Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Effective Tax Rates
Tax expense (benefit) at the US federal statutory income tax rate	$ (84)	$ 32	$ (50)	$ 134
Tax expense (benefit) at the US federal statutory income tax rate, percentage	(35.00%)	35.00%	(35.00%)	35.00%
Increase (decrease) in rate resulting from:
State and local taxes, net of federal benefit	16	16	22	37
Adjustment of tax rate used to value deferred taxes		(8)		18
Valuation allowance on deferred tax assets		(8)	(10)	(143)
Non-deductible expense accrual related to certain regulatory matters	245		245
Non deductible goodwill related to sale of branches	106		106
Accrual of tax reserves	21		21
Tax exempt interest income	(3)	(2)	(5)	(5)
Low income housing and other tax credits	(25)	(21)	(57)	(42)
Impact of foreign operations	29	7	36	8
Uncertain tax provision	49	127	65	127
Other	(3)	(9)	(4)	(13)
Effective tax rate	$ 351	$ 134	$ 369	$ 121
State and local taxes, net of federal benefit, percentage	6.50%	17.80%	15.20%	9.70%
Adjustment of tax rate used to value deferred taxes, percentage		(8.90%)	(7.20%)	4.70%
Valuation allowance on deferred tax assets, percentage		(8.90%)		(37.40%)
Non-deductible expense accrual related to certain regulatory matters, Percentage	102.00%		171.30%
Non deductible goodwill related to sale of branches, percentage	44.30%		74.30%
Accrual of tax reserves, percentage	8.70%		14.70%
Tax exempt interest income, percentage	(1.20%)	(2.20%)	(3.40%)	(1.30%)
Low income housing and other tax credits, percentage	(10.30%)	(23.30%)	(39.70%)	(11.00%)
Impact of foreign operations, percentage	11.90%	7.80%	24.80%	2.10%
Uncertain tax provision, percentage	20.60%	141.10%	45.70%	33.20%
Other, percentage	(1.30%)	(9.50%)	(2.80%)	(3.30%)
Effective tax rate, percentage	146.20%	148.90%	257.90%	31.70%