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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period $ (2,315) $ (1,246) $ (1,404) $ (1,535)
Revaluation of tax related balances     (300)  
Changes in unrealized gains and losses (411) 24 (1,399) 479
Changes in unrealized gains and losses 40 (3) 159 (33)
Changes in unrealized gains and losses     (1)  
Changes in unrealized gains and losses (371) 21 (1,241) 446
Foreign currency translation adjustment 7 2 12 11
Reclassification to earnings of realized gains and losses 20 21 70 58
Applicable income taxes 86 (17) 290 (199)
Balance at end of period (2,573) (1,219) (2,573) (1,219)
Foreign Currency Translation [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period (81) (67) (69) (71)
Revaluation of tax related balances     (13)  
Foreign currency translation adjustment 7 2 12 11
Applicable income taxes (2)   (6) (5)
Balance at end of period (76) (65) (76) (65)
Unrealized Gains (Losses) on Retirement Plans [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period (1,244) (1,077) (1,066) (1,113)
Revaluation of tax related balances     (229)  
Changes in unrealized gains and losses     (1)  
Reclassification to earnings of realized gains and losses 34 29 103 87
Applicable income taxes (9) (11) (26) (33)
Balance at end of period (1,219) (1,059) (1,219) (1,059)
Unrealized Gains (Losses) on Derivative Hedges [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period 176 51 71 55
Revaluation of tax related balances     15  
Changes in unrealized gains and losses 40 (3) 159 (33)
Reclassification to earnings of realized gains and losses (2) 4 (1) 28
Applicable income taxes (10)   (40) 2
Balance at end of period 204 52 204 52
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 21 17 25
Revaluation of tax related balances     4  
Reclassification to earnings of realized gains and losses (2) (3) (7) (10)
Applicable income taxes   1 1 4
Balance at end of period 15 19 15 19
Unrealized Gains (Losses) on Investment Securities Available-For-Sale [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period (1,183) (174) (357) (431)
Revaluation of tax related balances     (77)  
Changes in unrealized gains and losses (411) 24 (1,399) 479
Reclassification to earnings of realized gains and losses (10) (9) (25) (47)
Applicable income taxes 107 (7) 361 (167)
Balance at end of period $ (1,497) $ (166) $ (1,497) $ (166)