Employee Benefit Plans, Share Based Compensation, Equity Instruments Other Than Options (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		3 Months Ended							3 Months Ended
	Mar. 31, 2012 Y	Dec. 31, 2011	Mar. 31, 2012 Restricted Stock Units (RSUs) [Member]	Mar. 31, 2012 Restricted Stock Units (RSUs) [Member] Minimum [Member] Y	Mar. 31, 2012 Restricted Stock Units (RSUs) [Member] Maximum [Member] Y	Mar. 31, 2012 Performance Share Awards [Member]		Mar. 31, 2012 Restricted Stock Units and Performance Share Awards [Member]	Dec. 31, 2011 Restricted Stock Units and Performance Share Awards [Member]	Mar. 31, 2012 Employee Stock Purchase Plan 2008 [Member]	Mar. 31, 2011 Employee Stock Purchase Plan 2008 [Member]	Mar. 31, 2012 Employee Stock Purchase Plan [Member] M
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Units Vest From Grant Date In Years				3	4
Share-Based Compensation Arrangement Vesting Period PSA in Years	3
Restricted Stock Units And Performance Share Awards Activities
Beginning Balance, Number of Shares								24,700,000	19,600,000
Beginning Balance, Weighted Average Grant-Date Fair Value								$ 28.54	$ 30.27
Awards Granted, Number of Shares			6,500,000			2,200,000	[1]
Awards Granted, Weighted Average Grant-Date Fair Value			$ 22.04			$ 23.22
share-based compensation arrangement by share based payment award, assumed awards			200,000
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, Number of Shares			(1,600,000)			(1,400,000)
Awards Vested, Weighted Average Grant-Date Fair Value			$ 27.55			$ 15.63
Awards Canceled, Number of Shares			(400,000)			(400,000)
Awards Canceled, Weighted Average Grant-Date Fair Value			$ 30.20			$ 31.73
Ending Balance, Number of Shares								24,700,000	19,600,000
Ending Balance, Weighted Average Grant-Date Fair Value								$ 28.54	$ 30.27
RSUs and PSAs, Weighted Average Remaining Contractual Term at Period End	1.6
RSUs and PSAs, Aggregate Intrinsic Value at Period End	$ 558.3
Vested and Expected-to-Vest RSUs and PSAs, Number of Shares at Period End	28,800,000
Vested and Expected-to-Vest RSUs and PSAs, Weighted Average Grant-Date Fair Value at Period End	$ 0.00
Vested and Expected-to-Vest RSUs and PSAs, Weighted Average Remaining Contractual Term at Period End	1.4
Vested and Expected-to-Vest RSUs and PSAs, Aggregate Intrinsic Value at Period End	$ 456.5
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 based compensation incremental Board approved offering period in months												6
Stock Issued During Period, Shares, Employee Stock Purchase Plans										1,700,000	1,000,000
Average Price of Common Stock, Per Share										$ 17.79	$ 23.89
Common Stock, Shares, Issued	529,177,000	526,409,000										7,700,000
Common Stock, Capital Shares Reserved for Future Issuance	93,000,000											4,300,000

[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.