Other Assets (Schedule of Equity Securities without Readily Determinable Fair Value) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Other Assets [Abstract]
FRB stock	$ 419,000,000		$ 419,000,000		$ 401,000,000
FHLB stock	338,000,000		338,000,000		318,000,000
Equity investments without a readily determinable fair value
Cost basis at acquisition	73,000,000		73,000,000		89,000,000
Upward adjustments	50,000,000		50,000,000		177,000,000
Downward adjustments (including impairment)	(23,000,000)		(23,000,000)		(143,000,000)
Carrying amount, equity investments without a readily determinable fair value	100,000,000		100,000,000		123,000,000
Nonmarketable equity investments	857,000,000		857,000,000		$ 842,000,000
Upward adjustments	0	$ 0	7,000,000	$ 1,000,000
Downward adjustments (including impairment)	0	(137,000,000)	(17,000,000)	(140,000,000)
Impairment of FHLB and FRB stock	0	0	0	0
Loss on nonmarketable equity investments, net	$ 0	$ 135,000,000	$ 11,000,000	$ 133,000,000