Investment Securities (Details 4) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Summary of other-than-temporary impairment by investment category
Other Gains (losses)	$ (2)	$ (10)	$ (17)	$ (60)
Total other-than-temporary impairment	11	28	41	145
Other [Member] | 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]
Summary of other-than-temporary impairment by investment category
Losses Recorded in Earnings				(2)
Total other-than-temporary impairment				(2)
Residential [Member] | Non-agency Prime [Member] | Available for sale Securities [Member]
Summary of other-than-temporary impairment by investment category
Losses Recorded in Earnings		(1)	(2)	(4)
Other Gains (losses)		(1)	(3)	(11)
Total other-than-temporary impairment		(2)	(5)	(15)
Residential [Member] | Non-agency Non-prime [Member] | Available for sale Securities [Member]
Summary of other-than-temporary impairment by investment category
Losses Recorded in Earnings	(6)	(13)	(18)	(59)
Other Gains (losses)	(4)	(11)	(16)	(54)
Total other-than-temporary impairment	(10)	(24)	(34)	(113)
Collateralized Debt Obligations [Member] | Available for sale Securities [Member]
Summary of other-than-temporary impairment by investment category
Losses Recorded in Earnings		(1)		(6)
Total other-than-temporary impairment		(1)		(6)
Other [Member] | Available for sale Securities [Member]
Summary of other-than-temporary impairment by investment category
Losses Recorded in Earnings	(3)	(2)	(4)	(12)
Other Gains (losses)	2	2	2	4
Total other-than-temporary impairment	(1)		(2)	(8)
Other Debt Securities [Member] | Available for sale 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]
Summary of other-than-temporary impairment by investment category
Losses Recorded in Earnings	(9)	(18)	(24)	(83)
Other Gains (losses)	(2)	(10)	(17)	(60)
Total other-than-temporary impairment	(11)	(28)	(41)	(143)
Available for sale Securities [Member] | Perpetual preferred securities [Member]
Summary of other-than-temporary impairment by investment category
Losses Recorded in Earnings		(1)		(1)
Total other-than-temporary impairment		$ (1)		$ (1)