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Consolidated Statement of Comprehensive Income (Loss) (Unaudited) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Statement of Comprehensive Income [Abstract]    
Net income $ 600 $ 796
Other comprehensive income (loss):    
Changes in net unrealized gains on investment securities having no credit losses recognized in the consolidated statement of income (575) 1,416
Changes in net unrealized gains on investment securities having credit losses recognized in the consolidated statement of income (6) 5
Net changes in benefit plan assets and obligations 23 12
Net changes in unrealized foreign currency translation (268) 50
Other comprehensive income (loss) before income taxes (826) 1,483
Income tax expense (benefit) (137) 306
Other comprehensive income (loss), net of taxes (689) 1,177
Comprehensive income (loss) $ (89) $ 1,973