Summary of Stock Option and Restricted Stock Activity (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Options Shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	5,218,258	7,727,757	10,929,371	13,311,652
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0	0	552,998
Share Based Compensation Arrangement by Share Based Payment Award, Options, Vested in Period	(687,832)	(426,889)	(712,981)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period	(1,821,667)	(2,774,725)	(2,222,298)
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options	5,033,948
Stock Options Price Range
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 9.06	$ 9.06	$ 9.06	$ 9.06
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	85.34	150.45	150.45	150.45
Share Based Compensation Shares Authorized Under Stock Option Plans Grants in Period Exercise Price Range Lower Range Limit	0	0	27.41
Share Based Compensation Shares Authorized Under Stock Option Plans Grants in Period Exercise Price Range Upper Range Limit	0	0	27.41
Share Based Compensation Shares Authorized Under Stock Option Plans Vested in Period Exercise Price Range Lower Range Limit	9.06	9.06	9.06
Share Based Compensation Shares Authorized Under Stock Option Plans Vested in Period Exercise Price Range Upper Range Limit	32.27	32.27	27.79
Share Based Compensation Shares Authorized Under Stock Option Plans Forfeitures and Expirations in Period Exercise Price Range Lower Range Limit	23.70	23.70	21.67
Share Based Compensation Shares Authorized Under Stock Option Plans Forfeitures and Expirations in Period Exercise Price Range Upper Range Limit	150.45	149.81	118.18
Stock Options Weighted Average Exercise Price
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	36.75	43.84	49.86	$ 50.15
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	0.00	0.00	27.41
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	20.38	20.86	16.94
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price	73.01	$ 71.10	$ 56.55
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 37.09
Restricted Stock Shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				574,257
Restricted Stock [Member]
Restricted Stock Shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	1,334,075	2,929,859	3,983,538	3,686,321
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	20,412	21,427	1,314,277
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(1,510,045)	(957,308)	(821,636)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(106,151)	(117,798)	(195,424)
Restricted Stock Deferred Compensation
Deferred Compensation Arrangement with Individual, Recorded Liability	$ 2	$ 21	$ 50	$ 48
Deferred Compensation Arrangement, Grants in Period	1	0	39
Deferred Compensation Arrangement, Vested	0	0	0
Deferred Compensation Arrangement, Forfeitures and Expirations in Period	(4)	(2)	(5)
Deferred Compensation Arrangement, Amortization	$ (16)	$ (27)	$ (32)
Restricted Stock Weighted Average Grant Price
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 30.44	$ 26.45	$ 27.04	$ 25.56
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	41.15	39.20	29.58
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	22.86	29.31	25.95
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 29.95	$ 25.60	$ 27.41
Restricted Stock Units (RSUs) [Member]
Restricted Stock Shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	4,318,840	3,689,264	2,496,178	1,930,646
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	1,670,587	1,590,075	593,093
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(883,621)	(338,196)	(41,790)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(157,390)	(58,793)	(14,229)
Restricted Stock Weighted Average Grant Price
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 35.44	$ 31.15	$ 26.69	$ 25.16
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	40.54	36.67	24.65
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	26.39	32.80	28.73
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 39.19	$ 37.73	$ 20.54

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The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit.

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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 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 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.

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

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Number of options outstanding, including both vested and non-vested options.

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

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

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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