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Derivatives - Derivatives Associated With Cash Flow Hedges and Mortgage Banking Hedges (Details) - Hedging Instruments And Hedged Items - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Cash Flow Hedges | Interest Rate Contract |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Variability in cash flows related to debt instruments (primarily loans) | $ 1,100 | $ 1,250
Cash Flow Hedges | Interest rate contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | 1,100 | 1,250
Assets | 13 | 32
Liabilities | 0 | 0
Mortgage Banking Hedges | Interest Rate Lock |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | 241 | 667
Assets | 4 | 20
Liabilities | 0 | 0
Mortgage Banking Hedges | Forward contracts written |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | 404 | 725
Assets | 0 | 0
Liabilities | $ 0 | $ 6

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