Investment Securities - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Marketable Securities [Abstract]
Gains (losses) on available-for-sale securities	$ 0	$ 0	$ 0	$ 0
Available-for-sale, accrued interest, after allowance for credit loss	29,000,000		29,000,000		$ 32,000,000
Transfers between available for sale and held to maturity debt securities	0		0
Held-to-maturity, accrued interest, after allowance for credit loss	3,000,000		3,000,000		3,000,000
Allowance for credit loss	0		0		0
Carrying amount of equity investments without a readily determinable fair value	87,000,000		87,000,000		$ 79,000,000
Unrealized gains (losses) for equity investments with readily determinable fair values	$ 1,000,000	$ (2,000,000)	$ 7,000,000	$ (15,000,000)