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Goodwill and Intangible Assets Goodwill and Intangible Assets (Summary of CDI Carrying Value and Amortization) (Details) - Core deposit intangible - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 34 $ 34
Accumulated amortization (34) (33)
Net carrying amount $ 0 $ 1