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Accumulated Other Comprehensive Income (Loss) - Impact to Net Income for Items Reclassified out of Accumulated Other Comprehensive Income and into Earnings (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Realized gains (losses) on sale of securities $ 3 $ 9 $ 8 $ 21
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, Interest income 3,047 3,038 6,069 6,149
Gains (Losses) on derivative hedges 2,689 2,616 5,339 5,269
Actuarial gains (losses), prior service cost (credit) and transition obligation (asset) amortization (257) (277) (546) (587)
Total securities gains (losses), net   6 5 11
Applicable income taxes (547) (529) (1,043) (1,087)
Net income 1,509 1,444 2,921 2,831
Reclassification out of Accumulated Other Comprehensive Income [Member]
       
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net income (44) (49) (89) (104)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Securities Available-For-Sale [Member]
       
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Realized gains (losses) on sale of securities 3 9 8 21
Other-than-temporary impairment recognized in earnings (3) (3) (3) (10)
Total securities gains (losses), net    6 5 11
Applicable income taxes    (2) (2) (4)
Net income    4 3 7
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Securities Transferred From Available For Sale to Held To Maturity [Member]
       
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, Interest income 9 17 16 37
Applicable income taxes (3) (7) (6) (14)
Net income 6 10 10 23
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Derivative Hedges [Member]
       
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Gains (Losses) on derivative hedges (45) (41) (94) (95)
Applicable income taxes 17 16 36 37
Net income (28) (25) (58) (58)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Retirement Plans [Member]
       
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Actuarial gains (losses), prior service cost (credit) and transition obligation (asset) amortization (36) (62) (72) (124)
Applicable income taxes 14 24 28 48
Net income $ (22) $ (38) $ (44) $ (76)