Other Assets (Schedule of Equity Securities without Readily Determinable Fair Value) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Other Assets [Abstract]
FRB stock	$ 392,000,000	$ 401,000,000
FHLB stock	392,000,000	318,000,000
Equity investments without a readily determinable fair value
Cost basis at acquisition	74,000,000	89,000,000
Upward adjustments	51,000,000	177,000,000
Downward adjustments (including impairment)	(23,000,000)	(143,000,000)
Carrying amount, equity investments without a readily determinable fair value	102,000,000	123,000,000
Nonmarketable equity investments	886,000,000	842,000,000
Upward adjustments	8,000,000	1,000,000
Downward adjustments (including impairment)	(17,000,000)	(138,000,000)
Impairment of FHLB and FRB stock	$ 0	$ 0