Summary of Stock Option and Restricted Stock Activity (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	552,998	859,390	813,265
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 9.06	$ 9.06	$ 9.06	$ 9.06
Stock Options Shares
Beginning balance	13,311,652	15,869,417	17,142,500
Exercised/vested	(712,981)	(973,048)	(20,000)
Cancelled/expired/forfeited	(2,222,298)	(2,444,107)	(2,066,348)
Ending balance	10,929,371	13,311,652	15,869,417	17,142,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	9,351,182
Stock Options Weighted Average Exercise Price
Beginning balance	$ 50.15	$ 48.53	$ 51.17
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 27.41	$ 21.92	$ 29.70
Cancelled/expired/forfeited	$ 56.55	$ 45.73	$ 63.40
Ending balance	$ 49.86	$ 50.15	$ 48.53	$ 51.17
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 53.89
Restricted Stock Shares
Beginning balance	3,686,321	4,622,167	4,620,809
Ending balance	3,983,538	3,686,321	4,622,167	4,620,809
Restricted Stock Deferred Compensation
Beginning balance	$ 48	$ 48	$ 43
Ending balance	50	48	48	43
Restricted Stock Weighted Average Grant Price
Beginning balance	$ 25.56	$ 21.46	$ 25.32
Ending balance	$ 27.04	$ 25.56	$ 21.46	$ 25.32
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	$ 16.94	$ 9.90	$ 9.06
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 150.45	$ 150.45	$ 150.45	$ 150.45
Share Based Compensation Shares Authorized Under Stock Option Plans Grants in Period Exercise Price Range Lower Range Limit	$ 27.41	$ 21.67	$ 19.98
Share Based Compensation Shares Authorized Under Stock Option Plans Grants in Period Exercise Price Range Upper Range Limit	$ 27.41	$ 23.68	$ 32.27
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	$ 27.79	$ 22.69	$ 9.06
Share Based Compensation Shares Authorized Under Stock Option Plans Forfeitures and Expirations in Period Exercise Price Range Lower Range Limit	$ 21.67	$ 9.06	$ 9.06
Share Based Compensation Shares Authorized Under Stock Option Plans Forfeitures and Expirations in Period Exercise Price Range Upper Range Limit	$ 118.18	$ 85.06	$ 140.40
Restricted Stock [Member]
Restricted Stock Shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	1,314,277	1,737,202	1,400,305
Exercised/vested	(821,636)	(2,148,764)	(1,085,252)
Cancelled/expired/forfeited	(195,424)	(524,284)	(313,695)
Restricted Stock Deferred Compensation
Granted	39	38	44
Cancelled/expired/forfeited	(5)	(8)	(7)
Amortization of restricted stock compensation	(32)	(30)	(32)
Restricted Stock Weighted Average Grant Price
Granted	$ 29.58	$ 21.97	$ 31.27
Exercised/vested	$ 25.95	$ 14.62	$ 50.37
Cancelled/expired/forfeited	$ 27.41	$ 19.91	$ 22.07
Deferred Compensation Arrangement, Vested	$ 0	$ 0	$ 0
Restricted Stock Units (RSUs) [Member]
Restricted Stock Shares
Beginning balance	1,930,646	405,475	65,190
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	593,093	1,717,148	344,590
Exercised/vested	(41,790)	(109,149)	0
Cancelled/expired/forfeited	(14,229)	(82,828)	(4,305)
Ending balance	2,496,178	1,930,646	405,475
Restricted Stock Weighted Average Grant Price
Beginning balance	$ 25.16	$ 35.98	$ 26.96
Granted	$ 24.65	$ 22.65	$ 37.57
Exercised/vested	$ 28.73	$ 27.73	$ 0.00
Cancelled/expired/forfeited	$ 20.54	$ 22.79	$ 26.96
Ending balance	$ 26.69	$ 25.16	$ 35.98

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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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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 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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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 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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