Other Assets (Schedule of Equity Securities without Readily Determinable Fair Value) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Other Assets [Abstract]
FRB stock	$ 411,000,000		$ 392,000,000
FHLB stock	230,000,000		392,000,000
Equity investments without a readily determinable fair value
Cost basis at acquisition	76,000,000		74,000,000
Upward adjustments	53,000,000		51,000,000
Downward adjustments (including impairment)	(23,000,000)		(23,000,000)
Carrying amount, equity investments without a readily determinable fair value	106,000,000		102,000,000
Nonmarketable equity investments	747,000,000		$ 886,000,000
Upward adjustments	1,000,000	$ 5,000,000
Downward adjustments (including impairment)	0	(17,000,000)
Impairment of FHLB and FRB stock	$ 0	$ 0