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Other Assets - Schedule of Equity Securities without Readily Determinable Fair Value (Details) - USD ($)
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Other Assets [Abstract]      
FRB stock $ 413,000,000   $ 440,000,000
FHLB stock 280,000,000   258,000,000
Equity investments without a readily determinable fair value      
Cost basis 76,000,000   74,000,000
Upward adjustments 53,000,000   53,000,000
Downward adjustments (including impairment) (36,000,000)   (36,000,000)
Carrying amount, equity investments without a readily determinable fair value 93,000,000   91,000,000
Nonmarketable equity investments 786,000,000   $ 789,000,000
Upward adjustments 0 $ 1,000,000  
Downward adjustments (including impairment) 0 0  
Impairment of FHLB and FRB stock $ 0 $ 0