Securitizations and Variable Interest Entities (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Securitizations And Variable Interest Entities [Abstract]
Gain (loss) on sales of financial assets	$ 1,000,000	$ 1,000,000	$ 0
Investment in qualified affordable housing projects	1,866,000,000	1,596,000,000
Unfunded commitments for investment in qualified affordable housing projects	$ 973,000,000	$ 869,000,000
Qualified affordable housing project investments, funding commitment period	5 years