Loans and Related Allowance for Credit Losses, Unfunded Credit Commitments (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded credit commitments	$ 693,898	$ 686,721
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]
Financing receivable, temporary advance arrangements	89,300
Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded credit commitments	441,533	419,620
Commercial and industrial loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded credit commitments	409,832	388,162
Real estate mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded credit commitments	9,524	11,515
Real estate construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded credit commitments	22,177	19,943
Total Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded credit commitments	252,365	267,101
Residential mortgage - first lien [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded credit commitments	21,662	32,992
Residential mortgage - junior lien [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded credit commitments	22,744	27,447
Credit card [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded credit commitments	142,519	130,743
Other consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded credit commitments	65,440	75,919
International [Member] | Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]
Letters of credit outstanding, amount	$ 1,300	$ 1,500