Stock Based Awards and Other Equity Instruments - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Common stock reserved for new stock-based awards, shares	7,000,000
One-time expense		$ 11,000,000
Total stock-based compensation	64,596,000	63,847,000	52,507,000
Stock-based compensation tax benefit	9,000,000	12,000,000	15,000,000
Cash received from stock-based award exercises	50,000,000	34,000,000
Income tax benefit associated with stock-based awards	64,000,000	21,000,000	23,000,000
Unrecognized stock-based compensation expense related to unvested stock-based awards	100,000,000
Unvested stock-based awards, which is expected to be recognized in expense weighted-average period (in years)	2 years 5 months 19 days
Privately held warrants exercised	32,000,000
Common stock issued due to exercise of warrants	8,000,000
Weighted average exercise price of warrants	23.91
Total proceeds from exercise of warrants	191,000,000
Stock Option
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock price, as of year end	61.44
Total intrinsic value of stock options exercised, value	109,000,000	30,000,000	41,000,000
Restricted Stock Units (RSUs)
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restricted stock unit vested years	5 years
Total fair value of shares vested and released, value	$ 62,000,000	$ 37,000,000	$ 43,000,000
Restricted Stock Units (RSUs) | Chief Executive Officer
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Performance-based restricted stock units outstanding		400,000