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Shareholders' Equity - Reconciliation of Transactions Affecting Accumulated Other Comprehensive Income (Loss) Included in Shareholders' Equity (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at beginning of period $ (1,404) $ (1,535) $ (1,019)
Revaluation of tax related balances (300)    
Changes in unrealized gains and losses (656) 178 (858)
Changes in unrealized gains and losses 39 (5) 74
Changes in unrealized gains and losses (302) (41) (255)
Changes in unrealized gains and losses (919) 132 (1,039)
Other-than-temporary impairment not recognized in earnings on securities available-for-sale     (1)
Foreign currency translation adjustment 3 (2) (28)
Reclassification to earnings of realized gains and losses 93 77 247
Applicable income taxes 205 (76) 305
Balance at end of period (2,322) (1,404) (1,535)
Foreign Currency Translation [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at beginning of period (69) (71) (43)
Revaluation of tax related balances (13)    
Foreign currency translation adjustment 3 (2) (28)
Applicable income taxes (5) 4  
Balance at end of period (84) (69) (71)
Unrealized Gains (Losses) on Retirement Plans [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at beginning of period (1,066) (1,113) (1,056)
Revaluation of tax related balances (229)    
Changes in unrealized gains and losses (302) (41) (255)
Reclassification to earnings of realized gains and losses 137 117 163
Applicable income taxes 42 (29) 35
Balance at end of period (1,418) (1,066) (1,113)
Unrealized Gains (Losses) on Derivative Hedges [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at beginning of period 71 55 (67)
Revaluation of tax related balances 15    
Changes in unrealized gains and losses 39 (5) 74
Reclassification to earnings of realized gains and losses (5) 30 124
Applicable income taxes (8) (9) (76)
Balance at end of period 112 71 55
Unrealized Gains (Losses) on Investment Securities Transferred From Available For Sale to Held To Maturity [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at beginning of period 17 25 36
Revaluation of tax related balances 4    
Reclassification to earnings of realized gains and losses (9) (13) (18)
Applicable income taxes 2 5 7
Balance at end of period 14 17 25
Unrealized Gains (Losses) on Investment Securities Available-For-Sale [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at beginning of period (357) (431) 111
Revaluation of tax related balances (77)    
Changes in unrealized gains and losses (656) 178 (858)
Other-than-temporary impairment not recognized in earnings on securities available-for-sale     (1)
Reclassification to earnings of realized gains and losses (30) (57) (22)
Applicable income taxes 174 (47) 339
Balance at end of period $ (946) $ (357) $ (431)