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Investment Securities (Details 2) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract]
Number of securities, less than 12 months	22	46
Number of securities, 12 months or more	4	4
Number of securities, total	26	50
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Estimated Fair Value, Less than 12 months	$ 93	$ 100
Estimated Fair Value, 12 months or more	75	73
Estimated Fair Value, Total	168	173
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Gross Unrealized Losses, Less than 12 months	(2)	(1)
Gross Unrealized Losses, 12 months or more	(3)	(4)
Gross Unrealized Losses, Total	(5)	(5)
Ratio Of Fair Value To Amortized Cost Between Ninety And One Hundred Percent [Member]
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract]
Number of securities, less than 12 months	22	46
Number of securities, 12 months or more	4	4
Number of securities, total	26	50
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Estimated Fair Value, Less than 12 months	93	100
Estimated Fair Value, 12 months or more	75	73
Estimated Fair Value, Total	168	173
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Gross Unrealized Losses, Less than 12 months	(2)	(1)
Gross Unrealized Losses, 12 months or more	(3)	(4)
Gross Unrealized Losses, Total	$ (5)	$ (5)

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