Loans and Related Allowance for Credit Losses (Financial Impact and TDRs by Concession Type) (Details) $ in Millions	12 Months Ended
Dec. 31, 2022 USD ($) customer	Dec. 31, 2021 USD ($) customer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| customer	10,866	6,166
Pre-TDR Recorded Investment	$ 525	$ 644
Post-TDR Recorded Investment	414	613
Principal Forgiveness
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-TDR Recorded Investment	9	6
Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-TDR Recorded Investment	181	64
Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-TDR Recorded Investment	$ 224	$ 543
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| customer	57	57
Pre-TDR Recorded Investment	$ 363	$ 536
Post-TDR Recorded Investment	269	516
Commercial \| Principal Forgiveness
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-TDR Recorded Investment	9	6
Commercial \| Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-TDR Recorded Investment	58
Commercial \| Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-TDR Recorded Investment	$ 202	$ 510
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| customer	10,809	6,109
Pre-TDR Recorded Investment	$ 162	$ 108
Post-TDR Recorded Investment	145	97
Consumer \| Principal Forgiveness
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-TDR Recorded Investment
Consumer \| Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-TDR Recorded Investment	123	64
Consumer \| Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-TDR Recorded Investment	$ 22	$ 33

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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