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Accumulated Other Comprehensive Income (Loss) - Impact to Consolidated Statement of Income for Items Reclassified Out of Accumulated Other Comprehensive Income and into Earnings (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Changes in unrealized gains and losses on securities available-for-sale    
Realized gains (losses) on sale of securities $ 12 $ 9
Other-than-temporary impairment recognized in earnings (7)  
Total before tax 5  
Applicable income taxes (2)  
Net-of-tax 3  
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, Interest income 20  
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, Applicable income taxes (7)  
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, Net-of-tax 13  
Changes in unrealized gains and losses on derivative hedges    
Gains (Losses) on derivative hedges (54) (53)
Applicable income taxes 21  
Net-of-tax (33)  
Unrealized gains (losses) on retirement plans    
Actuarial gains (losses), prior service cost (credit) and transition obligation (asset) amortization (62) (38)
Applicable income taxes 24  
Net-of-tax (38)  
Total impact to net income $ (55)