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Income Taxes - Effective tax rates (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income tax reconciliation      
Tax expense (benefit) at the U.S. federal statutory income tax rate $ (318) $ 239 $ 506
State and local taxes, net of federal benefit 46 92 28
Adjustment of tax rate used to value deferred taxes (13) 0 (84)
Non-deductible expense accrual related to certain regulatory matters 483 [1] 0 0
Non-deductible goodwill related to branch sale 139 [1] 0 0
Valuation allowance 0 (217) [2] (26)
Accrual of tax reserves 45 [3] 161 [3] 75 [3]
Impact of foreign operations 51 [4] 63 [4] 56 [4]
Tax exempt interest income (14) (10) (12)
Low income housing and other tax credits (85) (115) (111)
Non-taxable income 0 (4) (5)
Other 4 18 12
Total $ 338 $ 227 $ 439
Effective income tax reconciliation      
Tax expense (benefit) at the U.S. federal statutory income tax rate, percentage (35.00%) 35.00% 35.00%
State and local taxes, net of federal benefit, percentage 5.00% 13.50% 1.90%
Adjustment of tax rate used to value deferred taxes, percentage (1.40%) 0.00% (5.80%)
Non-deductible expense accrual related to certain regulatory matters, percentage 53.10% [1] 0.00% 0.00%
Non-deductible goodwill related to branch sale, percentage 15.30% [1] 0.00% 0.00%
Valuation allowance, percentage 0.00% (31.80%) [2] (1.80%)
Accural of tax reserves, percentage 4.90% [3] 23.60% [3] 5.20% [3]
Impact of foreign operations, percentage 5.60% [4] 9.20% [4] 3.90% [4]
Tax exempt interest income, percentage (1.50%) (1.50%) (0.80%)
Low income housing and other tax credits, percentage (9.30%) (16.90%) (7.70%)
Non-taxable income, percentage 0.00% (0.60%) (0.30%)
Other, percentage 0.40% 2.80% 0.80%
Effective tax rate, percentage 37.10% 33.30% 30.40%
[1] For 2012, largely impacted by non-deductible expense related to certain regulatory matters and non-deductible goodwill related to the branches sold to First Niagara.
[2] For 2011, relates to release of valuation allowance previously established on foreign tax credits.
[3] Tax reserves in 2012, 2011 and 2010, relate to state uncertain tax positions which we no longer believe we meet the more likely than not requirement for recognition. Specifically, the increase in 2011 relates to a state court decision that required us to increase our reserves.
[4] For 2012, relates to foreign (U.K.) tax expense for which no foreign tax credits are allowed, and for 2011 and 2010, primarily related to an accrued foreign tax expense related to Brazilian withholding taxes reversed in 2010 - 2012.