Employee Benefit Plans, Share Based Compensation, Equity Instruments Other Than Options (Details) (USD $) In Millions, except Share data, unless otherwise specified			3 Months Ended		9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Employee Stock Purchase Plan 2008 [Member]	Sep. 30, 2011 Employee Stock Purchase Plan 2008 [Member]	Sep. 30, 2012 Employee Stock Purchase Plan 2008 [Member]	Sep. 30, 2011 Employee Stock Purchase Plan 2008 [Member]	Sep. 30, 2012 Restricted Stock Units (RSUs) [Member]	Sep. 30, 2012 Restricted Stock Units (RSUs) [Member] Minimum [Member]	Sep. 30, 2012 Restricted Stock Units (RSUs) [Member] Maximum [Member]	Sep. 30, 2012 Performance Shares [Member]		Sep. 30, 2012 Restricted Stock Units and Performance Share Awards [Member]	Sep. 30, 2012 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period								3 years	4 years	3 years
Restricted Stock Units And Performance Share Awards Activities
Beginning Balance, Number of Shares												19,600,000
Awards Granted, Number of Shares							7,800,000			2,200,000	[1]
Share-based compensation arrangement by share based payment award, assumed awards							200,000
Awards Vested, Number of Shares							(2,200,000)			(1,900,000)
Awards Canceled, Number of Shares							(1,500,000)			(900,000)
Ending Balance, Number of Shares												23,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Beginning Balance, Weighted Average Grant-Date Fair Value												$ 30.27
Awards Granted, Weighted Average Grant-Date Fair Value							$ 20.83			$ 23.07
Share-based Compensation Arrangement by Share-based Payment Award, Equity INstruments Other than Options, Assumed Awards, Weighted AVerage Grant Date Fair Value							$ 22.47
Awards Vested, Weighted Average Grant-Date Fair Value							$ 28.10			$ 18.02
Awards Canceled, Weighted Average Grant-Date Fair Value							$ 28.66			$ 32.50
Ending Balance, Weighted Average Grant-Date Fair Value												$ 27.77
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms												1 year 5 months
RSUs and PSAs, Aggregate Intrinsic Value at Period End												$ 399.0
Vested and Expected-to-Vest RSUs and PSAs, Number of Shares at Period End												18,800,000
Vested and Expected-to-Vest RSUs and PSAs, Weighted Average Grant-Date Fair Value at Period End												$ 27.56
Vested and Expected-to-Vest RSUs and PSAs, Weighted Average Remaining Contractual Term at Period End												1 year 4 months
Vested and Expected-to-Vest RSUs and PSAs, Aggregate Intrinsic Value at Period End												$ 322.4
Aggregate Number Of Shares Subject to PSAs Granted										900,000
Minimum shares to be Issued on achievement of performance goals in respect of PSAs										0
Maximum shares to be issued on achievement of performance goals in respect of PSAs										2,200,000
Employee Stock Purchase Plan
Stock Issued During Period, Shares, Employee Stock Purchase Plans			1,900,000	1,400,000	3,600,000	2,400,000
Average Price of Common Stock, Per Share			$ 14.90	$ 19.88	$ 16.26	$ 21.53
Common Stock, Shares, Issued	515,332,000	526,409,000											9,500,000
Common Stock, Capital Shares Reserved for Future Issuance	118,700,000												9,500,000

[1] The number of shares subject to PSAs granted represents the aggregate maximum number of shares that may be issued pursuant to the award over its full term. The aggregate number of shares subject to these PSAs that would be issued if performance goals determined by the Compensation Committee are achieved at target is 0.9 million shares. Depending on achievement of such performance goals, the range of shares that could be issued under these awards is 0 to 2.2 million shares.