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Variable Interest Entities - Income Statement Effect (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Non-Interest Income      
Amortization of tax credit investments under equity method, net of tax benefit $ 1 $ 1 $ 1
Provision for income taxes:      
Amortization of LIHTC investments under proportional method 13 11 8
Low-income housing tax credits (15) (12) (9)
Other tax benefits related to tax credit investments (2) (2) (2)
Total impact on provision for income taxes $ (4) $ (3) $ (3)