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Debt Securities Available for Sale - Weighted average yield and contractual maturities of debt securities AFS - Parenthetical (Details) - Debt securities available-for-sale - USD ($)
$ in Billions
Dec. 31, 2021
Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]    
Pledged Financial Instruments, Not Separately Reported, Securities $ 22.0 $ 18.2
Pledged Financial Instruments, Not Separately Reported, Securities for Other Debt Facilities $ 20.9 $ 16.9