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Stockholders' Equity and Accumulated Other Comprehensive Income (Loss) (Schedule of Accumulated Other Comprehensive Income (Loss)) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Stockholders' Equity And Comprehensive Income (Loss) [Line Items]        
Unrealized gains on securities available for sale, Beginning of Period $ 316 $ (24) $ 322 $ 77
Unrealized gains on securities available for sale, Net Change 78 [1] 176 [1] 72 [1] 75 [1]
Unrealized gains on securities available for sale, End of Period 394 152 394 152
Unrealized gains on derivative instruments designated as, Beginning of Period 84 (39) 84 (9)
Unrealized gains on derivative instruments designated as, Net Change 26 [1] 26 [1] 26 [1] (4) [1]
Unrealized gains on derivative instruments designated as, End of Period 110 (13) 110 (13)
Defined benefit pension plans and other post employment benefits, Beginning of Period (460) (324) (475) (328)
Defined benefit pension plans and other post employment benefits, Net Change 10 [1] 8 [1] 25 [1] 12 [1]
Defined benefit pension plans and other post employment benefits, End of Period (450) (316) (450) (316)
Other comprehensive income, net of tax, Beginning of Period (60) (387) (69) (260)
Other comprehensive income, net of tax, Net Change 114 210 123 83
Other comprehensive income, net of tax, End of Period $ 54 $ (177) $ 54 $ (177)
[1] All other comprehensive amounts are shown net of tax.