Loans and Related Allowance for Credit Losses, 90 Days or More Past Due and Still Accruing (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, 90 days or more past due and still accruing	$ 3,955	$ 5,358
Not government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, 90 days or more past due and still accruing	1,298	659
Government insured or guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, 90 days or more past due and still accruing	2,657	4,699
Total Commercial [Member] | Not government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, 90 days or more past due and still accruing	802	235
Commercial and industrial loans [Member] | Not government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, 90 days or more past due and still accruing	699	206
Real estate mortgage [Member] | Not government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, 90 days or more past due and still accruing	71	29
Real estate construction [Member] | Not government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, 90 days or more past due and still accruing	32	0
Total Consumer [Member] | Not government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, 90 days or more past due and still accruing	496	424
Residential mortgage - first lien [Member] | Not government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, 90 days or more past due and still accruing	13	37
Residential mortgage - junior lien [Member] | Not government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, 90 days or more past due and still accruing	7	12
Credit card [Member] | Not government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, 90 days or more past due and still accruing	359	269
Auto [Member] | Not government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, 90 days or more past due and still accruing	97	88
Other consumer [Member] | Not government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, 90 days or more past due and still accruing	$ 20	$ 18