Variable Interest Entities Affordable Housing Tax Credit Investments (Details) - Variable Interest Entity, Not Primary Beneficiary [Member] - Low Income Housing Tax Credit Investments [Member] - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Affordable housing tax credit investments included in other assets	$ 1,238	$ 1,045
Unfunded affordable housing tax credit commitments included in other liabilities	511	348
Loans and letters of credit commitments	598	410
Funded portion of loans and letters of credit commitments	282	148
Tax credits and other tax benefits recognized	180	165	$ 164
Tax credit amortization expense included in provision for income taxes	$ 149	$ 139	$ 133

Variable Interest Entities Affordable Housing Tax Credit Investments (Details) - Variable Interest Entity, Not Primary Beneficiary [Member] - Low Income Housing Tax Credit Investments [Member] - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2022

Dec. 31, 2021

Dec. 31, 2020

Variable Interest Entity [Line Items]

Affordable housing tax credit investments included in other assets

$ 1,238

$ 1,045

Unfunded affordable housing tax credit commitments included in other liabilities

511

348

Loans and letters of credit commitments