Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities
Net income	$ 1,147us-gaap_NetIncomeLoss	$ 1,231us-gaap_NetIncomeLoss	$ 1,222us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	449us-gaap_DepreciationAndAmortization	426us-gaap_DepreciationAndAmortization	338us-gaap_DepreciationAndAmortization
Stock-based compensation	98us-gaap_ShareBasedCompensation	92us-gaap_ShareBasedCompensation	82us-gaap_ShareBasedCompensation
Net realized capital gains	(20)	(22)	(33)
(Benefit) provision for deferred income taxes	(64)	42	(80)
Provision for doubtful accounts	32	37	26
Changes in operating assets and liabilities, net of effect of businesses acquired and dispositions:
Receivables	(264)us-gaap_IncreaseDecreaseInReceivables	(251)us-gaap_IncreaseDecreaseInReceivables	326us-gaap_IncreaseDecreaseInReceivables
Other assets	(952)	(330)	(253)
Benefits payable	582	109	(41)
Other liabilities	413	313	300
Unearned revenues	155	(24)	(43)
Other	42	93	79
Net cash provided by operating activities	1,618	1,716	1,923
Cash flows from investing activities
Acquisitions, net of cash acquired	(18)	(187)	(1,235)
Proceeds from sale of business	72	34	0
Purchases of property and equipment	(528)	(441)	(410)
Proceeds from sales of property and equipment	0	4	0
Purchases of investment securities	(2,883)	(3,261)	(3,221)
Maturities of investment securities	885	1,077	1,497
Proceeds from sales of investment securities	2,409	1,592	1,404
Net cash used in investing activities	(63)	(1,182)	(1,965)
Cash flows from financing activities
Receipts (withdrawals) from contract deposits, net	(919)us-gaap_IncreaseDecreaseInOtherDeposits	(150)us-gaap_IncreaseDecreaseInOtherDeposits	(397)us-gaap_IncreaseDecreaseInOtherDeposits
Proceeds from issuance of senior notes, net	1,733	0	990
Repayment of long-term debt	(500)us-gaap_RepaymentsOfLongTermDebt	0us-gaap_RepaymentsOfLongTermDebt	(36)us-gaap_RepaymentsOfLongTermDebt
Common stock repurchases	(872)	(531)	(518)
Dividends paid	(172)us-gaap_PaymentsOfDividends	(168)us-gaap_PaymentsOfDividends	(165)us-gaap_PaymentsOfDividends
Excess tax benefit from stock-based compensation	12	8	22
Change in book overdraft	(69)	79	18
Proceeds from stock option exercises and other, net	29	60	57
Net cash used in financing activities	(758)	(702)	(29)
Increase (decrease) in cash and cash equivalents	797	(168)	(71)
Cash and cash equivalents at beginning of year	1,138	1,306	1,377
Cash and cash equivalents at end of year	1,935	1,138	1,306
Supplemental cash flow disclosures:
Interest payments	143us-gaap_InterestPaid	146us-gaap_InterestPaid	110us-gaap_InterestPaid
Income tax payments, net	1,030us-gaap_IncomeTaxesPaidNet	734us-gaap_IncomeTaxesPaidNet	745us-gaap_IncomeTaxesPaidNet
Details of businesses acquired in purchase transactions:
Fair value of assets acquired, net of cash acquired	18us-gaap_FairValueOfAssetsAcquired	196us-gaap_FairValueOfAssetsAcquired	1,535us-gaap_FairValueOfAssetsAcquired
Less: Fair value of liabilities assumed	0us-gaap_LiabilitiesAssumed1	(9)us-gaap_LiabilitiesAssumed1	(300)us-gaap_LiabilitiesAssumed1
Cash paid for acquired businesses, net of cash acquired	$ 18	$ 187	$ 1,235

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The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

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-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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The cash inflow associated with the sale of debt securities classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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-Section 45

-Paragraph 12

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-Section 45

-Paragraph 14

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to costs and expenses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

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