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Shareholders' Equity - Reconciliation of Transactions Affecting Accumulated Other Comprehensive Income (Loss) Included in Shareholder's Equity (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Changes in unrealized gains and losses on securities available-for-sale $ 491 $ 920 $ 277
Other-than-temporary impairment not recognized in earnings on securities available-for-sale 12 (25) (66)
Changes in unrealized gains on securities transferred from available-for-sale to held-to-maturity 173    
Changes in unrealized gains (losses) on derivative hedges (74) (343) (383)
Foreign currency translation 14 (16) 24
Reclassification to earnings of realized gains and losses 376 363 365
Unrealized gains (losses) on retirement plans (543) (464) (197)
Total, before tax 449 435 20
Changes in unrealized gains and losses on securities available-for-sale (188) (351) (105)
Other-than-temporary impairment not recognized in earnings on securities available-for-sale (5) 10 25
Changes in unrealized gains on securities transferred from available-for-sale to held-to-maturity (66)    
Changes in unrealized gains (losses) on derivative hedges 28 130 148
Foreign currency translation (5) 6 (10)
Reclassification to earnings of realized gains and losses (144) (138) (139)
Unrealized gains (losses) on retirement plans 208 177 76
Total, tax effect (172) (166) (5)
Changes in unrealized gains and losses on securities available-for-sale 303 569 172
Other-than-temporary impairment not recognized in earnings on securities available-for-sale 7 (15) (41)
Changes in unrealized gains on securities transferred from available-for-sale to held-to-maturity 107    
Changes in unrealized gains (losses) on derivative hedges (46) (213) (235)
Foreign currency translation 9 (10) 14
Reclassification to earnings of realized gains and losses 232 225 226
Unrealized gains (losses) on retirement plans (335) (287) (121)
Total other comprehensive income (loss) 277 269 15
Changes in unrealized gains and losses on securities available-for-sale 679 360 (213)
Other-than-temporary impairment not recognized in earnings on securities available-for-sale         
Changes in unrealized gains on securities transferred from available-for-sale to held-to-maturity 107    
Changes in unrealized gains (losses) on derivative hedges (404) (489) (414)
Foreign currency translation (40) (49) (39)
Reclassification to earnings of realized gains and losses         
Unrealized gains (losses) on retirement plans (1,265) (1,022) (803)
Total $ (923) $ (1,200) $ (1,469)