Employee Benefit Plans, Share Based Compensation, Equity Instruments Other Than Options (Details) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended			3 Months Ended	9 Months Ended					3 Months Ended		9 Months Ended
	Sep. 30, 2011 Year issuers day month investments	Sep. 30, 2010	Dec. 31, 2010	Sep. 30, 2011 Minimum [Member] Restricted Stock Units (RSUs) [Member] Year	Sep. 30, 2011 Maximum [Member] Restricted Stock Units (RSUs) [Member] Year	Sep. 30, 2011 Restricted Stock Units (RSUs) [Member]	Sep. 30, 2011 Performance Share Awards [Member]	Sep. 30, 2011 Restricted Stock Units and Performance Share Awards [Member]	Dec. 31, 2010 Restricted Stock Units and Performance Share Awards [Member]	Sep. 30, 2011 Employee Stock Purchase Plan 2008 [Member]	Sep. 30, 2010 Employee Stock Purchase Plan 2008 [Member]	Sep. 30, 2011 Employee Stock Purchase Plan [Member] Year month
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								18,900,000	14,200,000
Beginning Balance, Weighted Average Grant-Date Fair Value								$ 31.88	$ 25.94
Awards Granted, Number of Shares						4,500,000	4,100,000
Awards Granted, Weighted Average Grant-Date Fair Value						$ 38.58	$ 40.18
Awards Vested, Number of Shares						(1,400,000)	(800,000)
Awards Vested, Weighted Average Grant-Date Fair Value						$ 22.86	$ 24.76
Awards Canceled, Number of Shares						(700,000)	(1,000,000)
Awards Canceled, Weighted Average Grant-Date Fair Value						$ 31.49	$ 29.52
Ending Balance, Number of Shares								18,900,000	14,200,000
Ending Balance, Weighted Average Grant-Date Fair Value								$ 31.88	$ 25.94
RSUs and PSAs, Weighted Average Remaining Contractual Term at Period End	1.7
RSUs and PSAs, Aggregate Intrinsic Value at Period End	$ 329.4
Vested and Expected-to-Vest RSUs and PSAs, Number of Shares at Period End	16,400,000
Vested and Expected-to-Vest RSUs and PSAs, Weighted Average Grant-Date Fair Value at Period End	$ 31.40
Vested and Expected-to-Vest RSUs and PSAs, Weighted Average Remaining Contractual Term at Period End	1.6
Vested and Expected-to-Vest RSUs and PSAs, Aggregate Intrinsic Value at Period End	$ 282.9
Aggregate Number Of Shares Subject to PSAs Granted							1,700,000
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							4,100,000
Employee Stock Purchase Plan
Stock based compensation incremental Board approved offering period in months												6
Stock Issued During Period, Shares, Employee Stock Purchase Plans	2,400,000	2,000,000								1,400,000	1,000,000
Average Price of Common Stock, Per Share	$ 21.53	$ 21.20								$ 19.88	$ 21.30
Common Stock, Shares, Issued	525,726,000		525,378,000									6,000,000
Common Stock, Capital Shares Reserved for Future Issuance	107,000,000											6,000,000