Investment Securities - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Marketable Securities [Abstract]
Gains (losses) on available-for-sale securities	$ 0	$ 0	$ 0	$ 0
Available-for-sale, accrued interest, after allowance for credit loss	28,000,000		28,000,000		$ 32,000,000
Transfers between available for sale and held to maturity debt securities	0	0	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	91,000,000		91,000,000		$ 89,000,000
Unrealized gains for equity investments with readily determinable fair values (prior year QTD less than)	$ 4,000,000	$ 1,000,000	$ 11,000,000	$ 7,000,000