Asset Quality - Post-Modification Outstanding Recorded Investment by Concession Type for Our Commercial Accruing and Nonaccruing TDRs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	$ 9	$ 22	$ 20	$ 60
Total commercial loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Extension of Maturity Date	0	0	0	26
Payment or Covenant Modification/Deferment	0	16	1	23
Bankruptcy Plan Modification	0	0	0	0
Increase in new commitment or new money	0	0	0	0
Total	0	16	1	49
Total consumer loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Interest rate reduction	3	2	4	4
Other	6	4	15	7
Total	$ 9	$ 6	$ 19	$ 11