v3.20.4
Parent Company - Group Statement of Earnings (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Condensed Income Statements, Captions [Line Items]      
Other comprehensive income/(loss) $ 50 $ (2,177) $ 2,573
Group Inc. [Member]      
Condensed Income Statements, Captions [Line Items]      
Cash dividends from bank subsidiaries 38 60 76
Cash dividends from nonbank subsidiaries 11,320 4,180 10,780
Revenues with subsidiaries 2,620 1,290 (1,690)
Interest income with subsidiaries 3,680 7,260 6,330
Interest expense with subsidiaries 1,730 3,150 2,390
Other expenses with subsidiaries 100 138 159
Other comprehensive income/(loss) $ 50 $ (2,180) $ 2,570