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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period $ (1,773) $ (2,193) $ (2,322) $ (1,404)
Revaluation of tax related balances       (300)
Changes in unrealized gains and losses 721 (212) 1,506 (988)
Changes in unrealized gains and losses (135) 33 (209) 119
Changes in unrealized gains and losses   2   (1)
Changes in unrealized gains and losses 586 (177) 1,297 (870)
Foreign currency translation adjustment (8) (8) 8 5
Reclassification to earnings of realized gains and losses (4) 21 4 50
Applicable income taxes (145) 42 (331) 204
Balance at end of period (1,344) (2,315) (1,344) (2,315)
Foreign Currency Translation [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period (72) (76) (84) (69)
Revaluation of tax related balances       (13)
Foreign currency translation adjustment (8) (8) 8 5
Applicable income taxes 2 3 (2) (4)
Balance at end of period (78) (81) (78) (81)
Unrealized Gains (Losses) on Retirement Plans [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period (1,402) (1,271) (1,418) (1,066)
Revaluation of tax related balances       (229)
Changes in unrealized gains and losses   2   (1)
Reclassification to earnings of realized gains and losses 22 35 44 69
Applicable income taxes (5) (10) (11) (17)
Balance at end of period (1,385) (1,244) (1,385) (1,244)
Unrealized Gains (Losses) on Derivative Hedges [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period 51 152 112 71
Revaluation of tax related balances       15
Changes in unrealized gains and losses (135) 33 (209) 119
Reclassification to earnings of realized gains and losses (6) (2) (14) 1
Applicable income taxes 35 (7) 56 (30)
Balance at end of period (55) 176 (55) 176
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 13 19 14 17
Revaluation of tax related balances       4
Reclassification to earnings of realized gains and losses (3) (2) (4) (5)
Applicable income taxes 1   1 1
Balance at end of period 11 17 11 17
Unrealized Gains (Losses) on Investment Securities Available-For-Sale [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period (363) (1,017) (946) (357)
Revaluation of tax related balances       (77)
Changes in unrealized gains and losses 721 (212) 1,506 (988)
Reclassification to earnings of realized gains and losses (17) (10) (22) (15)
Applicable income taxes (178) 56 (375) 254
Balance at end of period $ 163 $ (1,183) $ 163 $ (1,183)