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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Net income $ 355 $ 109 $ 554 $ 178
Other comprehensive income, net of tax        
Unrealized holding gains arising during the period 86 [1] 192 [1] 88 [1] 144 [1]
Less: reclassification adjustments for securities gains realized in net income 8 [1] 16 [1] 16 [1] 69 [1]
Net change in unrealized gains on securities available for sale 78 [1] 176 [1] 72 [1] 75 [1]
Unrealized gains on derivative instruments designated as cash flow hedges:        
Unrealized holding gains on derivatives arising during the period 37 [1] 55 [1] 47 [1] 56 [1]
Less: reclassification adjustments for gains realized in net income 11 [1] 29 [1] 21 [1] 60 [1]
Net change in unrealized gains (losses) on derivative instruments 26 [1] 26 [1] 26 [1] (4) [1]
Defined benefit pension plans and other post employment benefits:        
Amortization of actuarial loss and prior service cost realized in net income, and other 10 [1] 8 [1] 25 [1] 12 [1]
Net change from defined benefit pension plans 10 [1] 8 [1] 25 [1] 12 [1]
Other comprehensive income, net of tax 114 [1] 210 [1] 123 [1] 83 [1]
Comprehensive income $ 469 $ 319 $ 677 $ 261
[1] All other comprehensive amounts are shown net of tax.