Loans and Related Allowance for Credit Losses, Defaulted Troubled Debt Restructurings (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded investment of defaults	$ 56	$ 27	$ 203	$ 224
Total Commercial [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded investment of defaults	4	6	66	157
Commercial and industrial loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded investment of defaults	1	4	53	129
Real estate mortgage [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded investment of defaults	3	2	13	27
Real estate construction [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded investment of defaults	0	0	0	0
Lease financing [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded investment of defaults	0	0	0	1
Total Consumer [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded investment of defaults	52	21	137	67
Residential mortgage - first lien [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded investment of defaults	32	4	88	9
Residential mortgage - junior lien [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded investment of defaults	4	0	6	1
Credit card [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded investment of defaults	12	5	25	21
Auto [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded investment of defaults	4	11	17	34
Other consumer [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded investment of defaults	$ 0	$ 1	$ 1	$ 2