Investment Securities - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Marketable Securities [Abstract]
Gain on sale of debt investment securities	$ 0	$ 0	$ 0
Loss on sale of debt investment securities	0	4,000,000	0
Proceeds from sales		629,000,000	$ 192,000,000
Available-for-sale, accrued interest, after allowance for credit loss	23,000,000	22,000,000
Held-to-maturity, accrued interest, after allowance for credit loss	1,000,000
Allowance for credit losses for HTM securities	0	0
Carrying amount of equity method investments without readily determinable fair value	70,000,000	57,000,000
Unrealized gain (loss) for equity investments with readily determinable fair value	$ 3,000,000	$ 7,000,000