Investment Securities - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Marketable Securities [Abstract]
Gains (losses) on available-for-sale securities	$ 0	$ 0
Available-for-sale, accrued interest, after allowance for credit loss	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
Allowance for credit loss	0		0
Carrying amount of equity investments without a readily determinable fair value	92,000,000		$ 89,000,000
Unrealized gains (losses) for equity investments with readily determinable fair values	$ 5,000,000	$ 2,000,000