Loans and Related Allowance for Credit Losses (Nonperforming Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Nonperforming loans, without allowance for credit losses	$ 900	$ 1,000
Nonperforming loans
Nonperforming loans	2,068	2,480
OREO and foreclosed assets	33	26
Total nonperforming assets	$ 2,101	$ 2,506
Nonperforming loans to total loans	0.66%	0.86%
Nonperforming assets to total loans, OREO and foreclosed assets	0.67%	0.87%
Nonperforming assets to total assets	0.38%	0.45%
Total commercial | Nonperforming loans
Nonperforming loans	$ 903	$ 1,168
Total consumer | Nonperforming loans
Nonperforming loans	$ 1,165	$ 1,312
Unsecured Consumer Loans | Minimum
Threshold period of financing receivable past due, writeoff	120 days
Unsecured Consumer Loans | Maximum
Threshold period of financing receivable past due, writeoff	180 days