Employee Incentive Plans (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Incentive Plans [Abstract]
Compensation costs	$ 88	$ 98	$ 61
Tax benefits	25	26	14
Number of shares of common stock available for award	13,200,000	8,400,000	11,700,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding - January 1	8,951,000	9,581,000	12,093,000
Options Granted	1,890,000	3,446,000	1,546,000
Options Exercised	(3,107,000)	(3,740,000)	(3,480,000)
Options Expired or canceled	(384,000)	(336,000)	(578,000)
Options outstanding - December 31	7,350,000	8,951,000	9,581,000
Options Exercisable - Number (in thousands)	4,217,000	5,731,000	6,147,000
Share Based Compensation Arrangement By Share Based Payment Award, Options Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted Average Exercise Price - Options Outstanding - January 1	$ 36.29	$ 33.92	$ 31.10
Weighted Average Exercise Price - Options Granted	$ 58.84	$ 28.29	$ 42.36
Weighted Average Exercise Price - Options Exercised	$ 34.99	$ 22.72	$ 27.93
Weighted Average Exercise Price - Options Expired or canceled	$ 43.86	$ 37.85	$ 33.61
Weighted Average Exercise Price - Options Outstanding - December 31	$ 42.24	$ 36.29	$ 33.92
Options Exercisable - Weighted Average Exercise Price	$ 35.84	$ 34.93	$ 34.94
Information For Stock Options Exercised Details [Abstract]
Intrinsic value of options exercised	105	95	53
Cash received for options exercised	109	85	97
Excess tax benefits realized from options exercised	23	15	10
Information for Outstanding Common Stock Options [Abstract]
Options Outstanding - Number (in thousands)	7,350,000	8,951,000	9,581,000
Options Outstanding - Total intrinsic value	333
Options Outstanding - Weighted Average Exercise Price	$ 42.24	$ 36.29	$ 33.92
Options Outstanding - Weighted average remaining contractual life	6 years 6 months
Options Exercisable - Number (in thousands)	4,217,000	5,731,000	6,147,000
Options Exercisable - Total Intrinsic Value	218
Options Exercisable - Weighted Average Exercise Price	$ 35.84	$ 34.93	$ 34.94
Options Exercisable - Weighted Average Remaining Contractual Life	5 years
Assumptions For Fair Value of Options Granted Details [Abstract]
Dividend Yield	0.10%	0.10%	0.10%
Expected Volatility	40.00%	40.00%	40.00%
Risk-free Interest Rate	0.70%	0.80%	1.70%
Expected Option Life	4 years 6 months	4 years 6 months	4 years
Stock Options [Member]
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Compensation expense related to non-vested share-based awards	25
Period in which compensation expense will be recognized	2 years
Stock Options [Member] \| Minimum [Member]
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Award vesting period	1 year
Stock Options [Member] \| Maximum [Member]
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Award vesting period	5 years
Stock options excluding HealthSpring rollover options [Member]
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Weighted average fair value of options granted under employee incentive plans	$ 19.81	$ 14.99	$ 13.96
Stock options excluding HealthSpring rollover options [Member] \| Maximum [Member]
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Award expiration period	10 years
Remaining maturity of traded options	1 year
Restricted Stock Grants And Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Nonvested, Roll Forward
Outstanding - January 1	4,064,000	4,246,000	4,306,000
Awarded	525,000	1,563,000	945,000
Vested	(1,480,000)	(1,485,000)	(564,000)
Forfeited	(265,000)	(260,000)	(441,000)
Outstanding - December 31	2,844,000	4,064,000	4,246,000
Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding - January 1	$ 35.00	$ 28.88	$ 27.70
Awarded	$ 59.36	$ 44.37	$ 42.62
Vested	$ 30.24	$ 27.60	$ 42.79
Forfeited	$ 39.46	$ 33.61	$ 28.99
Outstanding - December 31	$ 41.56	$ 35.00	$ 28.88
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Fair value of vested equity-based awards	94	66	24
Number of employees holding share based payment awards at the reporting date.	3,200
Compensation expense related to non-vested share-based awards	58
Period in which compensation expense will be recognized	3 years
Restricted Stock Grants And Units [Member] \| Minimum [Member]
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Award vesting period	2 years
Restricted Stock Grants And Units [Member] \| Maximum [Member]
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Award vesting period	5 years
Strategic Performance Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Nonvested, Roll Forward
Outstanding - January 1	1,600,000	834,000	430,000
Awarded	616,000	842,000	529,000
Vested	(448,000)	0	0
Forfeited	(196,000)	(76,000)	(125,000)
Outstanding - December 31	1,572,000	1,600,000	834,000
Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding - January 1	$ 41.92	$ 39.45	$ 34.73
Awarded	$ 59.84	$ 44.49	$ 42.92
Vested	$ 36.88	$ 0	$ 0
Forfeited	$ 47.52	$ 43.39	$ 37.92
Outstanding - December 31	$ 49.67	$ 41.92	$ 39.45
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Performance period for strategic performance shares	3 years
Fair value of vested equity-based awards	42	0	0
Strategic Performance Shares Subject to Market Conditions	50.00%
Strategic Performance Shares Subject to Performance Conditions	50.00%
Number of employees holding share based payment awards at the reporting date.	1,100
Compensation expense related to non-vested share-based awards	$ 33
Period in which compensation expense will be recognized	2 years

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Number of employees holding share based payment awards at the reporting date.

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Percent of executive strategic performance shares that are subject to a market condition - total shareholder return relative to industry peer companies

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The period of time which a traded option of the reporting entity might be outstanding. The volatility of traded options is not used as a component of the expectedvolatility of outstanding share based compensation option awards as the term of these options does not correlate to the expected term of share-based option awards.

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The period of time over which performance is measured to determine achievement for the performance awards.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

+ References

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

+ References

No definition available.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph c(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)(1)

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

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding.

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- Definition

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

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

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-Publisher FASB

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

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No definition available.

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Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

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- Definition

Number of share options (or share units) exercised during the current period.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Publisher SEC

-Name Regulation S-X (SX)

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-Section 02

-Paragraph 29, 30

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