Summary of Stock Option and Restricted Stock Activity (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock Options Shares
Beginning balance	15,869,417	17,142,500	17,661,216
Granted	859,390	813,265	1,192,974
Exercised/vested	(973,048)	(20,000)	0
Cancelled/expired/forfeited	(2,444,107)	(2,066,348)	(1,711,690)
Ending balance	13,311,652	15,869,417	17,142,500	17,661,216
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	11,017,763
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	$ 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	$ 21.67	$ 19.98	$ 22.69
Share Based Compensation Shares Authorized Under Stock Option Plans Grants In Period Exercise Price Range Upper Range Limit	$ 23.68	$ 32.27	$ 27.79
Share Based Compensation Shares Authorized Under Stock Option Plans Vested In Period Exercise Price Range Lower Range Limit	$ 9.06	$ 0	$ 0
Share Based Compensation Shares Authorized Under Stock Option Plans Vested In Period Exercise Price Range Upper Range Limit	$ 22.69	$ 9.06	$ 0
Share Based Compensation Shares Authorized Under Stock Option Plans Forfeitures And Expirations In Period Exercise Price Range Lower Range Limit	$ 9.06	$ 9.06	$ 9.06
Share Based Compensation Shares Authorized Under Stock Option Plans Forfeitures And Expirations In Period Exercise Price Range Upper Range Limit	$ 85.06	$ 140.40	$ 140.14
Stock Options Weighted Average Exercise Price
Beginning balance	$ 48.53	$ 51.17	$ 53.17
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 21.92	$ 29.70	$ 23.64
Exercised/vested	$ 9.90	$ 9.06	$ 0.00
Cancelled/expired/forfeited	$ 45.73	$ 63.40	$ 52.62
Ending balance	$ 50.15	$ 48.53	$ 51.17	$ 53.17
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 55.45
Restricted Stock Weighted Average Grant Price
Fair Value of Restricted Stock Units Per Unit	21.67
Balance of Restricted Stock Units	$ 12
Restricted Stock [Member]
Restricted Stock Shares
Beginning balance	4,622,167	4,620,809	4,770,172
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	1,737,202	1,400,305	1,355,075
Exercised/vested	(2,148,764)	(1,085,252)	(1,266,267)
Cancelled/expired/forfeited	(524,284)	(313,695)	(238,171)
Ending balance	3,686,321	4,622,167	4,620,809
Restricted Stock Deferred Compensation
Beginning balance	48	43	59
Granted	38	44	33
Cancelled/expired/forfeited	(8)	(7)	(7)
Amortization of restricted stock compensation	(30)	(32)	(42)
Ending balance	$ 48	$ 48	$ 43
Restricted Stock Weighted Average Grant Price
Beginning balance	$ 21.46	$ 25.32	$ 37.02
Granted	$ 21.97	$ 31.27	$ 24.01
Exercised/vested	$ 14.62	$ 50.37	$ 67.27
Cancelled/expired/forfeited	$ 19.91	$ 22.07	$ 29.22
Ending balance	$ 25.56	$ 21.46	$ 25.32
Restricted Stock Units (RSUs) [Member]
Restricted Stock Shares
Beginning balance	405,475	65,190	66,420
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	1,717,148	344,590	0
Exercised/vested	(109,149)	0	0
Cancelled/expired/forfeited	(82,828)	(4,305)	(1,230)
Ending balance	1,930,646	405,475	65,190
Restricted Stock Weighted Average Grant Price
Beginning balance	$ 35.98	$ 26.96	$ 26.96
Granted	$ 22.65	$ 37.57	$ 0.00
Exercised/vested	$ 27.73	$ 0.00	$ 0.00
Cancelled/expired/forfeited	$ 22.79	$ 26.96	$ 26.96
Ending balance	$ 25.16	$ 35.98	$ 26.96

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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 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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