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Accumulated Other Comprehensive Income (Loss) - Reconciliation of Transactions Affecting Accumulated Other Comprehensive Income (Loss) Included in Shareholders' Equity (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period $ (1,344) $ (2,315) $ (2,322) $ (1,404)
Revaluation of tax related balances       (300)
Changes in unrealized gains and losses 284 (411) 1,790 (1,399)
Changes in unrealized gains and losses (59) 40 (268) 159
Changes in unrealized gains and losses       (1)
Changes in unrealized gains and losses 225 (371) 1,522 (1,241)
Foreign currency translation adjustment 2 7 10 12
Reclassification to earnings of realized gains and losses 2 20 6 70
Applicable income taxes (58) 86 (389) 290
Balance at end of period (1,173) (2,573) (1,173) (2,573)
Foreign Currency Translation [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period (78) (81) (84) (69)
Revaluation of tax related balances       (13)
Changes in unrealized gains and losses     0  
Foreign currency translation adjustment 2 7 10 12
Reclassification to earnings of realized gains and losses     0  
Applicable income taxes   (2) (2) (6)
Balance at end of period (76) (76) (76) (76)
Unrealized Gains (Losses) on Retirement Plans [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period (1,385) (1,244) (1,418) (1,066)
Revaluation of tax related balances       (229)
Changes in unrealized gains and losses     0 (1)
Foreign currency translation adjustment     0  
Reclassification to earnings of realized gains and losses 22 34 66 103
Applicable income taxes (6) (9) (17) (26)
Balance at end of period (1,369) (1,219) (1,369) (1,219)
Unrealized Gains (Losses) on Derivative Hedges [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period (55) 176 112 71
Revaluation of tax related balances       15
Changes in unrealized gains and losses (59) 40 (268) 159
Foreign currency translation adjustment     0  
Reclassification to earnings of realized gains and losses 6 (2) (8) (1)
Applicable income taxes 14 (10) 70 (40)
Balance at end of period (94) 204 (94) 204
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 11 17 14 17
Revaluation of tax related balances       4
Changes in unrealized gains and losses     0  
Foreign currency translation adjustment     0  
Reclassification to earnings of realized gains and losses (1) (2) (5) (7)
Applicable income taxes     1 1
Balance at end of period 10 15 10 15
Unrealized Gains (Losses) on Investment Securities Available-For-Sale [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period 163 (1,183) (946) (357)
Revaluation of tax related balances       (77)
Changes in unrealized gains and losses 284 (411) 1,790 (1,399)
Foreign currency translation adjustment     0  
Reclassification to earnings of realized gains and losses (25) (10) (47) (25)
Applicable income taxes (66) 107 (441) 361
Balance at end of period $ 356 $ (1,497) $ 356 $ (1,497)