Allowance for Credit Losses - Accrued Interest Receivables (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	$ 173		$ 173		$ 109
Securities held-to-maturity	19		19		13
Other financial assets measured at amortized cost	25		25		1
Securities available-for-sale	79		79		82
Total accrued interest receivables	296		296		205
Allowance for credit losses	0		0		1
Accrued interest receivables, net	296		296		$ 204
Charge-off of accrued interest receivables	$ 0	$ 1	$ 1	$ 3