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Other Assets (Summary of Equity Securities without Readily Determinable Fair Value) (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Other Assets [Abstract]      
FHLB stock $ 318,000,000 $ 289,000,000  
FRB stock 401,000,000 449,000,000  
Equity investments without a readily determinable fair value      
Cost basis at acquisition 89,000,000 89,000,000  
Upward adjustments 177,000,000 183,000,000  
Downward adjustments (including impairment) (143,000,000) (12,000,000)  
Carrying amount, equity investments without a readily determinable fair value 123,000,000 260,000,000  
Nonmarketable equity investments 842,000,000 998,000,000  
Upward adjustments 1,000,000 88,000,000  
Downward adjustments (including impairment) (138,000,000) (1,000,000)  
Impairment of FHLB and FRB stock 0 0  
(Loss) gain on nonmarketable equity investments, net $ (132,000,000) $ 142,000,000 $ 99,000,000