Asset Quality - Post-Modification Outstanding Recorded Investment by Concession Type for Our Commercial Accruing and Nonaccruing TDRs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total commercial and consumer TDRs	$ 11	$ 57
Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Extension of Maturity Date	0	41
Payment or Covenant Modification/Deferment	1	10
Bankruptcy Plan Modification	0	0
Increase in new commitment or new money	0	0
Total	1	51
Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Interest rate reduction	1	2
Other	9	4
Total	$ 10	$ 6