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Parent Company - Group Statement of Earnings (Parenthetical) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Condensed Income Statements, Captions [Line Items]      
Other comprehensive income/(loss) $ (634) $ 50 $ (2,177)
Group Inc. [Member]      
Condensed Income Statements, Captions [Line Items]      
Cash dividends from bank subsidiaries 16,990 38 60
Cash dividends from nonbank subsidiaries 15,140 11,320 4,180
Revenues with subsidiaries (1,010) 2,620 1,290
Interest income with subsidiaries 3,390 3,680 7,260
Interest expense with subsidiaries 1,240 1,730 3,150
Other expenses with subsidiaries 113 100 138
Other comprehensive income/(loss) $ (634) $ 50 $ (2,180)