Investment Securities - Narrative (Details) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Marketable Securities [Abstract]
Gains (losses) on available-for-sale securities	$ 0	$ 0
Proceeds from sales of securities available for sale	0	6,000,000	$ 0	$ 33,000,000
Available-for-sale, accrued interest, after allowance for credit loss	27,000,000		27,000,000		$ 23,000,000
Held-to-maturity, accrued interest, after allowance for credit loss	1,000,000		1,000,000		1,000,000
Allowance for credit loss	0		0		0
Carrying amount of equity investments without a readily determinable fair value	72,000,000		72,000,000		$ 70,000,000
Unrealized (losses) gains for equity investments with readily determinable fair values	$ 9,000,000	$ 3,000,000	$ 13,000,000	$ 6,000,000

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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Amount, after allowance for credit loss, of accrued interest on investment in debt security measured at amortized cost (held-to-maturity).

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