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Loans and Related Allowance for Credit Losses (Financial Impact and TDRs by Concession Type) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) loan	Dec. 31, 2021 USD ($) loan	Dec. 31, 2020 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	10,866	6,166	12,343
Pre-TDR Amortized Cost Basis	$ 525	$ 644	$ 691
Post-TDR Amortized Cost Basis	414	613	602
Principal Forgiveness
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-TDR Amortized Cost Basis	9	6	39
Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-TDR Amortized Cost Basis	181	64	144
Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-TDR Amortized Cost Basis	$ 224	$ 543	$ 419
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	57	57	73
Pre-TDR Amortized Cost Basis	$ 363	$ 536	$ 513
Post-TDR Amortized Cost Basis	269	516	441
Commercial | Principal Forgiveness
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-TDR Amortized Cost Basis	9	6	39
Commercial | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-TDR Amortized Cost Basis	58		56
Commercial | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-TDR Amortized Cost Basis	$ 202	$ 510	$ 346
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	10,809	6,109	12,270
Pre-TDR Amortized Cost Basis	$ 162	$ 108	$ 178
Post-TDR Amortized Cost Basis	145	97	161
Consumer | Principal Forgiveness
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-TDR Amortized Cost Basis
Consumer | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-TDR Amortized Cost Basis	123	64	88
Consumer | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-TDR Amortized Cost Basis	$ 22	$ 33	$ 73

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Financing Receivable, Troubled Debt Restructuring, Postmodification, Amortized Cost

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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