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Parent Company - Parent Company's Borrowings with Original Maturities Greater than One Year (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Senior $ 213,776 $ 202,305
Subordinated 13,587 11,083
Total 227,363 213,388
Parent Company    
Debt Instrument [Line Items]    
Senior 155,304 148,885
Subordinated 13,591 11,094
Total $ 168,895 $ 159,979