)	[1]	(16.3)	[1]
Balance at end of period	59.0	[1]	84.0	[1]
Net Unrealized Gains (Losses) All Other Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	375.2		235.7
Net unrealized gains (losses)	251.9		549.9
Reclassification to earnings	(97.7)		(159.1)
Other comprehensive (loss) income	154.2		390.8
Balance at end of period	529.4		626.5
Net Unrealized Gains (Losses) Foreign Currency And Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(27.3)		25.3
Net unrealized gains (losses)	(7.8)		(53.8)
Reclassification to earnings	2.1		0.5
Other comprehensive (loss) income	(5.7)		(53.3)
Balance at end of period	(33.0)		(28.0)
Pension And Opeb Plans Unrecognized Net Actuarial (Losses) [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(1,614.0)		(1,623.8)
Net unrealized gains (losses)	0		(543.6)
Reclassification to earnings	30.8		94.3
Other comprehensive (loss) income	30.8		(449.3)
Balance at end of period	(1,583.2)		(2,073.1)
Pension And Opeb Plans Unrecognized Prior Service Cost [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	28.4		39.5
Net unrealized gains (losses)	0		0
Reclassification to earnings	(2.0)		(10.5)
Other comprehensive (loss) income	(2.0)		(10.5)
Balance at end of period	26.4		29.0
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(1,162.6)		(1,223.0)
Net unrealized gains (losses)	244.8		3.7
Reclassification to earnings	(83.6)		(142.3)
Other comprehensive (loss) income	161.2		(138.6)
Balance at end of period	$ (1,001.4)		$ (1,361.6)

[1] Represents unrealized losses on the non-credit-related component of impaired debt securities that we do not intend to sell and subsequent appreciation in the fair value of those securities as well as those that we intend to sell.

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Consolidated Statements of Shareholders' Equity (Unaudited) (USD $) In Millions, except Share data	Total USD ($)	Common Stock [Member]	Common Stock Including Additional Paid in Capital [Member] USD ($)	Retained Earnings [Member] USD ($)	Accumulated Other Comprehensive Loss [Member] USD ($)	Comprehensive Income [Member] USD ($)
Balance at beginning of period at Dec. 31, 2009	$ 9,503.8		$ 470.1	$ 10,256.7	$ (1,223.0)
Balance at beginning of period (in shares) at Dec. 31, 2009		430,800,000
Comprehensive income:
Net income	1,551.2		0	1,551.2	0	1,551.2
Other comprehensive income (loss) (Note 8):
Net unrealized gains on securities	374.5		0	0	374.5
Net foreign currency and derivative losses	(53.3)		0	0	(53.3)
Pension and OPEB plans	(459.8)		0	0	(459.8)
Other comprehensive (loss) income	(138.6)		0	0	(138.6)	(138.6)
Total comprehensive income						1,412.6
Common shares issued for benefit plans, including tax benefits	103.7		103.7	0	0
Common shares issued for benefit plans, including tax benefits (in shares)		2,200,000
Repurchases of common shares	(1,007.4)		(0.3)	(1,007.1)	0
Repurchases of common shares (in shares)		(32,900,000)
Dividends declared	(16.1)		0	(16.1)	0
Balance at end of period at Sep. 30, 2010	9,996.6		573.5	10,784.7	(1,361.6)
Balance at end of period (in shares) at Sep. 30, 2010		400,100,000
Balance at beginning of period at Dec. 31, 2010	9,890.8		651.5	10,401.9	(1,162.6)
Balance at beginning of period (in shares) at Dec. 31, 2010	384,400,000	384,400,000
Comprehensive income:
Net income	1,613.1		0	1,613.1	0	1,613.1
Other comprehensive income (loss) (Note 8):
Net unrealized gains on securities	138.1		0	0	138.1
Net foreign currency and derivative losses	(5.7)		0	0	(5.7)
Pension and OPEB plans	28.8		0	0	28.8
Other comprehensive (loss) income	161.2		0	0	161.2	161.2
Total comprehensive income						1,774.3
Common shares issued for benefit plans, including tax benefits	258.4		258.4	0	0
Common shares issued for benefit plans, including tax benefits (in shares)		8,600,000
Repurchases of common shares	(1,227.6)		(0.3)	(1,227.3)	0
Repurchases of common shares (in shares)	(30,700,000)	(30,700,000)
Dividends declared	(167.2)		0	(167.2)	0
Balance at end of period at Sep. 30, 2011	$ 10,528.7		$ 909.6	$ 10,620.5	$ (1,001.4)
Balance at end of period (in shares) at Sep. 30, 2011	362,300,000	362,300,000

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Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 2011

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

2. Summary of Significant Accounting Policies

Interim Financial Statements

These interim financial statements necessarily rely on estimates, including assumptions as to annualized tax rates.  In the opinion of management, all adjustments necessary for a fair statement of results for the interim periods have been made.  All such adjustments are of a normal, recurring nature.  The accompanying unaudited consolidated financial statements and related notes should be read in conjunction with the consolidated financial statements and related notes presented in our 2010 Annual Report on Form 10-K (our “2010 Annual Report”).  Certain financial information that is normally included in annual financial statements prepared in accordance with U.S. generally accepted accounting principles (“GAAP”), but that is not required for interim reporting purposes, has been condensed or omitted.  We have omitted certain footnote disclosures that would substantially duplicate the disclosures in our 2010 Annual Report, unless the information contained in those disclosures materially changed or is required by GAAP.  We evaluated subsequent events that occurred after September 30, 2011 through the date the financials were issued and determined there were no other items to disclose.

Principles of Consolidation

These unaudited consolidated financial statements have been prepared in accordance with GAAP and include the accounts of Aetna and the subsidiaries that we control.  All significant intercompany balances have been eliminated in consolidation.

New Accounting Standards

Troubled Debt Restructurings

In April 2011, the Financial Accounting Standards Board (the “FASB”) released new accounting guidance and additional disclosure requirements relating to a creditor’s restructuring of receivables including mortgage loans.  The new guidance became effective beginning July 1, 2011.  Since we have no material problem, restructured or potential problem mortgage loans, the adoption of this accounting guidance did not have a material impact on our financial position or operating results.

Future Application of Accounting Standards

Testing Goodwill for Impairment

In September 2011, the FASB released new accounting guidance amending the current guidance for testing goodwill for impairment. Under the amendments, an entity has the option to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying value. If management determines that a reporting unit's fair value is likely greater than its carrying amount, then no additional analysis is necessary, and the goodwill is not impaired. The new guidance is effective beginning January 1, 2012, and early adoption is permitted. We do not expect the new guidance to have a material impact on our financial position or operating results.

Fees Paid to the Federal Government by Health Insurers

In July 2011, the FASB released new accounting guidance relating to the recognition and income statement reporting of any mandated fees to be paid to the federal government by health insurers which will be effective January 1, 2014. This guidance will apply primarily to new fees enacted in the Patient Protection and Affordable Care Act and the Health Care and Education Reconciliation Act of 2010 (collectively, "Health Care Reform"). We are evaluating the impact this guidance will have on our financial position or operating results.

Presentations of Comprehensive Income

In June 2011, the FASB released new requirements for the presentation of other comprehensive income in financial statements.  The new requirements eliminate the option that previously existed to present changes in other comprehensive income within the statement of shareholders' equity and require its presentation in either a single continuous statement of comprehensive income or in a separate statement immediately following the statement of income.  The new requirements are effective beginning January 1, 2012 and will affect the presentation of our financial statements, but will not have a material impact on our financial position or operating results.

Fair Value Measurements

In May 2011, the FASB released new guidance relating to fair value measurements.  This new guidance amends and clarifies certain existing fair value measurement principles and requires additional disclosures for all Level 3 assets, including a qualitative discussion about the sensitivity of Level 3 fair value measurements.  The new requirements are effective beginning January 1, 2012 and are not expected to have a material impact on our financial position or operating results.

Reconsideration of Effective Control for Repurchase Agreements

In April 2011, the FASB released new accounting guidance relating to repurchase agreements and other agreements that entitle and obligate a transferor to repurchase or redeem financial assets before maturity.  The guidance prescribes when an entity may recognize a sale upon the transfer of financial assets subject to repurchase agreements.  The new guidance is effective beginning January 1, 2012.  Since we treat these transactions as collateralized borrowings rather than sales, we do not expect the adoption of this accounting guidance to have a material impact on our financial position or operating results.

Deferred Acquisition Costs

In October 2010, the FASB released new accounting guidance for costs associated with acquiring or renewing insurance contracts.  This guidance clarifies that such costs qualify for capitalization when affiliated with the successful acquisition of new and renewed insurance contracts.  The new guidance is effective beginning January 1, 2012.  We do not expect the adoption of this accounting guidance to have a material impact on our financial position or operating results.

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Goodwill and Other Acquired Intangible Assets - Goodwill (Details) (USD $) In Millions					9 Months Ended
	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010	Dec. 31, 2009	Sep. 30, 2011 Prodigy Health Group [Member]		Sep. 30, 2010 Prodigy Health Group [Member]		Sep. 30, 2011 Medicity Inc [Member]	Sep. 30, 2010 Medicity Inc [Member]	Sep. 30, 2011 Series of Individually Immaterial Business Acquisitions [Member]		Sep. 30, 2010 Series of Individually Immaterial Business Acquisitions [Member]
Goodwill [Roll Forward]
Balance, beginning of the period	$ 6,010.3	$ 5,146.4	$ 5,145.7	$ 5,146.2
Goodwill, Acquired During Period					445.0	[1]	0	[1]	393.5	0	25.4	[1]	(0.5)
Balance, end of the period	$ 6,010.3	$ 5,146.4	$ 5,145.7	$ 5,146.2

[1] Goodwill related to these acquisitions is considered preliminary, pending the final allocation of the applicable purchase price.

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Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2011

Financial Instruments [Abstract]

Fair Value of Financial Assets

Financial assets and liabilities measured at fair value on a recurring basis in our balance sheets at September 30, 2011 and December 31, 2010 were as follows:

(Millions)	Level 1		Level 2		Level 3		Total
September 30, 2011
Assets:
Debt securities:
U.S. government securities	$	1,277.6	$	251.1	$	—	$	1,528.7
States, municipalities and political subdivisions	—		2,648.5		1.7		2,650.2
U.S. corporate securities	—		6,834.6		61.7		6,896.3
Foreign securities	—		2,825.8		54.8		2,880.6
Residential mortgage-backed securities	—		863.0		—		863.0
Commercial mortgage-backed securities	—		1,306.5		28.7		1,335.2
Other asset-backed securities	—		367.6		47.6		415.2
Redeemable preferred securities	—		138.5		26.8		165.3
Total debt securities	1,277.6		15,235.6		221.3		16,734.5
Equity securities	.8		—		36.4		37.2
Derivatives	—		7.5		—		7.5
Total	$	1,278.4	$	15,243.1	$	257.7	$	16,779.2
Liabilities:
Derivatives	$	—	$	4.2	$	—	$	4.2
December 31, 2010
Assets:
Debt securities:
U.S. government securities	$	1,081.0	$	292.7	$	—	$	1,373.7
States, municipalities and political subdivisions	—		2,292.7		3.6		2,296.3
U.S. corporate securities	—		7,201.9		60.7		7,262.6
Foreign securities	—		2,822.4		54.9		2,877.3
Residential mortgage-backed securities	—		1,140.0		—		1,140.0
Commercial mortgage-backed securities	—		1,275.3		36.9		1,312.2
Other asset-backed securities	—		407.4		56.5		463.9
Redeemable preferred securities	—		178.5		17.8		196.3
Total debt securities	1,081.0		15,610.9		230.4		16,922.3
Equity securities	1.4		—		37.9		39.3
Derivatives	—		2.6		—		2.6
Total	$	1,082.4	$	15,613.5	$	268.3	$	16,964.2
Liabilities:
Derivatives	$	—	$	6.5	$	—	$	6.5

Changes in the Balances of Level 3 Financial Assets

The change in the balance of Level 3 financial assets for the three and nine months ended September 30, 2011 is as follows:

(Millions)	Foreign Securities				Commercial Mortgage-backed Securities			Equity Securities			Other				Total
Three Months Ended September 30, 2011
Beginning balance	$	50.1			$	39.8		$	33.2		$	130.0			$	253.1
Net realized and unrealized capital gains (losses):
Included in earnings	.1				1.1			—			(.6		)		.6
Included in other comprehensive income	(1.5		)		(2.2		)	—			1.0				(2.7		)
Other (1)	(1.1		)		—			(1.8		)	(3.8		)		(6.7		)
Purchases	7.2				—			5.3			12.1				24.6
Sales	—				—			(.3		)	(6.3		)		(6.6		)
Settlements	—				(10.0		)	—			(5.7		)		(15.7		)
Transfers into Level 3	—				—			—			11.1			(2)	11.1
Ending balance	$	54.8			$	28.7		$	36.4		$	137.8			$	257.7
Amount of Level 3 net unrealized losses
included in net income	$	—			$	—		$	—		$	—			$	—
(Millions)	Foreign Securities				Commercial Mortgage-backed Securities			Equity Securities			Other				Total
Nine Months Ended September 30, 2011
Beginning balance	$	54.9			$	36.9		$	37.9		$	138.6			$	268.3
Net realized and unrealized capital gains (losses):
Included in earnings	1.1				2.6			—			(2.2		)		1.5
Included in other comprehensive income	(2.0		)		.8			—			1.2				—
Other (1)	(.4		)		—			(6.7		)	(3.8		)		(10.9		)
Purchases	27.4				—			5.5			22.7				55.6
Sales	(16.4		)		—			(.3		)	(10.0		)		(26.7		)
Settlements	(.8		)		(11.6		)	—			(19.8		)		(32.2		)
Transfers (out of) into Level 3	(9.0		)	(2)	—			—			11.1			(2)	2.1
Ending balance	$	54.8			$	28.7		$	36.4		$	137.8			$	257.7
Amount of Level 3 net unrealized losses
included in net income	$	—			$	—		$	—		$	(.2	)		$	(.2	)

⁽¹⁾  Reflects realized and unrealized capital gains and losses on investments supporting our experience-rated and discontinued products, which do not impact our operating results.

⁽²⁾  Amounts represent gross transfers (out of) into Level 3.

The change in the balance of Level 3 financial assets for the three and nine months ended September 30, 2010 was as follows:

	Three Months Ended													Nine Months Ended
	September 30, 2010													September 30, 2010
(Millions)	U.S.  Corporate  Securities			Foreign  Securities				Other			Total			U.S. Corporate  Securities			Foreign  Securities				Other			Total
Beginning balance	$	85.1			$	50.9		$	169.1		$	305.1		$	75.3			$	199.0		$	209.2		$	483.5
Net realized and unrealized gains (losses):
Included in earnings	(.1		)		1.5			.3			1.7			(.4		)		8.2			4.7			12.5
Included in other comprehensive income	(.9		)		.4			13.8			13.3			(1.7		)		(3.2		)	25.2			20.3
Other (1)	—				.8			1.8			2.6			(.2		)		1.8			(3.7		)	(2.1		)
Purchases, sales and maturities	3.3				(7.0		)	(1.8		)	(5.5		)	(11.3		)		(92.0		)	(56.1		)	(159.4		)
Transfers out of Level 3	(27.1		)		(4.8		)	(12.1		)	(44.0		)	(1.4		)		(72.0		)	(8.2		)	(81.6		)
Ending balance	$	60.3			$	41.8		$	171.1		$	273.2		$	60.3			$	41.8		$	171.1		$	273.2
Amount of Level 3 net unrealized losses included in net income	$	—			$	—		$	(.4	)	$	(.4	)	$	—			$	—		$	(.4	)	$	(.4	)

⁽¹⁾  Reflects realized and unrealized capital gains and losses on investments supporting our experience-rated and discontinued products, which do not impact our operating results.

Carrying Value and Estimated Fair Value of Certain Financial Instruments

The carrying value and estimated fair value of certain of our financial instruments at September 30, 2011 and December 31, 2010 were as follows:

	September 30, 2011				December 31, 2010
(Millions)	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Assets:
Mortgage loans	$	1,605.8	$	1,650.5	$	1,509.8	$	1,526.1
Liabilities:
Investment contract liabilities:
With a fixed maturity	37.4		37.7		41.7		42.7
Without a fixed maturity	533.6		553.9		511.5		510.9
Long-term debt	3,977.1		4,683.5		4,382.5		4,728.9

Separate Account Financial Assets

Separate Accounts financial assets at September 30, 2011 and December 31, 2010 were as follows:

	September 30, 2011										December 31, 2010
(Millions)	Level 1		Level 2			Level 3		Total			Level 1		Level 2		Level 3		Total
Debt securities	$	1,264.2	$	2,627.3		$	.1	$	3,891.6		$	1,059.7	$	2,524.9	$	56.0	$	3,640.6
Equity securities	839.3		—			—		839.3			1,231.9		—		—		1,231.9
Derivatives	—		(4.7		)	—		(4.7		)	—		.2		—		.2
Total (1)	$	2,103.5	$	2,622.6		$	.1	$	4,726.2		$	2,291.6	$	2,525.1	$	56.0	$	4,872.7

⁽¹⁾  Excludes $432.9 million and $422.6 million of cash and cash equivalents and other receivables at September 30, 2011 and December 31, 2010, respectively

Changes in Balances of Level 3 Separate Account

The change in the balance of Level 3 Separate Accounts financial assets for the three and nine months ended September 30, 2011 and 2010 was as follows:

	Three Months Ended			Nine Months Ended
	September 30, 2011			September 30, 2011
(Millions)	Debt Securities			Debt Securities
Beginning balance	$	39.0		$	56.0
Total losses accrued to contract holders	—			(15.6		)
Purchases, sales and settlements	(38.2		)	(39.1		)
Transfers out of Level 3	(.7		)	(1.2		)
Ending balance	$	.1		$	.1

	Three Months Ended			Nine Months Ended
	September 30, 2010			September 30, 2010
(Millions)	Debt Securities			Debt Securities			Real Estate			Total
Beginning balance	$	87.7		$	97.3		$	71.4		$	168.7
Total (losses) gains accrued to contract holders	(13.2		)	(43.8		)	5.2			(38.6		)
Purchases, sales and maturities	3.1			21.1			.2			21.3
Transfers out of Level 3  (1)	(3.7		)	(.7		)	(76.8		)	(77.5		)
Ending balance	$	73.9		$	73.9		$	—		$	73.9

⁽¹⁾  The transfers out of Level 3 for 2010 primarily represent real estate Separate Account assets that were transitioned out of our business in the second quarter of 2010.

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Pension and Other Postretirement Plans (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended				9 Months Ended
	Aug. 31, 2010 years percent	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010		Aug. 30, 2010 years
Pension Plans [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost		$ 0		$ 16.4		$ 0		$ 47.1
Amortization of prior service cost		(0.1)		(0.4)		(0.3)		(1.5)
Curtailment gain		0		11.9		0		11.9
Total operating component		(0.1)	[1]	4.1	[1]	(0.3)	[1]	33.7	[1]
Interest cost		78.0		74.9		234.2		228.2
Defined Benefit Plan, Expected Return on Plan Assets		95.9		87.8		287.8		264.3
Recognized net actuarial losses		14.6		40.9		43.8		141.4
Total financing component		(3.3)	[1]	28.0	[1]	(9.8)	[1]	105.3	[1]
Net periodic benefit (income) cost		(3.4)		32.1		(10.1)		139.0
Defined Benefit Plan, Plan Amendment [Abstract]
Effect of Plan Amendment on Accumulated Benefit Obligation	743
Effect of Plan Amendment on Accumulated Other Comprehensive Income, Before Tax	836
Effect of Plan Amendment on Accumulated Other Comprehensive Income, After Tax	543
Effect of Plan Amendment on Plan Assets	156
Assumptions Used Calculating Plan Remeasurement, Discount Rate	4.77%
Assumptions Used Calculating Plan Remeasurement, Expected Long-Term Return on Assets	7.50%
Amortization Period For Calculating Actuarial Gains and Losses	31									9
Voluntary cash contributions to the plan		60		505
OPEB Plans [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost		0		0.1		0.1		0.2
Amortization of prior service cost		(1.0)		(1.0)		(2.8)		(2.8)
Curtailment gain		0		0		0		0
Total operating component		(1.0)	[1]	(0.9)	[1]	(2.7)	[1]	(2.6)	[1]
Interest cost		4.2		4.5		12.5		13.4
Defined Benefit Plan, Expected Return on Plan Assets		0.9		0.9		2.7		2.7
Recognized net actuarial losses		1.3		1.1		3.7		3.4
Total financing component		4.6	[1]	4.7	[1]	13.5	[1]	14.1	[1]
Net periodic benefit (income) cost		$ 3.6		$ 3.8		$ 10.8		$ 11.5

[1] The operating component of this expense is allocated to our business segments and the financing component is allocated to our Corporate Financing segment. Our Corporate Financing segment is not a business segment but is added to our business segments to reconcile to our consolidated results. Refer to Note 15 beginning on page 29 for additional information on our business segments.

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Debt - Short-term Debt (Details) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Short-term Debt [Line Items]
Short-term debt	$ 449,900,000	$ 0
Commercial Paper [Member]
Short-term Debt [Line Items]
Short-term debt	$ 449,900,000	$ 0.000
Short-term Debt, Weighted Average Interest Rate	0.38%

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Investments - Investment Income (Details) (USD $) In Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 241.1		$ 255.6		$ 749.7		$ 798.2
Less: investment expenses	(7.5)		(7.4)		(22.2)		(21.1)
Net Investment Income	233.6	[1]	248.2	[1]	727.5	[1]	777.1	[1]
Supporting Discontinued And Experience Rated Products [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Net Investment Income	85.8		78.3		252.8		246.7
Debt Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	205.1		225.8		628.5		694.3
Mortgage Loans [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	26.5		25.4		75.8		78.4
Other Investments [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 9.5		$ 4.4		$ 45.4		$ 25.5

[1] Investment risks associated with our experience-rated and discontinued products generally do not impact our operating results (refer to Note 17 beginning on page 30 for additional information on our accounting for discontinued products). Net investment income includes $85.8 million and $252.8 million for the three and nine months ended September 30, 2011, respectively, and $78.3 million and $246.7 million for the three and nine months ended September 30, 2010, respectively, related to investments supporting our experience-rated and discontinued products

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Capital Stock - Stock Units (Details) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum Vesting Percentage During Performance Period For Performance Stock Units	0.00%
Vesting Percentage For Market Stock Units Range Maximum	150.00%
Maximum Vesting Percentage During Performance Period For Performance Stock Units	200.00%
Vesting Percentage For Market Stock Units Range Minimum	0.00%
Percentage Restricted Stock Units Vested In Three Years	100.00%
Performance Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	0.6
Market Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	1.2
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	1.0

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Acquisitions

9 Months Ended

Sep. 30, 2011

Business Combinations [Abstract]

Acquisition

3. Acquisitions

During the nine months ended September 30, 2011, we completed the acquisitions of Medicity Inc. ("Medicity") and Prodigy Health Group ("Prodigy"). In October 2011, we completed the acquisitions of Genworth Financial, Inc.'s ("Genworth's") Medicare Supplement business and related blocks of in-force business and PayFlex Holdings, Inc. ("PayFlex"). Each of these acquisitions was funded using available resources. Refer to Note 6 on page 9 for additional information.

• Medicity Inc.

In January 2011, we acquired Medicity, a health information exchange company, for approximately $490 million.  We recorded goodwill related to this transaction of approximately $394 million, a majority of which will not be tax deductible.  All of the goodwill related to this acquisition was assigned to our Health Care segment.

• Prodigy Health Group

In June 2011, we acquired Prodigy, a third party administrator of self-funded health care plans, for approximately $600 million.  We preliminarily recorded goodwill related to this transaction of approximately $445 million, of which approximately $52 million will be tax deductible.  All of the goodwill related to this acquisition was assigned to our Health Care segment.

• Genworth Financial, Inc.'s Medicare Supplement Business and Related Blocks of In-Force Business

In October 2011, we acquired Genworth's Medicare Supplement business and related blocks of in-force business for approximately $260 million.  The majority of the goodwill related to this acquisition will be assigned to our Health Care segment. The transaction closed after September 30, 2011, and therefore has not been reflected in these financial statements.

• PayFlex Holdings, Inc.

In October 2011, we acquired PayFlex, one of the nation’s largest independent account-based health plan administrators, for approximately $190 million.  All of the goodwill related to this acquisition will be assigned to our Health Care segment. The transaction closed after September 30, 2011, and therefore has not been reflected in these financial statements.

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Goodwill and Other Acquired Intangible Assets - Future Amortization Expense (Details) (USD $) In Millions	9 Months Ended
	Sep. 30, 2011
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2011	$ 114.5
2012	115.7
2013	106.5
2014	87.4
2015	72.1
2016	$ 68.2

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Goodwill and Other Acquired Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2011

Goodwill and Intangible Assets Disclosure [Abstract]

Change in Goodwill

The increase in goodwill for the nine months ended September 30, 2011 and 2010 is as follows:

(Millions)	2011		2010
Balance, beginning of the period	$	5,146.4	$	5,146.2
Goodwill acquired:
Prodigy (1)	445.0		—
Medicity	393.5		—
Other (1)	25.4		(.5		)
Balance, end of the period	$	6,010.3	$	5,145.7

⁽¹⁾  Goodwill related to these acquisitions is considered preliminary, pending the final allocation of the applicable purchase price.

Other acquired intangible assets

Other acquired intangible assets at September 30, 2011 and December 31, 2010 were comprised of the following:

(Millions)	Cost		Accumulated Amortization			Net Balance		Amortization Period (Years)
September 30, 2011
Provider networks	$	703.2		$	421.3	$	281.9		12-25	(1)
Customer lists	661.4			313.9		347.5			4-10	(1)
Technology	120.9			32.6		88.3			3-10
Other	21.8			16.9		4.9			2-15
Definite-lived trademarks	47.6			12.7		34.9			2-15
Indefinite-lived trademarks	22.3			—		22.3
Total other acquired intangible assets	$	1,577.2		$	797.4	$	779.8
December 31, 2010
Provider networks	$	703.2		$	398.9	$	304.3		12-25	(1)
Customer lists	420.4			262.6		157.8			4-10	(1)
Technology	25.3			25.0		.3			3-5
Other	17.1			16.8		.3			2-15
Definite-lived trademarks	21.0			10.5		10.5			2-15
Indefinite-lived trademarks	22.3			—		22.3
Total other acquired intangible assets	$	1,209.3		$	713.8	$	495.5

⁽¹⁾  The amortization period for our provider networks and customer lists includes an assumption of renewal or extension of these arrangements.  At September 30, 2011 and December 31, 2010, the periods prior to next renewal or extension for our provider networks primarily ranged from 1 to 3 years. At September 30, 2011 and December 31, 2010, the period prior to the next renewal or extension for our customer lists was approximately one year. Any costs related to the renewal or extension of these contracts is expensed as incurred.

Estimated annual pretax amortization for other acquired intangible assets over the next five years

We estimate annual pretax amortization for other acquired intangible assets for 2011 and over the next five years to be as follows:

(Millions)
2011	$	114.5
2012	115.7
2013	106.5
2014	87.4
2015	72.1
2016	68.2

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Segment Information (Details) (USD $) In Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Segment Reporting Information, Profit (Loss) [Abstract]
Revenue from external customers	$ 8,163.1		$ 8,211.0		$ 24,340.3		$ 24,729.3
Operating earnings	528.4	[1]	419.6	[1]	1,611.4	[1]	1,300.4	[1]
Health Care [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Revenue from external customers	7,695.9		7,733.3		22,919.1		23,258.1
Operating earnings	525.7	[1]	442.2	[1]	1,593.9	[1]	1,369.7	[1]
Group Insurance [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Revenue from external customers	426.6		436.2		1,288.1		1,345.5
Operating earnings	37.9	[1]	34.6	[1]	125.2	[1]	107.5	[1]
Large Case Pension [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Revenue from external customers	40.6		41.5		133.1		125.7
Operating earnings	4.4	[1]	5.6	[1]	16.4	[1]	21.4	[1]
Corporate Financing [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Revenue from external customers	0		0		0		0
Operating earnings	$ (39.6)	[1]	$ (62.8)	[1]	$ (124.1)	[1]	$ (198.2)	[1]

[1] Operating earnings (loss) excludes net realized capital gains or losses and the other items described in the reconciliation on page 30.

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Capital Stock - Repurchases (Details) (USD $) Share data in Millions	0 Months Ended			9 Months Ended
	Dec. 03, 2010	Sep. 23, 2011	May 20, 2011	Sep. 30, 2011	Sep. 30, 2010
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Authorized Amount	$ 750,000,000	$ 750,000,000	$ 750,000,000
Stock Repurchased During Period, Shares				30.7
Stock Repurchased During Period, Value				1,227,600,000	1,007,400,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount				$ 1,000,000,000

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Debt (Tables)

9 Months Ended

Sep. 30, 2011

Debt Disclosure [Abstract]

Carrying Value of Long-Term Debt

The carrying value of our long-term debt at September 30, 2011 and December 31, 2010 was as follows:

(Millions)	September 30, 2011		December 31, 2010
Senior notes, 5.75%, due 2011 (1)	$	—	$	450.0
Senior notes, 7.875%, due 2011 (1)	—		449.9
Senior notes, 6.0%, due 2016	747.9		747.6
Senior notes, 6.5%, due 2018	499.0		498.9
Senior notes, 3.95%, due 2020	742.4		741.7
Senior notes, 4.125%, due 2021	493.3		—
Senior notes, 6.625%, due 2036	798.7		798.7
Senior notes, 6.75%, due 2037	695.8		695.7
Total long-term debt	3,977.1		4,382.5

⁽¹⁾  The 5.75% senior notes and the 7.875% senior notes were repaid in June 2011 and March 2011, respectively. These were classified as current in the consolidated balance sheet as of December 31, 2010.

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Goodwill and Other Acquired Intangible Assets (Details) - Intangible Assets (USD $) In Millions, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2011		Dec. 31, 2010
Finite-Lived Intangible Assets [Abstract]
Finite-Lived Intangible Assets, Accumulated Amortization	$ 797.4		$ 713.8
Total other acquired intangible assets, gross	1,577.2		1,209.3
Other acquired intangible assets, net	779.8		495.5
Provider networks [Member]
Finite-Lived Intangible Assets [Abstract]
Finite-Lived Intangible Assets, Gross	703.2		703.2
Finite-Lived Intangible Assets, Accumulated Amortization	421.3		398.9
Finite-Lived Intangible Assets, Net	281.9		304.3
Amortization period, minimum (in years)	12	[1]	12	[1]
Amortization period, maximum (in years)	25	[1]	25	[1]
The minimum number of years in the period prior to the next renewal or extension for provider networks (in years)	1
The maximum number of years in the period prior to the next renewal or extension for provider networks (in years)	3
Customer Lists [Member]
Finite-Lived Intangible Assets [Abstract]
Finite-Lived Intangible Assets, Gross	661.4		420.4
Finite-Lived Intangible Assets, Accumulated Amortization	313.9		262.6
Finite-Lived Intangible Assets, Net	347.5		157.8
Amortization period, minimum (in years)	4	[1]	4	[1]
Amortization period, maximum (in years)	10	[1]	10	[1]
The number of years in the period prior to the next renewal or extension for customer lists (in years)	1
Unpatented Technology [Member]
Finite-Lived Intangible Assets [Abstract]
Finite-Lived Intangible Assets, Gross	120.9		25.3
Finite-Lived Intangible Assets, Accumulated Amortization	32.6		25.0
Finite-Lived Intangible Assets, Net	88.3		0.3
Amortization period, minimum (in years)	3		3
Amortization period, maximum (in years)	10		5
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Abstract]
Finite-Lived Intangible Assets, Gross	21.8		17.1
Finite-Lived Intangible Assets, Accumulated Amortization	16.9		16.8
Finite-Lived Intangible Assets, Net	4.9		0.3
Amortization period, minimum (in years)	2		2
Amortization period, maximum (in years)	15		15
Trademarks Definite Lived [Member]
Finite-Lived Intangible Assets [Abstract]
Finite-Lived Intangible Assets, Gross	47.6		21.0
Finite-Lived Intangible Assets, Accumulated Amortization	12.7		10.5
Finite-Lived Intangible Assets, Net	34.9		10.5
Amortization period, minimum (in years)	2		2
Amortization period, maximum (in years)	15		15
Trademarks Indefinite Lived [Member]
Finite-Lived Intangible Assets [Abstract]
Acquired Indefinite-lived Intangible Asset, Amount	22.3		22.3
Fiscal 2011 Acquisitions [Member]
Finite-Lived Intangible Assets [Abstract]
Amount of assigned intangible assets	367.9
Preliminary amount of assigned intangible assets	$ 227.0

[1] The amortization period for our provider networks and customer lists includes an assumption of renewal or extension of these arrangements. At September 30, 2011 and December 31, 2010, the periods prior to next renewal or extension for our provider networks primarily ranged from 1 to 3 years. At September 30, 2011 and December 31, 2010, the period prior to the next renewal or extension for our customer lists was approximately one year. Any costs related to the renewal or extension of these contracts is expensed as incurred.

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Other Comprehensive (Loss) Income (Tables)

9 Months Ended

Sep. 30, 2011

Other Comprehensive Income (Loss), Net of Tax [Abstract]

Other Comprehensive (Loss) Income

Shareholders’ equity included the following activity in accumulated other comprehensive loss (excluding amounts related to experience-rated contract holders and discontinued products) for the nine months ended September 30, 2011 and 2010:

	Net Unrealized Gains (Losses)											Pension and OPEB Plans							Total Accumulated Other Comprehensive (Loss) Income
	Securities						Foreign Currency and Derivatives
(Millions)	Previously Impaired (1)			All Other							Unrecognized Net Actuarial Losses				Unrecognized Prior Service Cost
Nine months ended September 30, 2011
Balance at December 31, 2010	$	75.1		$	375.2			$	(27.3	)		$	(1,614.0	)		$	28.4			$	(1,162.6	)
Net unrealized gains (losses) ($376.6 pretax)	.7			251.9				(7.8		)		—				—				244.8
Reclassification to earnings ($128.6 pretax)	(16.8		)	(97.7		)		2.1				30.8				(2.0		)		(83.6		)
Other comprehensive (loss) income	(16.1		)	154.2				(5.7		)		30.8				(2.0		)		161.2
Balance at September 30, 2011	$	59.0		$	529.4			$	(33.0	)		$	(1,583.2	)		$	26.4			$	(1,001.4	)
Nine months ended September 30, 2010
Balance at December 31, 2009	$	100.3		$	235.7			$	25.3			$	(1,623.8	)		$	39.5			$	(1,223.0	)
Net unrealized gains (losses) ($5.7 pretax)	51.2			549.9				(53.8		)		(543.6		)		—				3.7
Reclassification to earnings ($149.1 pretax)	(67.5		)	(159.1		)		.5				94.3				(10.5		)		(142.3		)
Other comprehensive (loss) income	(16.3		)	390.8				(53.3		)		(449.3		)		(10.5		)		(138.6		)
Balance at September 30, 2010	$	84.0		$	626.5			$	(28.0	)		$	(2,073.1	)		$	29.0			$	(1,361.6	)

⁽¹⁾  Represents unrealized losses on the non-credit-related component of impaired debt securities that we do not intend to sell and subsequent appreciation in the fair value of those securities as well as those that we intend to sell.

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Debt

9 Months Ended

Sep. 30, 2011

Debt Disclosure [Abstract]

Debt

11. Debt

The carrying value of our long-term debt at September 30, 2011 and December 31, 2010 was as follows:

(Millions)	September 30, 2011		December 31, 2010
Senior notes, 5.75%, due 2011 (1)	$	—	$	450.0
Senior notes, 7.875%, due 2011 (1)	—		449.9
Senior notes, 6.0%, due 2016	747.9		747.6
Senior notes, 6.5%, due 2018	499.0		498.9
Senior notes, 3.95%, due 2020	742.4		741.7
Senior notes, 4.125%, due 2021	493.3		—
Senior notes, 6.625%, due 2036	798.7		798.7
Senior notes, 6.75%, due 2037	695.8		695.7
Total long-term debt	3,977.1		4,382.5

⁽¹⁾  The 5.75% senior notes and the 7.875% senior notes were repaid in June 2011 and March 2011, respectively. These were classified as current in the consolidated balance sheet as of December 31, 2010.

In the three and nine months ended September 30, 2011, we entered into two interest rate swaps with an aggregate notional value of $250 million. We designated these swaps as cash flow hedges against interest rate exposure related to the forecasted future issuance of fixed-rate debt. At September 30, 2011, these interest rate swaps had an aggregate fair market value loss of $3 million, which was reflected in accumulated other comprehensive income.

In May 2011, we issued $500 million of 4.125% senior notes due 2021 (the “2011 senior notes”) in anticipation of the scheduled maturity of our 5.75% senior notes due June 2011.  In the first half of 2011, prior to issuing the 2011 senior notes, we entered into two interest rate swaps with an aggregate notional value of $250 million and designated those interest rate swaps as a hedge against interest rate exposure related to the forecast issuance of that fixed-rate debt.  We terminated the swaps concurrently with issuing the 2011 senior notes and upon termination of the swaps, paid $9 million to the swap counterparty.  The related $9 million loss is recorded in accumulated other comprehensive income and is being amortized as interest expense over the ten-year life of the 2011 senior notes.

At September 30, 2011, we had approximately $450 million of commercial paper outstanding with a weighted average interest rate of .38%.  At December 31, 2010, we did not have any commercial paper outstanding.

At September 30, 2011, we had an unsecured $1.5 billion revolving credit agreement (the “Facility”) with several financial institutions which terminates in March 2013.  The Facility provides for the issuance of up to $200 million of letters of credit at our request, which count as usage of the available commitments under the Facility.  Upon our agreement with one or more financial institutions, we may expand the aggregate commitments under the Facility to a maximum of $2.0 billion. Various interest rate options are available under the Facility.  Any revolving borrowings mature on the termination date of the Facility.  We pay facility fees on the Facility ranging from .045% to .175% per annum, depending upon our long-term senior unsecured debt rating.  The facility fee was .06% at September 30, 2011.  The Facility contains a financial covenant that requires us to maintain a ratio of total debt to consolidated capitalization as of the end of each fiscal quarter at or below .5 to 1.0.  For this purpose, consolidated capitalization equals the sum of total shareholders’ equity, excluding any overfunded or underfunded status of our pension and OPEB plans and any net unrealized capital gains and losses, and total debt (as defined in the Facility).  We met this requirement at September 30, 2011.  There were no amounts outstanding under the Facility at any time during the three or nine months ended September 30, 2011.

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Financial Instruments - Separate Accounts Fair Value (Details) (USD $) In Millions	Sep. 30, 2011		Dec. 31, 2010
Cash and Cash Equivalents [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Separate Accounts, Asset	$ 432.9		$ 422.6
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Separate Accounts, Asset	1,264.2		1,059.7
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Separate Accounts, Asset	2,627.3		2,524.9
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Separate Accounts, Asset	0.1		56.0
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Debt Securities [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Separate Accounts, Asset	3,891.6		3,640.6
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Separate Accounts, Asset	839.3		1,231.9
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Separate Accounts, Asset	0		0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Separate Accounts, Asset	0		0
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Equity Securities [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Separate Accounts, Asset	839.3		1,231.9
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Derivatives [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Separate Accounts, Asset	0		0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Derivatives [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Separate Accounts, Asset	(4.7)		0.2
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Derivatives [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Separate Accounts, Asset	0		0
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Derivatives [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Separate Accounts, Asset	(4.7)		0.2
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Separate Accounts, Asset	2,103.5	[1]	2,291.6	[1]
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Separate Accounts, Asset	2,622.6	[1]	2,525.1	[1]
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Separate Accounts, Asset	0.1	[1]	56.0	[1]
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Separate Accounts, Asset	$ 4,726.2	[1]	$ 4,872.7	[1]

[1] Excludes $432.9 million and $422.6 million of cash and cash equivalents and other receivables at September 30, 2011 and December 31, 2010, respectively.

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Debt - Line of Credit (Details) (USD $)	9 Months Ended
	Sep. 30, 2011
Line of Credit Facility [Line Items]
Unsecured revolving credit agreement	$ 1,500,000,000
Maximum Amount Of Letters Of Credit Issuable	200,000,000
Line Of Credit Facility Maximum Expandable Borrowing Capacity	2,000,000,000
Range of facility fees under revolving credit agreement, minimum (in hundredths)	.045% to .175%
Facility fee (in hundredths)	0.06%
Ratio of total debt to consolidated capitalization	0.5 to 1.0
Line of Credit Facility, Maximum Amount Outstanding During Period	$ 0

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Earnings Per Common Share

9 Months Ended

Sep. 30, 2011

Earnings Per Share [Abstract]

Earnings Per Common Share

4. Earnings Per Common Share

Basic earnings per share (“EPS”) is computed by dividing net income by the weighted average number of common shares outstanding during the reporting period.  Diluted EPS is computed in a similar manner, except that the weighted average number of common shares outstanding is adjusted for the dilutive effects of our outstanding stock awards.

The computations of basic and diluted EPS for the three and nine months ended September 30, 2011 and 2010 are as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(Millions, except per common share data)	2011		2010		2011		2010
Net income	$	490.4	$	497.6	$	1,613.1	$	1,551.2
Weighted average shares used to compute basic EPS	369.2		412.7		377.2		422.3
Dilutive effect of outstanding stock-based compensation awards (1)	7.6		6.1		7.8		7.2
Weighted average shares used to compute diluted EPS	376.8		418.8		385.0		429.5
Basic EPS	$	1.33	$	1.21	$	4.28	$	3.67
Diluted EPS	$	1.30	$	1.19	$	4.19	$	3.61

⁽¹⁾  Stock based compensation awards are not included in the calculation of diluted EPS if the exercise price is greater than the average market price of Aetna common shares during the period (i.e., the awards are anti-dilutive).  Approximately 12.6 million and 12.7 million stock appreciation rights were not included in the calculation of diluted EPS for the three and nine months ended September 30, 2011, respectively.  Approximately 18.6 million and 18.7 million stock appreciation rights and 5.7 million and 5.8 million stock options were not included in the calculation of diluted EPS for the three and nine months ended September 30, 2010, respectively. These stock based compensation awards were excluded from the calculation of diluted EPS because their effect was anti-dilutive.

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2011

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

14. Commitments and Contingencies

Guaranty Fund Assessments

Under guaranty fund laws existing in all states, insurers doing business in those states can be assessed (up to prescribed limits) for certain obligations of insolvent insurance companies to policyholders and claimants. The health insurance guaranty associations in which we participate that operate under these laws respond to insolvencies of long-term care insurers as well as health insurers.  Our assessments generally are based on a formula relating to our premiums in the state compared to the premiums of other insurers. Certain states allow assessments to be recovered as offsets to premium taxes.  Some states have similar laws relating to HMOs.  The Pennsylvania Insurance Commissioner has placed long-term care insurer Penn Treaty Network America Insurance Company and one of its subsidiaries (collectively, “Penn Treaty”) in rehabilitation, an intermediate action before insolvency, and has petitioned a state court for liquidation.  We cannot predict when a decision will be made, although we believe it is likely that the state court will rule within the next twelve months.  If Penn Treaty is declared insolvent and placed in liquidation, we and other insurers likely would be assessed over a period of years by guaranty associations for the payments the guaranty associations are required to make to Penn Treaty policyholders.  We are currently unable to predict the ultimate outcome of, or reasonably estimate the loss or range of losses resulting from, this potential insolvency because we cannot predict when the state court will render a decision, the amount of the insolvency, if any, the amount and timing of associated guaranty association assessments or the amount or availability of potential

offsets, such as premium tax offsets.  It is reasonably possible that in future reporting periods we may record a liability and expense relating to Penn Treaty or other insolvencies which could have a material adverse effect on our operating results, financial position and cash flows.  While we have historically recovered more than half of guaranty fund assessments through statutorily permitted premium tax offsets, significant increases in assessments could jeopardize future recovery of these assessments as regulatory actions may limit future offsets.

Litigation and Regulatory Proceedings

Out-of-Network Benefit Proceedings

We are named as a defendant in several purported class actions and individual lawsuits arising out of our practices related to the payment of claims for services rendered to our members by health care providers with whom we do not have a contract (“out-of-network providers”).   Among other things, these lawsuits allege that we paid too little to our health plan members and/or providers for these services, among other reasons, because of our use of data provided by Ingenix, Inc., a subsidiary of one of our competitors (“Ingenix”). Other major health insurers are the subject of similar litigation or have settled similar litigation.  

Various plaintiffs who are health care providers or medical associations seek to represent nationwide classes of out-of-network providers who provided services to our members during the period from 2001 to the present.  Various plaintiffs who are members in our health plans seek to represent nationwide classes of our members who received services from out-of-network providers during the period from 2001 to the present.  Taken together, these lawsuits allege that we violated state law, the Employee Retirement Income Security Act of 1974, as amended (“ERISA”), the Racketeer Influenced and Corrupt Organizations Act and federal antitrust laws, either acting alone or in concert with our competitors.  The purported classes seek reimbursement of all unpaid benefits, recalculation and repayment of deductible and coinsurance amounts, unspecified damages and treble damages, statutory penalties, injunctive and declaratory relief, plus interest, costs and attorneys’ fees, and seek to disqualify us from acting as a fiduciary of any benefit plan that is subject to ERISA.  Individual lawsuits that generally contain similar allegations and seek similar relief have been brought by health plan members and out-of-network providers.

The first class action case was commenced on July 30, 2007.  The federal Judicial Panel on Multi-District Litigation (the “MDL Panel”) has consolidated these class action cases in the U.S. District Court for the District of New Jersey (the “New Jersey District Court”) under the caption In re: Aetna UCR Litigation, MDL No. 2020 (“MDL 2020”).   In addition, the MDL Panel has transferred the individual lawsuits to MDL 2020.  On May 9, 2011, the New Jersey District Court dismissed the physician plaintiffs from MDL 2020 without prejudice.  The New Jersey District Court’s action followed a ruling by the United States District Court for the Southern District of Florida (the “Florida District Court”) that the physician plaintiffs were enjoined from participating in MDL 2020 due to a prior settlement and release.  The physician plaintiffs have attempted to appeal the Florida District Court’s ruling to the United States Court of Appeals for the Eleventh Circuit.

Discovery is substantially complete in MDL 2020, several motions are pending, and briefing on class certification has been completed.  The court has not set a trial date or a timetable for deciding class certification.  We intend to vigorously defend ourselves against the claims brought in these cases.

We also have received subpoenas and/or requests for documents and other information from, and been investigated by, attorneys general and other state and/or federal regulators, legislators and agencies relating to our out-of-network benefit payment practices.  It is reasonably possible that others could initiate additional litigation or additional regulatory action against us with respect to our out-of-network benefit payment practices.

CMS Actions

On June 13, 2011, the Centers for Medicare & Medicaid Services (“CMS”) lifted the intermediate sanctions it had previously imposed on us that required us to suspend the enrollment of and marketing to new members of all Aetna Medicare Advantage and Standalone Prescription Drug Plan (“PDP”) contracts.  The sanctions related to our compliance with certain Medicare Part D requirements.  We have resumed marketing our Medicare Advantage and PDP products and are enrolling beneficiaries with effective dates on and after July 1, 2011.  CMS still is not assigning any new low income subsidy members to our PDPs at this time.  However, low income subsidy members can make their own choice to enroll in Aetna products during the upcoming annual enrollment period.  As a result of these sanctions, our 2011 Medicare membership and operating results have been adversely affected because we did not participate in the 2010 open enrollment for individual 2011 Medicare plans, which occurred between November 15, 2010 and December 31, 2010.  We continue to cooperate fully with CMS to address residual matters identified in connection with the sanction review.

CMS regularly audits our performance to determine our compliance with CMS’s regulations, our contracts with CMS and the quality of services we provide to our Medicare members.  CMS uses various payment mechanisms to allocate and adjust premium payments to our and other companies’ Medicare plans by considering the applicable health status of Medicare members as supported by information maintained and provided by health care providers.  We collect claim and encounter data from providers and generally rely on providers to appropriately code their submissions and document their medical records.  Medicare Advantage plans and PDPs receive increased premiums for members who have certain medical conditions identified with specific health condition codes.  Federal regulators review and audit the providers’ medical records and related health condition codes that determine the members’ health status and the resulting premium payments to us.  CMS has instituted risk adjustment data validation (“RADV”) audits of various Medicare Advantage plans, including two of Aetna’s contracts for the 2007 contract year.  Although these two audits are ongoing, we do not believe that they will have a material impact on our operating results, financial position or cash flows.

We believe that the Office of the Inspector General (the “OIG”) also is auditing risk adjustment data, and we expect CMS and the OIG to continue auditing risk adjustment data for the 2007 contract year and beyond.  Aetna and other Medicare Advantage organizations have provided comments to CMS in response to CMS’s December 2010 proposed RADV sampling and payment error calculation methodology by which CMS proposes to calculate and extrapolate RADV audit payment error rates for, and determine premium refunds payable by, Medicare Advantage plans.  Our concerns with CMS’s proposed methodology include the fact that the proposed methodology does not take into account the “error rate” in the original Medicare fee-for-service data that was used to develop the risk adjustment system and that retroactive audit and payment adjustments undermine the actuarial soundness of Medicare Advantage bids.  CMS has indicated that it may make retroactive contract-level premium payment adjustments based on the results of these RADV audits, which could occur as early as the fourth quarter of 2011.  CMS’s premium adjustments could be implemented prior to our, or other Medicare Advantage plans, having an opportunity to appeal the audit or payment error calculation results or methodology.  We are unable to predict the ultimate outcome of CMS’s final RADV audit methodology, other audits for the 2007 contract year or subsequent contract years, the amounts of any retroactive refunds of, or prospective adjustments to, premium payments made to us, or whether any audit findings would cause a change to our method of estimating future premium revenue in bid submissions to CMS for the current or future contract years or compromise premium assumptions made in our bids for prior contract years.  Any premium refunds or adjustments resulting from regulatory audits, including those resulting from CMS’s selection of its final RADV audit methodology, whether as a result of RADV or other audits by CMS or OIG or otherwise, could be material and could adversely affect our operating results, financial position and cash flows.

Other Litigation and Regulatory Proceedings

We are involved in numerous other lawsuits arising, for the most part, in the ordinary course of our business operations, including employment litigation and claims of bad faith, medical malpractice, non-compliance with state and federal regulatory regimes, marketing misconduct, failure to timely or appropriately pay medical and/or group insurance claims (including post-payment audit and collection practices), rescission of insurance coverage, improper disclosure of personal information, patent infringement and other intellectual property litigation and other litigation in our Health Care and Group Insurance businesses.  Some of these other lawsuits are or are purported to be class actions.  We intend to vigorously defend ourselves against the claims brought in these matters.

In addition, our operations, current and past business practices, current and past contracts, and accounts and other books and records are subject to routine, regular and special investigations, audits, examinations and reviews by, and from time to time we receive subpoenas and other requests for information from, CMS, various state insurance and health care regulatory authorities, state attorneys general, the Center for Consumer Information and Insurance Oversight, the Office of the Inspector General, the Office of Personnel Management, committees, subcommittees and members of the U.S. Congress, the U.S. Department of Justice, U.S. attorneys and other state and federal governmental authorities.  These government actions include inquiries by, and testimony before, certain members, committees and subcommittees of the U.S. Congress regarding certain of our current and past business practices, including our overall claims processing and payment practices, our business practices with respect to our small group products, student health products or individual customers (such as market withdrawals, rating information, premium increases and medical benefit ratios), executive compensation matters and travel and entertainment expenses, as well as the investigations by, and subpoenas and requests from, attorneys general and others described above under “Out-of-Network Benefit Proceedings.”  There also continues to be heightened review by regulatory authorities of and increased litigation regarding the health and related benefits industry’s business and reporting practices, including premium rate increases, utilization management, complaint and grievance processing, information privacy, provider network structure (including the use of performance-based networks), delegated arrangements, rescission of insurance coverage, limited benefit health products, student health products, pharmacy benefit management practices and claim payment practices (including payments to out-of-network providers and payments on life insurance policies).  As a leading national health and related benefits company, we regularly are the subject of such government actions.  These government actions may prevent or delay us from implementing planned premium rate increases and may result, and have resulted, in restrictions on our business, changes to or clarifications of our business practices, retroactive adjustments to premiums, refunds or other payments to members, beneficiaries or states, assessments of damages, civil or criminal fines or penalties, or other sanctions, including the possible loss of licensure or suspension or exclusion from participation in government programs, such as the intermediate sanctions previously imposed on us by CMS that are described above under “CMS Actions.”

Estimating the probable losses or a range of probable losses resulting from litigation, government actions and other legal proceedings is inherently difficult and requires an extensive degree of judgment, particularly where the matters involve indeterminate claims for monetary damages, may involve fines, penalties or punitive damages that are discretionary in amount, involve a large number of claimants or regulatory authorities, represent a change in regulatory policy, present novel legal theories, are in the early stages of the proceedings, are subject to appeal or could result in a change in business practices.  In addition, because most legal proceedings are resolved over long periods of time, potential losses are subject to change due to, among other things, new developments, changes in litigation strategy, the outcome of intermediate procedural and substantive rulings and other parties’ settlement posture and their evaluation of the strength or weakness of their case against us.  Except as specifically noted above under “CMS Actions” with respect to the two ongoing RADV audits for the 2007 contract year, we are currently unable to predict the ultimate outcome of, or reasonably estimate the losses or a range of losses resulting from, the matters described above, and it is reasonably possible that their outcome could be material to us.

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Dividend Restrictions and Statutory Surplus (Details) (Insurance and HMO [Member], USD $)	9 Months Ended
	Sep. 30, 2011	Dec. 31, 2010
Insurance and HMO [Member]
Dividend Restrictions and Statutory Surplus [Line Items]
Dividends available	$ 372,000,000
Proceeds from dividends received	1,100,000,000
Statutory capital and surplus	$ 6,500,000,000	$ 6,200,000,000

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Capital Stock - Dividends (Details) (USD $) In Millions, except Per Share data	3 Months Ended			9 Months Ended
	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Sep. 30, 2011	Sep. 20, 2011	May 20, 2011	Feb. 03, 2011	Jan. 31, 2011
Class of Stock Disclosures [Abstract]
Quarterly dividend per share (in dollars per share)				$ 0.15
Prior period annual dividend per share (in dollars per share)								$ 0.04
Dividends Amount Per Share					$ 0.15	$ 0.15	$ 0.15
Total Dividends	$ 54.3	$ 55.9	$ 57.0

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Operating Expenses (Details) (USD $) In Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Selling expenses	$ 269.1		$ 304.8		$ 827.0		$ 928.8
General and administrative expenses:
Salaries and related benefits	918.0	[1]	761.6	[1]	2,468.6	[1]	2,292.3	[1]
Other general and administrative expenses	629.2	[2]	487.7	[2]	1,675.9	[2]	1,408.3	[2]
Total general and administrative expenses	1,547.2		1,249.3		4,144.5		3,700.6
Total operating expenses	1,816.3		1,554.1		4,971.5		4,629.4
Voluntary early retirement expense (pretax)	137.0				137.0
Litigation settlement, pretax			$ 41.0				$ 131.0

[1] Includes a one-time pretax charge of $137.0 million in the three and nine months ended September 30, 2011 related to the voluntary early retirement program that we announced in July 2011. Refer to the reconciliation of operating earnings to net income in Note 15 beginning on page 29 for additional information.

[2] Includes litigation-related insurance proceeds of $41.0 million and $131.0 million for the three and nine months ended September 30, 2010, respectively. Refer to the reconciliation of operating earnings to net income in Note 15 beginning on page 29 for additional information.

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Investments (Tables)

9 Months Ended

Sep. 30, 2011

Investments [Abstract]

Total investments

Total investments at September 30, 2011 and December 31, 2010 were as follows:

	September 30, 2011						December 31, 2010
(Millions)	Current		Long-term		Total		Current		Long-term		Total
Debt and equity securities available for sale	$	1,986.2	$	14,785.5	$	16,771.7	$	2,111.9	$	14,849.7	$	16,961.6
Mortgage loans	49.0		1,556.8		1,605.8		55.2		1,454.6		1,509.8
Other investments	7.5		1,321.5		1,329.0		2.6		1,242.0		1,244.6
Total investments	$	2,042.7	$	17,663.8	$	19,706.5	$	2,169.7	$	17,546.3	$	19,716.0

Debt and equity securities available for sale

Debt and equity securities available for sale at September 30, 2011 and December 31, 2010 were as follows:

(Millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses				Fair Value
September 30, 2011
Debt securities:
U.S. government securities	$	1,358.0	$	171.1	$	(.4	)		$	1,528.7
States, municipalities and political subdivisions	2,470.5		184.6		(4.9		)		2,650.2
U.S. corporate securities	6,268.4		671.5		(43.6		)		6,896.3
Foreign securities	2,664.0		259.7		(43.1		)		2,880.6
Residential mortgage-backed securities	811.3		51.8		(.1		)	(1)	863.0
Commercial mortgage-backed securities	1,269.4		80.1		(14.3		)	(1)	1,335.2
Other asset-backed securities	397.9		21.4		(4.1		)	(1)	415.2
Redeemable preferred securities	168.9		11.2		(14.8		)		165.3
Total debt securities	15,408.4		1,451.4		(125.3		)		16,734.5
Equity securities	40.2		5.0		(8.0		)		37.2
Total debt and equity securities (2)	$	15,448.6	$	1,456.4	$	(133.3	)		$	16,771.7
December 31, 2010
Debt securities:
U.S. government securities	$	1,293.5	$	80.8	$	(.6	)		$	1,373.7
States, municipalities and political subdivisions	2,288.8		54.4		(46.9		)		2,296.3
U.S. corporate securities	6,731.5		553.0		(21.9		)		7,262.6
Foreign securities	2,667.4		231.1		(21.2		)		2,877.3
Residential mortgage-backed securities	1,089.2		53.6		(2.8		)	(1)	1,140.0
Commercial mortgage-backed securities	1,226.4		99.5		(13.7		)	(1)	1,312.2
Other asset-backed securities	447.6		21.1		(4.8		)	(1)	463.9
Redeemable preferred securities	196.7		12.3		(12.7		)		196.3
Total debt securities	15,941.1		1,105.8		(124.6		)		16,922.3
Equity securities	35.3		5.6		(1.6		)		39.3
Total debt and equity securities (2)	$	15,976.4	$	1,111.4	$	(126.2	)		$	16,961.6

⁽¹⁾  At September 30, 2011 and December 31, 2010, we held securities for which we recognized $28.0 million and $38.3 million, respectively, of non-credit-related impairments in other comprehensive income in the past. These securities had a net unrealized capital gain at September 30, 2011 and December 31, 2010 of $8.2 million and $3.9 million, respectively.

⁽²⁾  Investment risks associated with our experience-rated and discontinued products generally do not impact our operating results (refer to Note 17 beginning on page 30 for additional information on our accounting for discontinued products).  At September 30, 2011, debt and equity securities with a fair value of $4.1 billion, gross unrealized capital gains of $483.4 million and gross unrealized capital losses of $55.7 million and, at December 31, 2010, debt and equity securities with a fair value of $4.1 billion, gross unrealized capital gains of $339.5 million and gross unrealized capital losses of $38.1 million were included in total debt and equity securities, but support our experience-rated and discontinued products.  Changes in net unrealized capital gains (losses) on these securities are not reflected in accumulated other comprehensive income

Fair value of debt securities by contractual maturity

The fair value of debt securities at September 30, 2011 is shown below by contractual maturity.  Actual maturities may differ from contractual maturities because securities may be restructured, called or prepaid.

(Millions)	Fair Value
Due to mature:
Less than one year	$	694.5
One year through five years	3,018.1
After five years through ten years	5,213.8
Greater than ten years	5,194.7
Residential mortgage-backed securities	863.0
Commercial mortgage-backed securities	1,335.2
Other asset-backed securities	415.2
Total	$	16,734.5

Debt and Equity Securities in an Unrealized Capital Loss Position

Summarized below are the debt and equity securities we held at September 30, 2011 and December 31, 2010 that were in an unrealized capital loss position, aggregated by the length of time the investments have been in that position:

	Less than 12 months				Greater than 12 months				Total (1)
(Millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
September 30, 2011
Debt securities:
U.S. government securities	$	50.9	$	.1	$	15.1	$	.3	$	66.0	$	.4
States, municipalities and political subdivisions	90.8		1.0		93.4		3.9		184.2		4.9
U.S. corporate securities	947.2		40.7		74.1		2.9		1,021.3		43.6
Foreign securities	659.0		34.8		34.4		8.3		693.4		43.1
Residential mortgage-backed securities	—		—		3.1		.1		3.1		.1
Commercial mortgage-backed securities	263.9		9.0		43.2		5.3		307.1		14.3
Other asset-backed securities	5.7		.3		3.9		3.8		9.6		4.1
Redeemable preferred securities	38.5		1.7		35.5		13.1		74.0		14.8
Total debt securities	2,056.0		87.6		302.7		37.7		2,358.7		125.3
Equity securities	15.9		7.6		10.7		.4		26.6		8.0
Total debt and equity securities (1)	$	2,071.9	$	95.2	$	313.4	$	38.1	$	2,385.3	$	133.3
December 31, 2010
Debt securities:
U.S. government securities	$	8.4	$	.2	$	19.8	$	.4	$	28.2	$	.6
States, municipalities and political subdivisions	964.9		37.6		82.7		9.3		1,047.6		46.9
U.S. corporate securities	665.8		17.0		210.2		4.9		876.0		21.9
Foreign securities	375.9		14.6		34.6		6.6		410.5		21.2
Residential mortgage-backed securities	103.7		2.6		6.6		.2		110.3		2.8
Commercial mortgage-backed securities	103.7		2.4		78.5		11.3		182.2		13.7
Other asset-backed securities	85.9		2.0		4.9		2.8		90.8		4.8
Redeemable preferred securities	4.5		—		94.3		12.7		98.8		12.7
Total debt securities	2,312.8		76.4		531.6		48.2		2,844.4		124.6
Equity securities	.5		—		9.5		1.6		10.0		1.6
Total debt and equity securities (1)	$	2,313.3	$	76.4	$	541.1	$	49.8	$	2,854.4	$	126.2

⁽¹⁾  At September 30, 2011 and December 31, 2010, debt and equity securities in an unrealized capital loss position of $55.7 million and $38.1 million, respectively, and with related fair value of $612.0 million and $650.5 million, respectively, related to experience-rated and discontinued products.

Maturity dates for debt securities

The maturity dates for debt securities in an unrealized capital loss position at September 30, 2011 were as follows:

	Supporting discontinued and experience-rated products				Supporting remaining products				Total
(Millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Due to mature:
Less than one year	$	1.0	$	—	$	139.8	$	2.4	$	140.8	$	2.4
One year through five years	54.7		1.6		331.5		9.6		386.2		11.2
After five years through ten years	258.4		12.6		672.5		28.1		930.9		40.7
Greater than ten years	215.5		30.8		365.5		21.7		581.0		52.5
Residential mortgage-backed securities	—		—		3.1		.1		3.1		.1
Commercial mortgage-backed securities	51.2		2.4		255.9		11.9		307.1		14.3
Other asset-backed securities	5.0		.3		4.6		3.8		9.6		4.1
Total	$	585.8	$	47.7	$	1,772.9	$	77.6	$	2,358.7	$	125.3

Net realized capital gains (losses)

Net realized capital gains for the three and nine months ended September 30, 2011 and 2010, excluding amounts related to experience-rated contract holders and discontinued products, were as follows:

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
(Millions)	2011			2010			2011			2010
OTTI losses on debt securities	$	(3.7	)	$	(9.0	)	$	(8.2	)	$	(32.7	)
Portion of OTTI losses on debt securities recognized   in other comprehensive income	—			6.0			—			12.7
Net OTTI losses on debt securities recognized in earnings	(3.7		)	(3.0		)	(8.2		)	(20.0		)
Net realized capital gains, excluding OTTI losses on debt securities	82.3			82.6			147.9			219.7
Net realized capital gains	$	78.6		$	79.6		$	139.7		$	199.7

Proceeds and related gross realized capital gains and losses from the sale of debt securities

Excluding amounts related to experience-rated and discontinued products, proceeds from the sale of debt securities and the related gross realized capital gains and losses for the three and nine months ended September 30, 2011 and 2010 were as follows:

	For the Three Months Ended						For the Nine Months Ended
	September 30,						September 30,
(Millions)	2011			2010			2011			2010
Proceeds on sales	$	1,927.1		$	2,373.3		$	5,019.0		$	5,938.3
Gross realized capital gains	107.5			108.8			216.7			304.2
Gross realized capital losses	(5.0		)	(6.4		)	(30.1		)	(26.4		)

Activity in mortgage loan portfolio

 During the three and nine months ended September 30, 2011 and 2010 we had the following activity in our mortgage loan portfolio:

	For the Three Months Ended				For the Nine Months Ended
	September 30,				September 30,
(Millions)	2011		2010		2011		2010
New mortgage loans	$	56.1	$	37.9	$	184.6	$	53.2
Mortgage loans fully repaid	15.4		21.2		54.6		74.3
Mortgage loans foreclosed	—		8.5		—		20.0

Mortgage loan internal credit rating

 Based upon our most recent assessment at September 30, 2011 and December 31, 2010, our mortgage loans were given the following credit quality indicators:

(In Millions)	September 30, 2011		December 31, 2010
1	$	104.5	$	99.4
2 to 4	1,374.7		1,301.5
5	91.3		86.1
6 and 7	35.3		22.8
Total	$	1,605.8	$	1,509.8

Sources of net investment income

Sources of net investment income for the three and nine months ended September 30, 2011 and 2010 were as follows:

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
(Millions)	2011			2010			2011			2010
Debt securities	$	205.1		$	225.8		$	628.5		$	694.3
Mortgage loans	26.5			25.4			75.8			78.4
Other investments	9.5			4.4			45.4			25.5
Gross investment income	241.1			255.6			749.7			798.2
Less:  investment expenses	(7.5		)	(7.4		)	(22.2		)	(21.1		)
Net investment income (1)	$	233.6		$	248.2		$	727.5		$	777.1

⁽¹⁾  Investment risks associated with our experience-rated and discontinued products generally do not impact our operating results (refer to Note 17 beginning on page 30 for additional information on our accounting for discontinued products).  Net investment income includes $85.8 million and $252.8 million for the three and nine months ended September 30, 2011, respectively, and $78.3 million and $246.7 million for the three and nine months ended September 30, 2010, respectively, related to investments supporting our experience-rated and discontinued products.

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Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Shareholders' equity:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	2,600,000,000	2,700,000,000
Common stock, shares issued	362,300,000	384,400,000
Common stock, shares outstanding	362,300,000	384,400,000

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Segment Information

9 Months Ended

Sep. 30, 2011

Segment Reporting [Abstract]

Segment Information

15. Segment Information

Our operations are conducted in three business segments:  Health Care, Group Insurance and Large Case Pensions.  Our Corporate Financing segment is not a business segment; it is added to our business segments in order to reconcile to our consolidated results.  The Corporate Financing segment includes interest expense on our outstanding debt and the financing components of our pension and OPEB plan expense (the service cost components of this expense are allocated to our business segments).

Summarized financial information of our segments for the three and nine months ended September 30, 2011 and 2010 was as follows:

(Millions)	Health Care		Group Insurance		Large Case Pensions		Corporate Financing			Total Company
Three Months Ended September 30, 2011
Revenue from external customers	$	7,695.9	$	426.6	$	40.6	$	—		$	8,163.1
Operating earnings (loss) (1)	525.7		37.9		4.4		(39.6		)	528.4
Three Months Ended September 30, 2010
Revenue from external customers	$	7,733.3	$	436.2	$	41.5	$	—		$	8,211.0
Operating earnings (loss) (1)	442.2		34.6		5.6		(62.8		)	419.6
Nine Months Ended September 30, 2011
Revenue from external customers	$	22,919.1	$	1,288.1	$	133.1	$	—		$	24,340.3
Operating earnings (loss) (1)	1,593.9		125.2		16.4		(124.1		)	1,611.4
Nine Months Ended September 30, 2010
Revenue from external customers	$	23,258.1	$	1,345.5	$	125.7	$	—		$	24,729.3
Operating earnings (loss) (1)	1,369.7		107.5		21.4		(198.2		)	1,300.4

⁽¹⁾  Operating earnings (loss) excludes net realized capital gains or losses and the other items described in the reconciliation on page 30.

A reconciliation of operating earnings ⁽¹⁾ to net income for the three and nine months ended September 30, 2011 and 2010 was as follows:

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
(Millions)	2011			2010		2011			2010
Operating earnings	$	528.4		$	419.6	$	1,611.4		$	1,300.4
Voluntary early retirement program	(89.1		)	—		(89.1		)	—
Litigation-related insurance proceeds	—			26.6		—			85.1
Net realized capital gains	51.1			51.4		90.8			165.7
Net income	$	490.4		$	497.6	$	1,613.1		$	1,551.2

⁽¹⁾  In addition to net realized capital gains, the following items are excluded from operating earnings because we believe they neither relate to the ordinary course of our business nor reflect our underlying business performance:

^•  In July 2011, we announced a voluntary early retirement program (the "Program").  In connection with the Program, we recorded a one-time charge of $89.1 million ($137.0 million pretax) during the three and nine months ended September 30, 2011.

^•  Following a Pennsylvania Supreme Court ruling in June 2009, we recorded litigation-related insurance proceeds of $26.6 million ($41.0 million pretax) and $85.1 million ($131.0 million pretax) for the three and nine months ended September 30, 2010, respectively, from our liability insurers related to certain litigation we settled in 2003.  

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Investments - Debt and Equity Securities (Details) (USD $) In Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2011		Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 15,448.6	[1]	$ 15,976.4	[1]
Available-for-sale Securities, Gross Unrealized Gains	1,456.4	[1]	1,111.4	[1]
Available-for-sale Securities, Gross Unrealized Losses	(133.3)	[1]	(126.2)	[1]
Available-for-sale Securities, Fair Value Disclosure	16,771.7	[1]	16,961.6	[1]
Non Credit Related Impairments	28.0		38.3
Net Unrealized Capital (Loss) Gains	8.2		3.9
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	15,408.4		15,941.1
Available-for-sale Securities, Gross Unrealized Gains	1,451.4		1,105.8
Available-for-sale Securities, Gross Unrealized Losses	(125.3)		(124.6)
Available-for-sale Securities, Fair Value Disclosure	16,734.5		16,922.3
US Government Agencies Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,358.0		1,293.5
Available-for-sale Securities, Gross Unrealized Gains	171.1		80.8
Available-for-sale Securities, Gross Unrealized Losses	(0.4)		(0.6)
Available-for-sale Securities, Fair Value Disclosure	1,528.7		1,373.7
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	2,470.5		2,288.8
Available-for-sale Securities, Gross Unrealized Gains	184.6		54.4
Available-for-sale Securities, Gross Unrealized Losses	(4.9)		(46.9)
Available-for-sale Securities, Fair Value Disclosure	2,650.2		2,296.3
Domestic Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	6,268.4		6,731.5
Available-for-sale Securities, Gross Unrealized Gains	671.5		553.0
Available-for-sale Securities, Gross Unrealized Losses	(43.6)		(21.9)
Available-for-sale Securities, Fair Value Disclosure	6,896.3		7,262.6
Foreign Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	2,664.0		2,667.4
Available-for-sale Securities, Gross Unrealized Gains	259.7		231.1
Available-for-sale Securities, Gross Unrealized Losses	(43.1)		(21.2)
Available-for-sale Securities, Fair Value Disclosure	2,880.6		2,877.3
Residential Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	811.3		1,089.2
Available-for-sale Securities, Gross Unrealized Gains	51.8		53.6
Available-for-sale Securities, Gross Unrealized Losses	(0.1)	[2]	(2.8)	[2]
Available-for-sale Securities, Fair Value Disclosure	863.0		1,140.0
Commercial Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,269.4		1,226.4
Available-for-sale Securities, Gross Unrealized Gains	80.1		99.5
Available-for-sale Securities, Gross Unrealized Losses	(14.3)	[2]	(13.7)	[2]
Available-for-sale Securities, Fair Value Disclosure	1,335.2		1,312.2
Other Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	397.9		447.6
Available-for-sale Securities, Gross Unrealized Gains	21.4		21.1
Available-for-sale Securities, Gross Unrealized Losses	(4.1)	[2]	(4.8)	[2]
Available-for-sale Securities, Fair Value Disclosure	415.2		463.9
Redeemable Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	168.9		196.7
Available-for-sale Securities, Gross Unrealized Gains	11.2		12.3
Available-for-sale Securities, Gross Unrealized Losses	(14.8)		(12.7)
Available-for-sale Securities, Fair Value Disclosure	165.3		196.3
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	40.2		35.3
Available-for-sale Securities, Gross Unrealized Gains	5.0		5.6
Available-for-sale Securities, Gross Unrealized Losses	(8.0)		(1.6)
Available-for-sale Securities, Fair Value Disclosure	37.2		39.3
Supporting Discontinued And Experience Rated Products [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Unrealized Gains	483.4		339.5
Available-for-sale Securities, Gross Unrealized Losses	55.7		38.1
Available-for-sale Securities, Fair Value Disclosure	$ 4,100.0		$ 4,100.0

[1] Investment risks associated with our experience-rated and discontinued products generally do not impact our operating results (refer to Note 17 beginning on page 30 for additional information on our accounting for discontinued products). At September 30, 2011, debt and equity securities with a fair value of $4.1 billion, gross unrealized capital gains of $483.4 million and gross unrealized capital losses of $55.7 million and, at December 31, 2010, debt and equity securities with a fair value of $4.1 billion, gross unrealized capital gains of $339.5 million and gross unrealized capital losses of $38.1 million were included in total debt and equity securities, but support our experience-rated and discontinued products. Changes in net unrealized capital gains (losses) on these securities are not reflected in accumulated other comprehensive income

[2] At September 30, 2011 and December 31, 2010, we held securities for which we recognized $28.0 million and $38.3 million, respectively, of non-credit-related impairments in other comprehensive income in the past. These securities had a net unrealized capital gain at September 30, 2011 and December 31, 2010 of $8.2 million and $3.9 million, respectively.

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Discontinued Products

9 Months Ended

Sep. 30, 2011

Discontinued Products [Abstract]

Discontinued Products

17. Discontinued Products

Prior to 1993, we sold single-premium annuities (“SPAs”) and guaranteed investment contracts (“GICs”), primarily to employer sponsored pension plans.  In 1993, we discontinued selling these products to Large Case Pensions customers, and now we refer to these products as discontinued products.

We discontinued selling these products because they were generating losses for us, and we projected that they would continue to generate losses over their life (which is currently greater than 30 years for SPAs and less than 5 years for GICs); so we established a reserve for anticipated future losses at the time of discontinuance.  This reserve represents the present value (at the risk-free rate of return at the time of discontinuance, consistent with the duration of the liabilities) of the difference between the expected cash flows from the assets supporting these products and the cash flows expected to be required to meet the obligations of the outstanding contracts.  Because we projected anticipated cash shortfalls in our discontinued products, at the time of discontinuance we established a receivable from Large Case Pensions’ continuing products (which is eliminated in consolidation).

Key assumptions in setting this reserve include future investment results, payments to retirees, mortality and retirement rates and the cost of asset management and customer service.  In 1997, we began the use of a bond default assumption to reflect historical default experience.  In 1995, we modified the mortality tables used in order to reflect a more up-to-date 1994 Uninsured Pensioner’s Mortality table.  Other than these changes, since 1993 there have been no significant changes to the assumptions underlying the reserve.

We review the adequacy of this reserve quarterly based on actual experience.  As long as our expectation of future losses remains consistent with prior projections, the results of the discontinued products are applied to the reserve and do not affect net income.  However, if actual or expected future losses are greater than we currently estimate, we may increase the reserve, which could adversely impact net income.  If actual or expected future losses are less than we currently estimate, we may decrease the reserve, which could favorably impact net income.  The current reserve reflects management’s best estimate of anticipated future losses.  The reserve for anticipated future losses is included in future policy benefits on our balance sheet.

The activity in the reserve for anticipated future losses on discontinued products for the nine months ended September 30, 2011 and 2010 was as follows (pretax):

(Millions)	2011		2010
Reserve, beginning of period	$	884.8	$	789.2
Operating income (loss)	4.7		(19.3		)
Net realized capital gains	19.3		84.2
Reserve, end of period	$	908.8	$	854.1

During the nine months ended September 30, 2011, our discontinued products reflected net realized capital gains (primarily attributable to gains from the sale of debt securities partially offset by losses from derivative transactions) and operating income. We evaluated these results against our expectations of future cash flows assumed in estimating the reserve and concluded that no adjustment to the reserve is required at September 30, 2011.

Assets and liabilities supporting discontinued products at September 30, 2011 and December 31, 2010 were asfollows: ⁽¹⁾ 

(Millions)	2011		2010
Assets:
Debt and equity securities available for sale	$	2,613.1	$	2,611.9
Mortgage loans	455.5		498.8
Other investments	654.5		601.6
Total investments	3,723.1		3,712.3
Other assets	81.7		90.4
Collateral received under securities loan agreements	—		35.1
Current and deferred income taxes	23.4		20.7
Receivable from continuing products (2)	515.3		492.4
Total assets	$	4,343.5	$	4,350.9
Liabilities:
Future policy benefits	$	3,040.9	$	3,162.2
Policyholders' funds	8.3		10.2
Reserve for anticipated future losses on discontinued products	908.8		884.8
Collateral payable under securities loan agreements	—		35.1
Other liabilities (3)	385.5		258.6
Total liabilities	$	4,343.5	$	4,350.9

⁽¹⁾  Assets supporting the discontinued products are distinguished from assets supporting continuing products.

⁽²⁾  The receivable from continuing products is eliminated in consolidation.

⁽³⁾  Net unrealized capital gains on the available-for-sale debt securities are included in other liabilities and are not reflected in consolidated shareholders’ equity.

The distributions on our discontinued products consisted of scheduled contract maturities, settlements and benefit payments of $102 million and $311 million for the three and nine months ended September 30, 2011, respectively, and $107 million and $321 million for the three and nine months ended September 30, 2010, respectively. Participant-directed withdrawals from our discontinued products were not significant in the three or nine months ended September 30, 2011 or 2010.  Cash required to fund these distributions was provided by earnings and scheduled payments on, and sales of, invested assets.

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Reinsurance (Details) (USD $) In Millions	Sep. 30, 2011
Reinsurance Disclosures [Abstract]
Amount of collateralized excess of loss on reinsurance coverage	$ 150

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Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities:
Net income	$ 1,613.1	$ 1,551.2
Adjustments to reconcile net income to net cash provided by operating activities:
Net realized capital gains	(139.7)	(199.7)
Depreciation and amortization	326.4	313.3
Equity in earnings of affiliates, net	(26.8)	(9.6)
Stock-based compensation expense	107.7	85.9
Accretion of net investment discount	(1.1)	(20.0)
Changes in assets and liabilities:
Accrued investment income	7.0	1.8
Premiums due and other receivables	(158.4)	(98.0)
Income taxes	157.8	206.0
Other assets and other liabilities	(116.5)	(588.7)
Health care and insurance liabilities	236.2	(398.5)
Other, net	8.1	2.9
Net cash provided by operating activities	2,013.8	846.6
Cash flows from investing activities:
Proceeds from sales and maturities of investments	7,704.0	8,796.4
Cost of investments	(7,100.8)	(8,324.9)
Additions to property, equipment and software	(227.2)	(217.1)
Cash used for acquisition, net of cash acquired	(1,130.2)	(0.1)
Net cash (used for) provided by investing activities	(754.2)	254.3
Cash flows from financing activities:
Net repayment of long-term debt	(900.0)	0
Net issuance of long-term debt	480.1	697.8
Net issuance (repayment) of short-term debt	449.9	(245.4)
Deposits and interest credited for investment contracts	3.8	4.5
Withdrawals of investment contracts	(6.6)	(8.1)
Common shares issued under benefit plans	117.9	12.1
Stock-based compensation tax benefits	31.7	4.2
Common shares repurchased	(1,227.6)	(932.4)
Dividends paid to shareholders	(112.9)	0
Collateral on interest rate swaps	(5.7)	(41.7)
Net cash used for financing activities	(1,169.4)	(509.0)
Net increase in cash and cash equivalents	90.2	591.9
Cash and cash equivalents, beginning of period	1,867.6	1,203.6
Cash and cash equivalents, end of period	1,957.8	1,795.5
Supplemental cash flow information:
Interest paid	169.0	156.4
Income taxes paid	$ 665.0	$ 569.3

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Financial Instruments

9 Months Ended

Sep. 30, 2011

Financial Instruments [Abstract]

Financial Instruments

9. Financial Instruments

The preparation of our consolidated financial statements in accordance with GAAP requires certain of our assets and liabilities to be reflected at their fair value, and others on another basis, such as an adjusted historical cost basis.  In this note, we provide details on the fair value of financial assets and liabilities and how we determine those fair values.  We present this information for those financial instruments that are measured at fair value for which the change in fair value impacts net income or other comprehensive income separately from other financial assets and liabilities.

Financial Instruments Measured at Fair Value in our Balance Sheets

Certain of our financial instruments are measured at fair value in our balance sheets.  The fair values of these instruments are based on valuations that include inputs that can be classified within one of three levels of a hierarchy established by GAAP.  The following are the levels of the hierarchy and a brief description of the type of valuation information (“inputs”) that qualifies a financial asset or liability for each level:

◦ Level 1 – Unadjusted quoted prices for identical assets or liabilities in active markets.

◦ Level 2 – Inputs other than Level 1 that are based on observable market data.  These include: quoted prices for similar assets in active markets, quoted prices for identical assets in inactive markets, inputs that are observable that are not prices (such as interest rates and credit risks) and inputs that are derived from or corroborated by observable markets.

◦ Level 3 – Developed from unobservable data, reflecting our own assumptions.

Financial assets and liabilities are classified based upon the lowest level of input that is significant to the valuation.  When quoted prices in active markets for identical assets and liabilities are available, we use these quoted market prices to determine the fair value of financial assets and liabilities and classify these assets and liabilities as Level 1.  In other cases where a quoted market price for identical assets and liabilities in an active market is either not available or not observable, we estimate fair value using valuation methodologies based on available and observable market information or by using a matrix pricing model.  These financial assets and liabilities would then be classified as Level 2.  If quoted market prices are not available, we determine fair value using broker quotes or an internal analysis of each investment’s financial performance and cash flow projections.  Thus, financial assets and liabilities may be classified in Level 3 even though there may be some significant inputs that may be observable.

The following is a description of the valuation methodologies used for our financial assets and liabilities that are measured at fair value, including the general classification of such assets and liabilities pursuant to the valuation hierarchy.

Debt Securities – Where quoted prices are available in an active market, our debt securities are classified in Level 1 of the fair value hierarchy.  Our Level 1 debt securities are comprised primarily of U.S. Treasury securities.  If Level 1 valuations are not available, the fair value is determined using models such as matrix pricing, which use quoted market prices of debt securities with similar characteristics, or discounted cash flows to estimate fair value.  We obtained one price for each of our Level 2 debt securities and did not adjust any of these prices at September 30, 2011 or December 31, 2010.

We also value certain debt securities using Level 3 inputs.  For Level 3 debt securities, fair values are determined by outside brokers or, in the case of certain private placement securities, are priced internally.  Outside brokers determine the value of these debt securities through a combination of their knowledge of the current pricing environment and market flows.  We obtained one non-binding broker quote for each of these Level 3 debt securities and did not adjust any of these quotes at September 30, 2011 or December 31, 2010.  The total fair value of our broker quoted securities was approximately $132 million at September 30, 2011 and $153 million at December 31, 2010.  Examples of these Level 3 debt securities include certain U.S. and foreign corporate securities and certain of our commercial mortgage-backed securities as well as other asset-backed securities.  For some of our private placement securities, our internal staff determines the value of these debt securities by analyzing spreads of corporate and sector indices as well as interest spreads of comparable public bonds.  Examples of these Level 3 debt securities include certain U.S. securities and certain tax-exempt municipal securities.

Equity Securities – We currently have two classifications of equity securities:  those that are publicly traded and those that are privately held.  Our publicly-traded securities are classified as Level 1 because quoted prices are available for these securities in an active market.  For privately-held equity securities, there is no active market; therefore, we classify these securities as Level 3 because we price these securities through an internal analysis of each investment’s financial statements and cash flow projections.

Derivatives – Our derivative instruments are valued using models that primarily use market observable inputs and therefore are classified as Level 2 because they are traded in markets where quoted market prices are not readily available.

Financial assets and liabilities measured at fair value on a recurring basis in our balance sheets at September 30, 2011 and December 31, 2010 were as follows:

(Millions)	Level 1		Level 2		Level 3		Total
September 30, 2011
Assets:
Debt securities:
U.S. government securities	$	1,277.6	$	251.1	$	—	$	1,528.7
States, municipalities and political subdivisions	—		2,648.5		1.7		2,650.2
U.S. corporate securities	—		6,834.6		61.7		6,896.3
Foreign securities	—		2,825.8		54.8		2,880.6
Residential mortgage-backed securities	—		863.0		—		863.0
Commercial mortgage-backed securities	—		1,306.5		28.7		1,335.2
Other asset-backed securities	—		367.6		47.6		415.2
Redeemable preferred securities	—		138.5		26.8		165.3
Total debt securities	1,277.6		15,235.6		221.3		16,734.5
Equity securities	.8		—		36.4		37.2
Derivatives	—		7.5		—		7.5
Total	$	1,278.4	$	15,243.1	$	257.7	$	16,779.2
Liabilities:
Derivatives	$	—	$	4.2	$	—	$	4.2
December 31, 2010
Assets:
Debt securities:
U.S. government securities	$	1,081.0	$	292.7	$	—	$	1,373.7
States, municipalities and political subdivisions	—		2,292.7		3.6		2,296.3
U.S. corporate securities	—		7,201.9		60.7		7,262.6
Foreign securities	—		2,822.4		54.9		2,877.3
Residential mortgage-backed securities	—		1,140.0		—		1,140.0
Commercial mortgage-backed securities	—		1,275.3		36.9		1,312.2
Other asset-backed securities	—		407.4		56.5		463.9
Redeemable preferred securities	—		178.5		17.8		196.3
Total debt securities	1,081.0		15,610.9		230.4		16,922.3
Equity securities	1.4		—		37.9		39.3
Derivatives	—		2.6		—		2.6
Total	$	1,082.4	$	15,613.5	$	268.3	$	16,964.2
Liabilities:
Derivatives	$	—	$	6.5	$	—	$	6.5

The change in the balance of Level 3 financial assets for the three and nine months ended September 30, 2011 is as follows:

(Millions)	Foreign Securities				Commercial Mortgage-backed Securities			Equity Securities			Other				Total
Three Months Ended September 30, 2011
Beginning balance	$	50.1			$	39.8		$	33.2		$	130.0			$	253.1
Net realized and unrealized capital gains (losses):
Included in earnings	.1				1.1			—			(.6		)		.6
Included in other comprehensive income	(1.5		)		(2.2		)	—			1.0				(2.7		)
Other (1)	(1.1		)		—			(1.8		)	(3.8		)		(6.7		)
Purchases	7.2				—			5.3			12.1				24.6
Sales	—				—			(.3		)	(6.3		)		(6.6		)
Settlements	—				(10.0		)	—			(5.7		)		(15.7		)
Transfers into Level 3	—				—			—			11.1			(2)	11.1
Ending balance	$	54.8			$	28.7		$	36.4		$	137.8			$	257.7
Amount of Level 3 net unrealized losses
included in net income	$	—			$	—		$	—		$	—			$	—
(Millions)	Foreign Securities				Commercial Mortgage-backed Securities			Equity Securities			Other				Total
Nine Months Ended September 30, 2011
Beginning balance	$	54.9			$	36.9		$	37.9		$	138.6			$	268.3
Net realized and unrealized capital gains (losses):
Included in earnings	1.1				2.6			—			(2.2		)		1.5
Included in other comprehensive income	(2.0		)		.8			—			1.2				—
Other (1)	(.4		)		—			(6.7		)	(3.8		)		(10.9		)
Purchases	27.4				—			5.5			22.7				55.6
Sales	(16.4		)		—			(.3		)	(10.0		)		(26.7		)
Settlements	(.8		)		(11.6		)	—			(19.8		)		(32.2		)
Transfers (out of) into Level 3	(9.0		)	(2)	—			—			11.1			(2)	2.1
Ending balance	$	54.8			$	28.7		$	36.4		$	137.8			$	257.7
Amount of Level 3 net unrealized losses
included in net income	$	—			$	—		$	—		$	(.2	)		$	(.2	)

⁽¹⁾  Reflects realized and unrealized capital gains and losses on investments supporting our experience-rated and discontinued products, which do not impact our operating results.

⁽²⁾  Amounts represent gross transfers (out of) into Level 3.

The change in the balance of Level 3 financial assets for the three and nine months ended September 30, 2010 was as follows:

	Three Months Ended													Nine Months Ended
	September 30, 2010													September 30, 2010
(Millions)	U.S.  Corporate  Securities			Foreign  Securities				Other			Total			U.S. Corporate  Securities			Foreign  Securities				Other			Total
Beginning balance	$	85.1			$	50.9		$	169.1		$	305.1		$	75.3			$	199.0		$	209.2		$	483.5
Net realized and unrealized gains (losses):
Included in earnings	(.1		)		1.5			.3			1.7			(.4		)		8.2			4.7			12.5
Included in other comprehensive income	(.9		)		.4			13.8			13.3			(1.7		)		(3.2		)	25.2			20.3
Other (1)	—				.8			1.8			2.6			(.2		)		1.8			(3.7		)	(2.1		)
Purchases, sales and maturities	3.3				(7.0		)	(1.8		)	(5.5		)	(11.3		)		(92.0		)	(56.1		)	(159.4		)
Transfers out of Level 3	(27.1		)		(4.8		)	(12.1		)	(44.0		)	(1.4		)		(72.0		)	(8.2		)	(81.6		)
Ending balance	$	60.3			$	41.8		$	171.1		$	273.2		$	60.3			$	41.8		$	171.1		$	273.2
Amount of Level 3 net unrealized losses included in net income	$	—			$	—		$	(.4	)	$	(.4	)	$	—			$	—		$	(.4	)	$	(.4	)

⁽¹⁾  Reflects realized and unrealized capital gains and losses on investments supporting our experience-rated and discontinued products, which do not impact our operating results.

There were no material transfers into Level 3 during the three and nine months ended September 30, 2010. During 2010, certain investments previously classified as Level 3 were reclassified to Level 2 because we were able to obtain observable market data.

Financial Instruments Not Measured at Fair Value in our Balance Sheets

The following is a description of the valuation methodologies used for estimating the fair value of our financial assets and liabilities that are carried on our balance sheets at adjusted cost or contract value.

Mortgage loans: Fair values are estimated by discounting expected mortgage loan cash flows at market rates that reflect the rates at which similar loans would be made to similar borrowers.  These rates reflect our assessment of the credit quality and the remaining duration of the loans.  The fair value estimates of mortgage loans of lower credit quality, including problem and restructured loans, are based on the estimated fair value of the underlying collateral.

Investment contract liabilities:

•With a fixed maturity:  Fair value is estimated by discounting cash flows at interest rates currently

being offered by, or available to, us for similar contracts.

•Without a fixed maturity:  Fair value is estimated as the amount payable to the contract holder upon

demand.  However, we have the right under such contracts to delay payment of withdrawals that

may ultimately result in paying an amount different than that determined to be payable on demand.

Long-term debt:  Fair values are based on quoted market prices for the same or similar issued debt or, if no quoted market prices are available, on the current rates estimated to be available to us for debt of similar terms and remaining maturities.

The carrying value and estimated fair value of certain of our financial instruments at September 30, 2011 and December 31, 2010 were as follows:

	September 30, 2011				December 31, 2010
(Millions)	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Assets:
Mortgage loans	$	1,605.8	$	1,650.5	$	1,509.8	$	1,526.1
Liabilities:
Investment contract liabilities:
With a fixed maturity	37.4		37.7		41.7		42.7
Without a fixed maturity	533.6		553.9		511.5		510.9
Long-term debt	3,977.1		4,683.5		4,382.5		4,728.9

Separate Accounts Measured at Fair Value in our Balance Sheets

Separate Accounts assets in our Large Case Pensions business represent funds maintained to meet specific objectives of contract holders.  Since contract holders bear the investment risk of these assets, a corresponding Separate Accounts liability has been established equal to the assets.  These assets and liabilities are carried at fair value.  Net investment income and capital gains and losses accrue directly to such contract holders.  The assets of each account are legally segregated and are not subject to claims arising from our other businesses.  Deposits, withdrawals, net investment income and realized and unrealized capital gains and losses on Separate Accounts assets are not reflected in our statements of income, shareholders’ equity or cash flows.

Separate Accounts assets include debt and equity securities and derivative instruments.  The valuation methodologies used for these assets are similar to the methodologies described beginning on page 17.  Separate Accounts real estate assets were transitioned out of our business in the second quarter of 2010.  The following is a description of the valuation methodology used to price our real estate investments that are carried at fair value, including the general classification pursuant to the valuation hierarchy.

Real Estate – The values of the underlying real estate investments are estimated using generally accepted valuation techniques and give consideration to the investment structure.  An appraisal of the underlying real estate for each of these investments is performed annually.  In the quarters in which an investment is not appraised or its valuation is not updated, fair value is based on available market information.  The valuation of a real estate investment is adjusted only if there has been a significant change in economic circumstances related to the investment since acquisition or the most recent independent valuation and upon the appraiser’s review and concurrence with the valuation.  Further, these valuations have been prepared giving consideration to the income, cost and sales comparison approaches of estimating property value.  These valuations do not necessarily represent the prices at which the real estate investments would sell, since market prices of real estate investments can only be determined by negotiation between a willing buyer and seller.  Therefore, these investment values are classified as Level 3.

Separate Accounts financial assets at September 30, 2011 and December 31, 2010 were as follows:

	September 30, 2011										December 31, 2010
(Millions)	Level 1		Level 2			Level 3		Total			Level 1		Level 2		Level 3		Total
Debt securities	$	1,264.2	$	2,627.3		$	.1	$	3,891.6		$	1,059.7	$	2,524.9	$	56.0	$	3,640.6
Equity securities	839.3		—			—		839.3			1,231.9		—		—		1,231.9
Derivatives	—		(4.7		)	—		(4.7		)	—		.2		—		.2
Total (1)	$	2,103.5	$	2,622.6		$	.1	$	4,726.2		$	2,291.6	$	2,525.1	$	56.0	$	4,872.7

⁽¹⁾  Excludes $432.9 million and $422.6 million of cash and cash equivalents and other receivables at September 30, 2011 and December 31, 2010, respectively.

The change in the balance of Level 3 Separate Accounts financial assets for the three and nine months ended September 30, 2011 and 2010 was as follows:

	Three Months Ended			Nine Months Ended
	September 30, 2011			September 30, 2011
(Millions)	Debt Securities			Debt Securities
Beginning balance	$	39.0		$	56.0
Total losses accrued to contract holders	—			(15.6		)
Purchases, sales and settlements	(38.2		)	(39.1		)
Transfers out of Level 3	(.7		)	(1.2		)
Ending balance	$	.1		$	.1

	Three Months Ended			Nine Months Ended
	September 30, 2010			September 30, 2010
(Millions)	Debt Securities			Debt Securities			Real Estate			Total
Beginning balance	$	87.7		$	97.3		$	71.4		$	168.7
Total (losses) gains accrued to contract holders	(13.2		)	(43.8		)	5.2			(38.6		)
Purchases, sales and maturities	3.1			21.1			.2			21.3
Transfers out of Level 3  (1)	(3.7		)	(.7		)	(76.8		)	(77.5		)
Ending balance	$	73.9		$	73.9		$	—		$	73.9

⁽¹⁾  The transfers out of Level 3 for 2010 primarily represent real estate Separate Account assets that were transitioned out of our business in the second quarter of 2010.

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Financial Instruments - Balance Sheet Grouping (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Mortgage loans	$ 1,605.8	$ 1,509.8
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Investment contracts with a fixed maturity	37.4	41.7
Investment contracts without a fixed maturity	533.6	511.5
Long-term debt	3,977.1	4,382.5
Estimate of Fair Value, Fair Value Disclosure [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Mortgage loans	1,650.5	1,526.1
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Investment contracts with a fixed maturity	37.7	42.7
Investment contracts without a fixed maturity	553.9	510.9
Long-term debt	$ 4,683.5	$ 4,728.9

XML

Debt (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2011 years		May 31, 2011	Dec. 31, 2010		Jun. 30, 2010
Debt Instrument [Line Items]
Long-term debt	$ 3,977.1			$ 4,382.5
Interest Rate Cash Flow Hedges [Abstract]
Number of Interest Rate Derivatives Held	2					2
Notional Amount of Interest Rate Cash Flow Hedge Derivatives	250		250
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss)	(3)
Aggregate Notional Value of Interest Rate Swaps	250		250
Paid to the swap counterparty	9.0
Income (loss) recorded on termination of interest rate swaps	9
Amortization period of interest rate swaps terminated	10
Senior Notes, 5.75%, Due 2011 [Member]
Debt Instrument [Line Items]
Long-term debt	0	[1]		450.0	[1]
Stated interest rate (in hundredths)				5.75%
Senior Notes, 7.875%, Due 2011 [Member]
Debt Instrument [Line Items]
Long-term debt	0	[1]		449.9	[1]
Stated interest rate (in hundredths)				7.875%
Senior Notes, 6.0%, Due 2016 [Member]
Debt Instrument [Line Items]
Long-term debt	747.9			747.6
Stated interest rate (in hundredths)	6.00%			6.00%
Senior Notes, 6.5%, Due 2018 [Member]
Debt Instrument [Line Items]
Long-term debt	499.0			498.9
Stated interest rate (in hundredths)	6.50%			6.50%
Senior Notes, 3.95%, Due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt	742.4			741.7
Stated interest rate (in hundredths)	3.95%			3.95%
Senior Notes, 4.125%, Due 2021 [Member]
Debt Instrument [Line Items]
Long-term debt	493.3			0
Stated interest rate (in hundredths)	4.125%		4.125%	4.125%
Interest Rate Cash Flow Hedges [Abstract]
Face amount at maturity			500
Senior Notes, 6.625%, Due 2036 [Member]
Debt Instrument [Line Items]
Long-term debt	798.7			798.7
Stated interest rate (in hundredths)	6.625%			6.625%
Senior Notes, 6.75%, Due 2037 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 695.8			$ 695.7
Stated interest rate (in hundredths)	6.75%			6.75%

[1] The 5.75% senior notes and the 7.875% senior notes were repaid in June 2011 and March 2011, respectively.

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Discontinued Products (Details) (USD $) In Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010	Sep. 30, 2011		Sep. 30, 2010	Dec. 31, 2010
Reserve For Discontinued Products [Roll Forward]
Operating income (loss)	$ 751.4		$ 767.2	$ 2,470.9		$ 2,331.7
Assets:
Investments	19,706.5			19,706.5			19,716.0
Cash Collateral for Borrowed Securities	0			0			210.6
Assets	38,694.2			38,694.2			37,739.4
Liabilities:
Policyholders' funds	1,357.4			1,357.4			1,316.6
Liabilities	28,165.5			28,165.5			27,848.6
Debt And Equity Securities Available For Sale [Member]
Assets:
Investments	16,771.7			16,771.7			16,961.6
Debt And Equity Securities Available For Sale [Member] | Discontinued Products [Member]
Assets:
Investments	2,613.1	[1]		2,613.1	[1]		2,611.9	[1]
Mortgage Loans [Member]
Assets:
Investments	1,605.8			1,605.8			1,509.8
Mortgage Loans [Member] | Discontinued Products [Member]
Assets:
Investments	455.5	[1]		455.5	[1]		498.8	[1]
Other Investments [Member]
Assets:
Investments	1,329.0			1,329.0			1,244.6
Other Investments [Member] | Discontinued Products [Member]
Assets:
Investments	654.5	[1]		654.5	[1]		601.6	[1]
Discontinued Products [Member]
Reserve For Discontinued Products [Roll Forward]
Reserve, beginning of period				884.8		789.2
Operating income (loss)				4.7		(19.3)
Net realized capital gains				19.3		84.2
Reserve, end of period	908.8		854.1	908.8		854.1
Assets:
Investments	3,723.1	[1]		3,723.1	[1]		3,712.3	[1]
Other Assets	81.7	[1]		81.7	[1]		90.4	[1]
Cash Collateral for Borrowed Securities	0	[1]		0	[1]		35.1	[1]
Current and deferred income taxes	23.4	[1]		23.4	[1]		20.7	[1]
Receivable from continuing products	515.3	[1],[2]		515.3	[1],[2]		492.4	[1],[2]
Assets	4,343.5	[1]		4,343.5	[1]		4,350.9	[1]
Liabilities:
Liability for Future Policy Benefits	3,040.9			3,040.9			3,162.2
Policyholders' funds	8.3			8.3			10.2
Reserve for anticipated future losses on discontinued products	908.8		854.1	908.8		854.1
Collateral payable under securities loan agreements	0			0			35.1
Other Liabilities	385.5	[3]		385.5	[3]		258.6	[3]
Liabilities	4,343.5			4,343.5			4,350.9
Scheduled Contract Maturities, Settlements And Benefit Payments	$ 102		$ 107	$ 311		$ 321

[1] Assets supporting the discontinued products are distinguished from assets supporting continuing products.

[2] The receivable from continuing products is eliminated in consolidation.

[3] Net unrealized capital gains on the available-for-sale debt securities are included in other liabilities and are not reflected in consolidated shareholders’ equity.

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Capital Stock (Tables)

9 Months Ended

Sep. 30, 2011

Class of Stock Disclosures [Abstract]

Dividends declared

During the nine months ended September 30, 2011 our Board declared the following cash dividends:

Date Declared	Dividend Amount Per Share		Stockholders of Record Date	Date Paid/ To be Paid	Total Dividends (Millions)
February 3, 2011	$	.15	April 14, 2011	April 29, 2011	$	57.0
May 20, 2011	.15		July 14, 2011	July 29, 2011	55.9
September 23, 2011	.15		October 13, 2011	October 28, 2011	54.3

XML

Dividend Restrictions and Statutory Surplus

9 Months Ended

Sep. 30, 2011

Dividend Restrictions and Statutory Surplus [Abstract]

Dividend Restrictions and Statutory Surplus

13. Dividend Restrictions and Statutory Surplus

Under regulatory requirements at September 30, 2011, the amount of dividends that may be paid through the end of 2011 by our insurance and HMO subsidiaries without prior approval by regulatory authorities is approximately $372 million in the aggregate.  There are no such restrictions on distributions from Aetna to its shareholders.  In the third quarter of 2011, our insurance and HMO subsidiaries paid approximately $1.1 billion of dividends to the Company.

The combined statutory capital and surplus of our insurance and HMO subsidiaries was $6.5 billion and $6.2 billion at September 30, 2011 and December 31, 2010, respectively.

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Consolidated Statements of Income (Unaudited) (USD $) In Millions, except Per Share data	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Revenue:
Health care premiums	$ 6,776.7		$ 6,908.9		$ 20,260.7		$ 20,719.2
Other premiums	439.8		448.9		1,336.9		1,384.1
Fees and other revenue	946.6	[1]	853.2	[1]	2,742.7	[1]	2,626.0	[1]
Net investment income	233.6		248.2		727.5		777.1
Net realized capital gains	78.6		79.6		139.7		199.7
Total revenue	8,475.3		8,538.8		25,207.5		25,706.1
Benefits and expenses:
Health care costs	5,345.5	[2]	5,649.3	[2]	16,060.3	[2]	16,998.9	[2]
Current and future benefits	470.7		480.9		1,433.9		1,488.6
Operating expenses:
Selling expenses	269.1		304.8		827.0		928.8
General and administrative expenses	1,547.2		1,249.3		4,144.5		3,700.6
Total operating expenses	1,816.3		1,554.1		4,971.5		4,629.4
Interest expense	59.7		63.9		187.3		185.5
Amortization of other acquired intangible assets	31.7		23.4		83.6		72.0
Total benefits and expenses	7,723.9		7,771.6		22,736.6		23,374.4
Income before income taxes	751.4		767.2		2,470.9		2,331.7
Income taxes:
Current	324.6		103.4		888.6		558.3
Deferred	(63.6)		166.2		(30.8)		222.2
Total income taxes	261.0		269.6		857.8		780.5
Net income	$ 490.4		$ 497.6		$ 1,613.1		$ 1,551.2
Earnings per common share:
Basic	$ 1.33		$ 1.21		$ 4.28		$ 3.67
Diluted	$ 1.30		$ 1.19		$ 4.19		$ 3.61

[1] Fees and other revenue include administrative services contract member co-payments and plan sponsor reimbursements related to our mail order and specialty pharmacy operations of $16.4 million and $46.4 million (net of pharmaceutical and processing costs of $317.1 million and $938.0 million) for the three and nine months ended September 30, 2011, respectively, and $22.3 million and $60.5 million (net of pharmaceutical and processing costs of $360.3 million and $1.1 billion) for the three and nine months ended September 30, 2010, respectively.

[2] Health care costs have been reduced by Insured member co-payments related to our mail order and specialty pharmacy operations of $31.4 million and $101.0 million for the three and nine months ended September 30, 2011, respectively, and $36.2 million and $113.7 million for the three and nine months ended September 30, 2010, respectively.

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Discontinued Products (Tables)

9 Months Ended

Sep. 30, 2011

Discontinued Products [Abstract]

Activity in the Reserve for Anticipated Future Losses

The activity in the reserve for anticipated future losses on discontinued products for the nine months ended September 30, 2011 and 2010 was as follows (pretax):

(Millions)	2011		2010
Reserve, beginning of period	$	884.8	$	789.2
Operating income (loss)	4.7		(19.3		)
Net realized capital gains	19.3		84.2
Reserve, end of period	$	908.8	$	854.1

Assets and Liabilities Supporting Discontinued Products

Assets and liabilities supporting discontinued products at September 30, 2011 and December 31, 2010 were asfollows: ⁽¹⁾ 

(Millions)	2011		2010
Assets:
Debt and equity securities available for sale	$	2,613.1	$	2,611.9
Mortgage loans	455.5		498.8
Other investments	654.5		601.6
Total investments	3,723.1		3,712.3
Other assets	81.7		90.4
Collateral received under securities loan agreements	—		35.1
Current and deferred income taxes	23.4		20.7
Receivable from continuing products (2)	515.3		492.4
Total assets	$	4,343.5	$	4,350.9
Liabilities:
Future policy benefits	$	3,040.9	$	3,162.2
Policyholders' funds	8.3		10.2
Reserve for anticipated future losses on discontinued products	908.8		884.8
Collateral payable under securities loan agreements	—		35.1
Other liabilities (3)	385.5		258.6
Total liabilities	$	4,343.5	$	4,350.9

⁽¹⁾  Assets supporting the discontinued products are distinguished from assets supporting continuing products.

⁽²⁾  The receivable from continuing products is eliminated in consolidation.

⁽³⁾  Net unrealized capital gains on the available-for-sale debt securities are included in other liabilities and are not reflected in consolidated shareholders’ equity.

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Investments - Mortgage Loans (Details) (Commercial Real Estate [Member], USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Movement in Mortgage Loans on Real Estate [Roll Forward]
Mortgage Loans on Real Estate, New Mortgage Loans	$ 56.1	$ 37.9	$ 184.6	$ 53.2
Mortgage loans fully repaid	15.4	21.2	54.6	74.3
Mortgage Loans on Real Estate, Foreclosures	0	8.5	0	20.0
Mortgage Loans on Real Estate	1,605.8		1,605.8		1,509.8
Category 1 [Member]
Movement in Mortgage Loans on Real Estate [Roll Forward]
Mortgage Loans on Real Estate	104.5		104.5		99.4
Category 2 to 4 [Member]
Movement in Mortgage Loans on Real Estate [Roll Forward]
Mortgage Loans on Real Estate	1,374.7		1,374.7		1,301.5
Category 5 [Member]
Movement in Mortgage Loans on Real Estate [Roll Forward]
Mortgage Loans on Real Estate	91.3		91.3		86.1
Categories 6 and 7 [Member]
Movement in Mortgage Loans on Real Estate [Roll Forward]
Mortgage Loans on Real Estate	$ 35.3		$ 35.3		$ 22.8

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Financial Instruments Financial Instruments - Separate Accounts Unobservable Inputs (Details) (Fair Value, Measurements, Recurring [Member], Fair Value, Inputs, Level 3 [Member], USD $) In Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010		Sep. 30, 2011	Sep. 30, 2010
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 253.1	$ 305.1		$ 268.3	$ 483.5
Included in earnings	0.6	1.7		1.5	12.5
Purchases, sales and maturities		(5.5)			(159.4)
Transfers into (out of) Level 3	11.1	(44.0)		2.1	(81.6)
Ending balance	257.7	273.2		257.7	273.2
Total Separate Accounts [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance					168.7
Included in earnings					(38.6)
Purchases, sales and maturities					21.3
Transfers into (out of) Level 3					(77.5)	[1]
Ending balance		73.9			73.9
Real Estate Investment [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance					71.4
Included in earnings					5.2
Purchases, sales and maturities					0.2
Transfers into (out of) Level 3					(76.8)	[1]
Ending balance		0			0
Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	39.0	87.7		56.0	97.3
Included in earnings	0	(13.2)		(15.6)	(43.8)
Purchases, sales and maturities	(38.2)	3.1		(39.1)	21.1
Transfers into (out of) Level 3	(0.7)	(3.7)	[1]	(1.2)	(0.7)	[1]
Ending balance	$ 0.1	$ 73.9		$ 0.1	$ 73.9

[1] The transfers out of Level 3 for 2010 primarily represent real estate Separate Account assets that were transitioned out of our business in the second quarter of 2010.

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Segment Information - Reconciliation of Operating Earnings (Details) (USD $) In Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Reconciliation from Segment Totals to Consolidated [Abstract]
Segment Operating Earnings (Loss)	$ 528.4	[1]	$ 419.6	[1]	$ 1,611.4	[1]	$ 1,300.4	[1]
Voluntary early retirement expense, after tax	(89.1)	[2]	0	[2]	(89.1)	[2]	0	[2]
Litigation Related Insurance Proceeds	0	[2]	26.6	[2]	0	[2]	85.1	[2]
Net Realized Capital Gains Losses	51.1		51.4		90.8		165.7
Net income	490.4		497.6		1,613.1		1,551.2
Voluntary early retirement expense (pretax)	137.0				137.0
Litigation settlement, after tax			26.6				85.1
Litigation settlement, pretax			$ 41.0				$ 131.0

[1] Operating earnings (loss) excludes net realized capital gains or losses and the other items described in the reconciliation on page 30.

[2] In addition to net realized capital gains, the following items are excluded from operating earnings because we believe they neither relate to the ordinary course of our business nor reflect our underlying business performance:• In July 2011, we announced a voluntary early retirement program (the "Program"). In connection with the Program, we recorded a one-time charge of $89.1 million ($137.0 million pretax) during the three and nine months ended September 30, 2011.• Following a Pennsylvania Supreme Court ruling in June 2009, we recorded litigation-related insurance proceeds of $26.6 million ($41.0 million pretax) and $85.1 million ($131.0 million pretax) for the three and nine months ended September 30, 2010, respectively, from our liability insurers related to certain litigation we settled in 2003.

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Investments - Debt Securities by Maturity (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2011 years		Dec. 31, 2010
Available-for-sale Securities, Debt Maturities [Abstract]
Available-for-sale Securities, Fair Value Disclosure	$ 16,771.7	[1]	$ 16,961.6	[1]
Debt Securities [Member]
Available-for-sale Securities, Debt Maturities [Abstract]
Available-for-sale Securities, Fair Value Disclosure	16,734.5		16,922.3
Available-for-sale Securities With Established Maturities [Member]
Available-for-sale Securities, Debt Maturities [Abstract]
Due To Mature Less Than One Year	694.5
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value	3,018.1
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value	5,213.8
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	5,194.7
Residential Mortgage Backed Securities [Member]
Available-for-sale Securities, Debt Maturities [Abstract]
Available-for-sale Securities, Fair Value Disclosure	863.0		1,140.0
Weighted Average Duration Of Securities	1.9
Commercial Mortgage Backed Securities [Member]
Available-for-sale Securities, Debt Maturities [Abstract]
Available-for-sale Securities, Fair Value Disclosure	1,335.2		1,312.2
Weighted Average Duration Of Securities	3.7
Other Asset-Backed Securities [Member]
Available-for-sale Securities, Debt Maturities [Abstract]
Available-for-sale Securities, Fair Value Disclosure	$ 415.2		$ 463.9
Weighted Average Duration Of Securities	3.4

[1] Investment risks associated with our experience-rated and discontinued products generally do not impact our operating results (refer to Note 17 beginning on page 30 for additional information on our accounting for discontinued products). At September 30, 2011, debt and equity securities with a fair value of $4.1 billion, gross unrealized capital gains of $483.4 million and gross unrealized capital losses of $55.7 million and, at December 31, 2010, debt and equity securities with a fair value of $4.1 billion, gross unrealized capital gains of $339.5 million and gross unrealized capital losses of $38.1 million were included in total debt and equity securities, but support our experience-rated and discontinued products. Changes in net unrealized capital gains (losses) on these securities are not reflected in accumulated other comprehensive income

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Investments - Unrealized Loss Position (Details) (USD $) In Millions	Sep. 30, 2011		Dec. 31, 2010
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 2,071.9		$ 2,313.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	95.2		76.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	313.4		541.1
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	38.1		49.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	2,385.3	[1]	2,854.4	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	133.3	[1]	126.2	[1]
Debt Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	2,056.0		2,312.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	87.6		76.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	302.7		531.6
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	37.7		48.2
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	2,358.7	[1]	2,844.4	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	125.3	[1]	124.6	[1]
Debt Securities [Member] | Supporting Discontinued And Experience Rated Products [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	585.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	47.7
Debt Securities [Member] | Supporting Remaining Products [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,772.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	77.6
US Government Agencies Debt Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	50.9		8.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	0.1		0.2
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	15.1		19.8
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0.3		0.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	66.0	[1]	28.2	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	0.4	[1]	0.6	[1]
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	90.8		964.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	1.0		37.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	93.4		82.7
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	3.9		9.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	184.2	[1]	1,047.6	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	4.9	[1]	46.9	[1]
Domestic Corporate Debt Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	947.2		665.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	40.7		17.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	74.1		210.2
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	2.9		4.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,021.3	[1]	876.0	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	43.6	[1]	21.9	[1]
Foreign Corporate Debt Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	659.0		375.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	34.8		14.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	34.4		34.6
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	8.3		6.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	693.4	[1]	410.5	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	43.1	[1]	21.2	[1]
Residential Mortgage Backed Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0		103.7
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	0		2.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	3.1		6.6
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0.1		0.2
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	3.1	[1]	110.3	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	0.1	[1]	2.8	[1]
Commercial Mortgage Backed Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	263.9		103.7
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	9.0		2.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	43.2		78.5
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	5.3		11.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	307.1	[1]	182.2	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	14.3	[1]	13.7	[1]
Other Asset-Backed Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	5.7		85.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	0.3		2.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	3.9		4.9
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	3.8		2.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	9.6	[1]	90.8	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	4.1	[1]	4.8	[1]
Redeemable Preferred Stock [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	38.5		4.5
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	1.7		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	35.5		94.3
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	13.1		12.7
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	74.0	[1]	98.8	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	14.8	[1]	12.7	[1]
Equity Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	15.9		0.5
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	7.6		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	10.7		9.5
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0.4		1.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	26.6	[1]	10.0	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	8.0	[1]	1.6	[1]
Supporting Discontinued And Experience Rated Products [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	612.0		650.5
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	$ 55.7		$ 38.1

[1] At September 30, 2011 and December 31, 2010, debt and equity securities in an unrealized capital loss position of $55.7 million and $38.1 million, respectively, and with related fair value of $612.0 million and $650.5 million, respectively, related to experience-rated and discontinued products

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Financial Instruments - Unobservable Input Reconciliation (Details) (Fair Value, Measurements, Recurring [Member], Fair Value, Inputs, Level 3 [Member], USD $) In Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 253.1		$ 305.1		$ 268.3		$ 483.5
Included in earnings	0.6		1.7		1.5		12.5
Included in other comprehensive income	(2.7)		13.3		0		20.3
Other	(6.7)	[1]	2.6	[1]	(10.9)	[1]	(2.1)	[1]
Purchases	24.6				55.6
Sales	(6.6)				(26.7)
Settlements	(15.7)				(32.2)
Purchases, sales and maturities			(5.5)				(159.4)
Transfers into (out of) Level 3	11.1		(44.0)		2.1		(81.6)
Ending balance	257.7		273.2		257.7		273.2
Fair Value, Assets Measured on Recurring Basis, Gain (Loss) Included in Earnings [Abstract]
Amount of Level 3 net unrealized losses included in net income	0		(0.4)		(0.2)		(0.4)
Domestic Corporate Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance			85.1				75.3
Included in earnings			(0.1)				(0.4)
Included in other comprehensive income			(0.9)				(1.7)
Other			0	[1]			(0.2)	[1]
Purchases, sales and maturities			3.3				(11.3)
Transfers into (out of) Level 3			(27.1)				(1.4)
Ending balance			60.3				60.3
Fair Value, Assets Measured on Recurring Basis, Gain (Loss) Included in Earnings [Abstract]
Amount of Level 3 net unrealized losses included in net income			0				0
Foreign Corporate Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	50.1		50.9		54.9		199.0
Included in earnings	0.1		1.5		1.1		8.2
Included in other comprehensive income	(1.5)		0.4		(2.0)		(3.2)
Other	(1.1)	[1]	0.8	[1]	(0.4)	[1]	1.8	[1]
Purchases	7.2				27.4
Sales	0				(16.4)
Settlements	0				(0.8)
Purchases, sales and maturities			(7.0)				(92.0)
Transfers into (out of) Level 3	0		(4.8)		(9.0)	[2]	(72.0)
Ending balance	54.8		41.8		54.8		41.8
Fair Value, Assets Measured on Recurring Basis, Gain (Loss) Included in Earnings [Abstract]
Amount of Level 3 net unrealized losses included in net income	0		0		0		0
Commercial Mortgage Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	39.8				36.9
Included in earnings	1.1				2.6
Included in other comprehensive income	(2.2)				0.8
Other	0	[1]			0	[1]
Purchases	0				0
Sales	0				0
Settlements	(10.0)				(11.6)
Transfers into (out of) Level 3	0				0
Ending balance	28.7				28.7
Fair Value, Assets Measured on Recurring Basis, Gain (Loss) Included in Earnings [Abstract]
Amount of Level 3 net unrealized losses included in net income	0				0
Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	33.2				37.9
Included in earnings	0				0
Included in other comprehensive income	0				0
Other	(1.8)	[1]			(6.7)	[1]
Purchases	5.3				5.5
Sales	(0.3)				(0.3)
Settlements	0				0
Transfers into (out of) Level 3	0				0
Ending balance	36.4				36.4
Fair Value, Assets Measured on Recurring Basis, Gain (Loss) Included in Earnings [Abstract]
Amount of Level 3 net unrealized losses included in net income	0				0
Other Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	130.0		169.1		138.6		209.2
Included in earnings	(0.6)		0.3		(2.2)		4.7
Included in other comprehensive income	1.0		13.8		1.2		25.2
Other	(3.8)	[1]	1.8	[1]	(3.8)	[1]	(3.7)	[1]
Purchases	12.1				22.7
Sales	(6.3)				(10.0)
Settlements	(5.7)				(19.8)
Purchases, sales and maturities			(1.8)				(56.1)
Transfers into (out of) Level 3	11.1	[2]	(12.1)		11.1	[2]	(8.2)
Ending balance	137.8		171.1		137.8		171.1
Fair Value, Assets Measured on Recurring Basis, Gain (Loss) Included in Earnings [Abstract]
Amount of Level 3 net unrealized losses included in net income	$ 0		$ (0.4)		$ (0.2)		$ (0.4)

[1] Reflects realized and unrealized capital gains and losses on investments supporting our experience-rated and discontinued products, which do not impact our operating results.

[2] Amounts represent gross transfers (out of) into Level 3.

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Acquisitions (Details) (USD $) In Millions	9 Months Ended
	Sep. 30, 2011 PayFlex [Member] Acquisition [Member]	Sep. 30, 2011 Genworth Financial Inc Medicare Supplement Business [Member] Acquisition [Member]	Jun. 30, 2011 Prodigy Health Group [Member]	Jan. 31, 2011 Medicity Inc [Member]
Business Acquisition [Line Items]
Acquisition price			$ 600	$ 490
Goodwill related to the acquisition			445	394
Amount of acquired goodwill that will be tax deductible			52
Subsequent Event - Acquisition	$ 190	$ 260