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Shareholders' Equity (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Reconciliation of the transactions affecting accumulated other comprehensive income (loss) included in shareholders' equity      
Changes in unrealized gains and losses on securities available-for-sale $ 920 $ 432 $ 2,131
Other-than-temporary impairment not recognized in earnings on securities available-for-sale (25) (66) (402)
Unrealized gain (loss) on derivative hedges (343) (145) 516
Foreign currency translation (16) 24 40
Realized loss on derivative hedges 0    
Reclassification for realized (gains) losses 363 (28) 492
Unrealized gains (losses) on retirement plans (464) (197) 254
Total, before tax 435 20 3,031
Changes in unrealized gains and losses on securities available-for-sale (351) (163) (810)
Other-than-temporary impairment not recognized in earnings on securities available-for-sale 10 25 153
Unrealized gain (loss) on derivative hedges 130 56 (196)
Foreign currency translation 6 (10) (15)
Realized loss on derivative hedges 0    
Reclassification for realized (gains) losses (138) 11 (187)
Unrealized gains (losses) on retirement plans 177 76 (97)
Total, tax effect (166) (5) (1,152)
Changes in unrealized gains and losses on securities available-for-sale 569 269 1,321
Other-than-temporary impairment not recognized in earnings on securities available-for-sale (15) (41) (249)
Unrealized gain (loss) on derivative hedges (213) (89) 320
Foreign currency translation (10) 14 25
Realized loss on derivative hedges 0    
Reclassification for realized (gains) losses 225 (17) 305
Unrealized gains (losses) on retirement plans (287) (121) 157
Total , net of tax 269 15 1,879
Changes in unrealized gains and losses on securities available-for-sale 360 (213) (393)
Unrealized gain (loss) on derivative hedges (484) (408) (319)
Foreign currency translation (49) (39) (53)
Realized loss on derivative hedges (5) (6) (8)
Change in retirement obligation (1,022) (803) (711)
Accumulated other comprehensive income (loss) $ (1,200) $ (1,469) $ (1,484)