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Loans and Leases - Accruing And Non-Accruing Loans By Class (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	$ 58,232	$ 31,061
Allowance for loan and lease losses	963	200	$ 180	$ 189
Loans, net of unearned income	58,232	31,061
Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	57,730	30,841
Total Accruing	57,847	30,899
Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	100	36
Accruing | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	17	22
Non-Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	205	100
Total Non-Accruing	386	162
Non-Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	66	20
Non-Accruing | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	115	42
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	33,104	20,051
Loans, net of unearned income	33,104
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	33,104	20,051
Allowance for loan and lease losses	453	123	99	98
Commercial | Commercial and industrial | Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	32,945	19,968
Total Accruing	32,960	19,977
Commercial | Commercial and industrial | Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	15	7
Commercial | Commercial and industrial | Accruing | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	0	2
Commercial | Commercial and industrial | Non-Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	88	36
Total Non-Accruing	144	74
Commercial | Commercial and industrial | Non-Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	12	14
Commercial | Commercial and industrial | Non-Accruing | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	44	24
Commercial | Commercial and industrial | C&I loans, excluding PCI loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	27,700	15,614
Commercial | Commercial and industrial | C&I loans, excluding PCI loans | Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	27,541	15,533
Total Accruing	27,556	15,540
Commercial | Commercial and industrial | C&I loans, excluding PCI loans | Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	15	7
Commercial | Commercial and industrial | C&I loans, excluding PCI loans | Accruing | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	0	0
Commercial | Commercial and industrial | C&I loans, excluding PCI loans | Non-Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	88	36
Total Non-Accruing	144	74
Commercial | Commercial and industrial | C&I loans, excluding PCI loans | Non-Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	12	14
Commercial | Commercial and industrial | C&I loans, excluding PCI loans | Non-Accruing | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	44	24
Commercial | Commercial and industrial | Loans to mortgage companies
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	5,404	4,411
Loans, net of unearned income	5,400
Commercial | Commercial and industrial | Loans to mortgage companies | Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	5,404	4,411
Total Accruing	5,404	4,411
Commercial | Commercial and industrial | Loans to mortgage companies | Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	0	0
Commercial | Commercial and industrial | Loans to mortgage companies | Accruing | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	0	0
Commercial | Commercial and industrial | Loans to mortgage companies | Non-Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	0	0
Total Non-Accruing	0	0
Commercial | Commercial and industrial | Loans to mortgage companies | Non-Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	0	0
Commercial | Commercial and industrial | Loans to mortgage companies | Non-Accruing | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	0	0
Commercial | Commercial and industrial | TRUPs
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan and lease losses	18	19
Loans, net of unearned income	210	218
Commercial | Commercial and industrial | C&I Purchase Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income		26
Commercial | Commercial and industrial | C&I Purchase Credit Impaired Loans | Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing		24
Total Accruing		26
Commercial | Commercial and industrial | C&I Purchase Credit Impaired Loans | Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing		0
Commercial | Commercial and industrial | C&I Purchase Credit Impaired Loans | Accruing | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing		2
Commercial | Commercial and industrial | C&I Purchase Credit Impaired Loans | Non-Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing		0
Total Non-Accruing		0
Commercial | Commercial and industrial | C&I Purchase Credit Impaired Loans | Non-Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing		0
Commercial | Commercial and industrial | C&I Purchase Credit Impaired Loans | Non-Accruing | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing		0
Commercial | Commercial and industrial | C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	27,700	15,640
Nonaccrual, no allowance	101
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	12,275	4,337
Allowance for loan and lease losses	242	36	31	28
Commercial | Commercial real estate | Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing		4,334
Total Accruing		4,335
Commercial | Commercial real estate | Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing		1
Commercial | Commercial real estate | Accruing | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing		0
Commercial | Commercial real estate | Non-Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing		0
Total Non-Accruing		2
Commercial | Commercial real estate | Non-Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing		1
Commercial | Commercial real estate | Non-Accruing | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing		1
Commercial | Commercial real estate | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	12,275	4,332
Commercial | Commercial real estate | CRE | Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	12,194	4,329
Total Accruing	12,217	4,330
Commercial | Commercial real estate | CRE | Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	23	1
Commercial | Commercial real estate | CRE | Accruing | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	0	0
Commercial | Commercial real estate | CRE | Non-Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	10	0
Total Non-Accruing	58	2
Commercial | Commercial real estate | CRE | Non-Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	42	1
Commercial | Commercial real estate | CRE | Non-Accruing | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	6	1
Commercial | Commercial real estate | CRE Purchase Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income		5
Commercial | Commercial real estate | CRE Purchase Credit Impaired Loans | Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing		5
Total Accruing		5
Commercial | Commercial real estate | CRE Purchase Credit Impaired Loans | Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing		0
Commercial | Commercial real estate | CRE Purchase Credit Impaired Loans | Accruing | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing		0
Commercial | Commercial real estate | CRE Purchase Credit Impaired Loans | Non-Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing		0
Total Non-Accruing		0
Commercial | Commercial real estate | CRE Purchase Credit Impaired Loans | Non-Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing		0
Commercial | Commercial real estate | CRE Purchase Credit Impaired Loans | Non-Accruing | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing		0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	11,725	6,177
Consumer | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	11,725	6,177
Allowance for loan and lease losses	242	28	37	53
Loans, net of unearned income	11,725
Consumer | Consumer real estate | Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	11,474	6,048
Total Accruing	11,543	6,091
Consumer | Consumer real estate | Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	53	25
Consumer | Consumer real estate | Accruing | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	16	18
Consumer | Consumer real estate | Non-Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	106	64
Total Non-Accruing	182	86
Consumer | Consumer real estate | Non-Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	12	5
Consumer | Consumer real estate | Non-Accruing | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	64	17
Consumer | Consumer real estate | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	2,420	1,287
Consumer | Consumer real estate | HELOC | Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	2,336	1,217
Total Accruing	2,360	1,232
Consumer | Consumer real estate | HELOC | Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	13	9
Consumer | Consumer real estate | HELOC | Accruing | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	11	6
Consumer | Consumer real estate | HELOC | Non-Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	43	43
Total Non-Accruing	60	55
Consumer | Consumer real estate | HELOC | Non-Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	3	4
Consumer | Consumer real estate | HELOC | Non-Accruing | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	14	8
Consumer | Consumer real estate | RE installment loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	9,305	4,865
Consumer | Consumer real estate | RE installment loans | Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	9,138	4,812
Total Accruing	9,183	4,834
Consumer | Consumer real estate | RE installment loans | Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	40	13
Consumer | Consumer real estate | RE installment loans | Accruing | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	5	9
Consumer | Consumer real estate | RE installment loans | Non-Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	63	21
Total Non-Accruing	122	31
Consumer | Consumer real estate | RE installment loans | Non-Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	9	1
Consumer | Consumer real estate | RE installment loans | Non-Accruing | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	50	9
Consumer | Consumer real estate | RE Installment Purchase Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income		25
Consumer | Consumer real estate | RE Installment Purchase Credit Impaired Loans | Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing		19
Total Accruing		25
Consumer | Consumer real estate | RE Installment Purchase Credit Impaired Loans | Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing		3
Consumer | Consumer real estate | RE Installment Purchase Credit Impaired Loans | Accruing | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing		3
Consumer | Consumer real estate | RE Installment Purchase Credit Impaired Loans | Non-Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing		0
Total Non-Accruing		0
Consumer | Consumer real estate | RE Installment Purchase Credit Impaired Loans | Non-Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing		0
Consumer | Consumer real estate | RE Installment Purchase Credit Impaired Loans | Non-Accruing | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing		0
Consumer | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	1,128	496
Allowance for loan and lease losses	26	13	$ 13	$ 10
Loans, net of unearned income	1,128
Consumer | Credit Card and Other | Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	1,117	491
Total Accruing	1,127	496
Consumer | Credit Card and Other | Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	9	3
Consumer | Credit Card and Other | Accruing | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	1	2
Consumer | Credit Card and Other | Non-Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	1	0
Total Non-Accruing	2	0
Consumer | Credit Card and Other | Non-Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	0	0
Consumer | Credit Card and Other | Non-Accruing | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	1	0
Consumer | Credit Card and Other | Credit Card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	283	201
Consumer | Credit Card and Other | Credit Card | Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	279	199
Total Accruing	283	201
Consumer | Credit Card and Other | Credit Card | Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	3	1
Consumer | Credit Card and Other | Credit Card | Accruing | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	1	1
Consumer | Credit Card and Other | Credit Card | Non-Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	0	0
Total Non-Accruing	0	0
Consumer | Credit Card and Other | Credit Card | Non-Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	0	0
Consumer | Credit Card and Other | Credit Card | Non-Accruing | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	0	0
Consumer | Credit Card and Other | Other Consumer Loans Class
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	845	294
Consumer | Credit Card and Other | Other Consumer Loans Class | Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	838	292
Total Accruing	844	294
Consumer | Credit Card and Other | Other Consumer Loans Class | Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	6	2
Consumer | Credit Card and Other | Other Consumer Loans Class | Accruing | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	0	1
Consumer | Credit Card and Other | Other Consumer Loans Class | Non-Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	1	0
Total Non-Accruing	2	0
Consumer | Credit Card and Other | Other Consumer Loans Class | Non-Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	0	0
Consumer | Credit Card and Other | Other Consumer Loans Class | Non-Accruing | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing	$ 1	0
Consumer | Credit Card and Other | Other Purchased Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income		1
Consumer | Credit Card and Other | Other Purchased Credit Impaired Loans | Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing		0
Total Accruing		0
Consumer | Credit Card and Other | Other Purchased Credit Impaired Loans | Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing		0
Consumer | Credit Card and Other | Other Purchased Credit Impaired Loans | Accruing | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing		0
Consumer | Credit Card and Other | Other Purchased Credit Impaired Loans | Non-Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing		0
Total Non-Accruing		0
Consumer | Credit Card and Other | Other Purchased Credit Impaired Loans | Non-Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing		0
Consumer | Credit Card and Other | Other Purchased Credit Impaired Loans | Non-Accruing | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, Accruing		$ 0

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Total recorded investment in financing receivables that are current and past due and still accruing.

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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