Investment Securities (Details 4) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Summary of other-than-temporary impairment by investment category
Other Gains (losses)	$ (10)	$ (9)	$ (15)	$ (50)
Total other-than-temporary impairment	19	30	30	117
Held-to-maturity Securities [Member]
Summary of other-than-temporary impairment by investment category
Losses Recorded in Earnings				(2)
Total other-than-temporary impairment				(2)
Held-to-maturity Securities [Member] | Others [Member]
Summary of other-than-temporary impairment by investment category
Losses Recorded in Earnings				(2)
Total other-than-temporary impairment				(2)
Non agency Prime [Member] | Available for sale Securities [Member] | Residential [Member]
Summary of other-than-temporary impairment by investment category
Losses Recorded in Earnings	(1)	(1)	(2)	(3)
Other Gains (losses)	(4)	(1)	(3)	(10)
Total other-than-temporary impairment	(5)	(2)	(5)	(13)
Non agency Non Prime [Member] | Available for sale Securities [Member] | Residential [Member]
Summary of other-than-temporary impairment by investment category
Losses Recorded in Earnings	(7)	(11)	(12)	(46)
Other Gains (losses)	(6)	(11)	(12)	(43)
Total other-than-temporary impairment	(13)	(22)	(24)	(89)
Available for sale Securities [Member]
Summary of other-than-temporary impairment by investment category
Losses Recorded in Earnings	(9)	(21)	(15)	(65)
Other Gains (losses)	(10)	(9)	(15)	(50)
Total other-than-temporary impairment	(19)	(30)	(30)	(115)
Available for sale Securities [Member] | Other Debt Securities [Member]
Summary of other-than-temporary impairment by investment category
Losses Recorded in Earnings				(1)
Other Gains (losses)				1
Available for sale Securities [Member] | Collateralized Debt Obligations [Member]
Summary of other-than-temporary impairment by investment category
Losses Recorded in Earnings		(4)		(5)
Total other-than-temporary impairment		(4)		(5)
Available for sale Securities [Member] | Others [Member]
Summary of other-than-temporary impairment by investment category
Losses Recorded in Earnings	(1)	(5)	(1)	(10)
Other Gains (losses)		3		2
Total other-than-temporary impairment	$ (1)	$ (2)	$ (1)	$ (8)