Investment Securities - Narrative (Details) - USD ($)	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Marketable Securities [Abstract]
Gains (losses) on available-for-sale securities	$ 0	$ 0
Loss on sale of debt investment securities			$ 0
Gain on sale of debt investment securities			0
Proceeds from sales and prepayments of securities	0	0	68,000,000
Available-for-sale, accrued interest, after allowance for credit loss	32,000,000	32,000,000
Held-to-maturity, accrued interest, after allowance for credit loss	3,000,000	3,000,000
Allowance for credit losses for HTM securities	0	0
Carrying amount of equity method investments without readily determinable fair value	89,000,000	79,000,000
Downward valuation adjustment	6,000,000	0
Unrealized gains (losses) for equity investments with readily determinable fair value	$ 11,000,000	$ (11,000,000)	$ 3,000,000

Amount, after allowance for credit loss, of accrued interest on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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