Investment Securities (Details 2) (USD $) In Millions, except Share data	Sep. 30, 2011	Dec. 31, 2010
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Estimated Fair Value, Less than 12 months	$ 465	$ 2,905
Estimated Fair Value, 12 months or more	1,114	1,079
Estimated Fair Value, Total	1,579	3,984
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Gross Unrealized Losses, Less than 12 months	(12)	(159)
Gross Unrealized Losses, 12 months or more	(93)	(212)
Gross Unrealized Losses, Total	(105)	(371)
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract]
Number of securities, less than 12 months	81	505
Number of securities, 12 months or more	137	146
Number of securities, total	218	651
Ratio Of Fair Value To Amortized Cost Between Ninety And One Hundred Percent [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Estimated Fair Value, Less than 12 months	430	2,554
Estimated Fair Value, 12 months or more	812	79
Estimated Fair Value, Total	1,242	2,633
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Gross Unrealized Losses, Less than 12 months	(8)	(113)
Gross Unrealized Losses, 12 months or more	(39)	(7)
Gross Unrealized Losses, Total	(47)	(120)
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract]
Number of securities, less than 12 months	79	457
Number of securities, 12 months or more	105	31
Number of securities, total	184	488
Ratio Of Fair Value To Amortized Cost Less Than Ninety Percent [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Estimated Fair Value, Less than 12 months	35	351
Estimated Fair Value, 12 months or more	302	1,000
Estimated Fair Value, Total	337	1,351
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Gross Unrealized Losses, Less than 12 months	(4)	(46)
Gross Unrealized Losses, 12 months or more	(54)	(205)
Gross Unrealized Losses, Total	$ (58)	$ (251)
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract]
Number of securities, less than 12 months	2	48
Number of securities, 12 months or more	32	115
Number of securities, total	34	163

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