Allowance for Credit Losses - Narratives (Details) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2022 loan	Dec. 31, 2021 USD ($) loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Number of modifications resulted in the permanent reduction	0
Number of loans modified due to COVID-19		1,242
Loans modified due to COVID-19 | $		$ 172
Number of loans resumed normal scheduled payments		1,076
Loans resumed normal scheduled payments | $		$ 168
Number of loans premodified		113
Number of loans provided additional payment relief		0
Minimum
Financing Receivable, Allowance for Credit Loss [Line Items]
Period of modifications involving a reduction of stated interest rate of the loan (in years)	12 months
Period of modifications involving an extension of the maturity date (in years)	12 months
Maximum
Financing Receivable, Allowance for Credit Loss [Line Items]
Period of modifications involving a reduction of stated interest rate of the loan (in years)	5 years
Period of modifications involving an extension of the maturity date (in years)	10 years