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Asset Quality - Breakdown of Nonperforming TDRs by Loans Category (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number   of Loans   | loan	4,205
Pre-modification   Outstanding   Recorded   Investment	$ 334
Post-modification   Outstanding   Recorded   Investment	$ 236
Prior-year accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number   of Loans   | loan	2,965
Pre-modification   Outstanding   Recorded   Investment	$ 156
Post-modification   Outstanding   Recorded   Investment	$ 118
Non-performing Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number   of Loans   | loan	1,240
Pre-modification   Outstanding   Recorded   Investment	$ 178
Post-modification   Outstanding   Recorded   Investment	$ 118
Total commercial loans | Prior-year accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number   of Loans   | loan	19
Pre-modification   Outstanding   Recorded   Investment	$ 0
Post-modification   Outstanding   Recorded   Investment	$ 0
Total commercial loans | Commercial and Industrial | Prior-year accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number   of Loans   | loan	19
Pre-modification   Outstanding   Recorded   Investment	$ 0
Post-modification   Outstanding   Recorded   Investment	$ 0
Total commercial loans | Commercial mortgage | Prior-year accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number   of Loans   | loan	0
Pre-modification   Outstanding   Recorded   Investment	$ 0
Post-modification   Outstanding   Recorded   Investment	$ 0
Total commercial loans | Non-performing Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number   of Loans   | loan	31
Pre-modification   Outstanding   Recorded   Investment	$ 110
Post-modification   Outstanding   Recorded   Investment	$ 58
Total commercial loans | Non-performing Loans | Commercial and Industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number   of Loans   | loan	27
Pre-modification   Outstanding   Recorded   Investment	$ 60
Post-modification   Outstanding   Recorded   Investment	$ 45
Total commercial loans | Non-performing Loans | Commercial mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number   of Loans   | loan	4
Pre-modification   Outstanding   Recorded   Investment	$ 50
Post-modification   Outstanding   Recorded   Investment	$ 13
Total commercial loans | Non-performing Loans | Total commercial real estate loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number   of Loans   | loan	4
Pre-modification   Outstanding   Recorded   Investment	$ 50
Post-modification   Outstanding   Recorded   Investment	$ 13
Total consumer loans | Prior-year accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number   of Loans   | loan	2,946
Pre-modification   Outstanding   Recorded   Investment	$ 156
Post-modification   Outstanding   Recorded   Investment	$ 118
Total consumer loans | Real estate — residential mortgage | Prior-year accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number   of Loans   | loan	425
Pre-modification   Outstanding   Recorded   Investment	$ 41
Post-modification   Outstanding   Recorded   Investment	$ 35
Total consumer loans | Home equity loans | Prior-year accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number   of Loans   | loan	1,547
Pre-modification   Outstanding   Recorded   Investment	$ 96
Post-modification   Outstanding   Recorded   Investment	$ 73
Total consumer loans | Consumer direct loans | Prior-year accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number   of Loans   | loan	272
Pre-modification   Outstanding   Recorded   Investment	$ 4
Post-modification   Outstanding   Recorded   Investment	$ 3
Total consumer loans | Credit cards | Prior-year accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number   of Loans   | loan	607
Pre-modification   Outstanding   Recorded   Investment	$ 4
Post-modification   Outstanding   Recorded   Investment	$ 2
Total consumer loans | Consumer indirect loans | Prior-year accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number   of Loans   | loan	95
Pre-modification   Outstanding   Recorded   Investment	$ 11
Post-modification   Outstanding   Recorded   Investment	$ 5
Total consumer loans | Non-performing Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number   of Loans   | loan	1,209
Pre-modification   Outstanding   Recorded   Investment	$ 68
Post-modification   Outstanding   Recorded   Investment	$ 60
Total consumer loans | Non-performing Loans | Real estate — residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number   of Loans   | loan	238
Pre-modification   Outstanding   Recorded   Investment	$ 30
Post-modification   Outstanding   Recorded   Investment	$ 27
Total consumer loans | Non-performing Loans | Home equity loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number   of Loans   | loan	468
Pre-modification   Outstanding   Recorded   Investment	$ 32
Post-modification   Outstanding   Recorded   Investment	$ 28
Total consumer loans | Non-performing Loans | Consumer direct loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number   of Loans   | loan	156
Pre-modification   Outstanding   Recorded   Investment	$ 2
Post-modification   Outstanding   Recorded   Investment	$ 2
Total consumer loans | Non-performing Loans | Credit cards
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number   of Loans   | loan	331
Pre-modification   Outstanding   Recorded   Investment	$ 2
Post-modification   Outstanding   Recorded   Investment	$ 2
Total consumer loans | Non-performing Loans | Consumer indirect loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number   of Loans   | loan	16
Pre-modification   Outstanding   Recorded   Investment	$ 2
Post-modification   Outstanding   Recorded   Investment	$ 1

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