Loans and Leases - Information By Class Related To Individually Impaired Loans (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Recorded Investment
Recorded Investment	$ 247
Unpaid Principal Balance
Unpaid Principal Balance	281
Related Allowance	26
Average Recorded Investment
Average Recorded Investment	270
Interest Income Recognized
Interest Income Recognized	6
Commercial
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	54
Recorded Investment	84
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	65
Unpaid Principal Balance	97
Related Allowance	6
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	72
Average Recorded Investment	89
Interest Income Recognized
Impaired loans with no related allowance recorded, Interest income recognized	1
Interest Income Recognized	1
Consumer
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	12
Impaired loans with related allowance recorded, Recorded investment	151
Recorded Investment	163
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	20
Impaired loans with related allowance recorded, Unpaid principal balance	164
Unpaid Principal Balance	184
Related Allowance	20
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	15
Impaired loans with related allowance recorded, Average recorded investment	166
Average Recorded Investment	181
Interest Income Recognized
Impaired loans with no related allowance recorded, Interest income recognized	0
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized	5
Interest Income Recognized	5
Commercial and industrial | Commercial | C&I
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	53
Impaired loans with related allowance recorded, Recorded investment	30
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	64
Impaired loans with related allowance recorded, Unpaid principal balance	32
Related Allowance	6
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	61
Impaired loans with related allowance recorded, Average recorded investment	17
Interest Income Recognized
Impaired loans with no related allowance recorded, Interest income recognized	1
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized	0
Commercial and industrial | Commercial | Loans to mortgage companies
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	0
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	0
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	9
Interest Income Recognized
Impaired loans with no related allowance recorded, Interest income recognized	0
Commercial real estate | Commercial | CRE
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	1
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	1
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	2
Interest Income Recognized
Impaired loans with no related allowance recorded, Interest income recognized	0
Consumer real estate | Consumer | HELOC
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	5
Impaired loans with related allowance recorded, Recorded investment	56
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	10
Impaired loans with related allowance recorded, Unpaid principal balance	59
Related Allowance	7
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	7
Impaired loans with related allowance recorded, Average recorded investment	61
Interest Income Recognized
Impaired loans with no related allowance recorded, Interest income recognized	0
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized	2
Consumer real estate | Consumer | RE installment loans
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	7
Impaired loans with related allowance recorded, Recorded investment	94
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	10
Impaired loans with related allowance recorded, Unpaid principal balance	104
Related Allowance	13
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	8
Impaired loans with related allowance recorded, Average recorded investment	104
Interest Income Recognized
Impaired loans with no related allowance recorded, Interest income recognized	0
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized	3
Credit card and other | Consumer
Recorded Investment
Impaired loans with related allowance recorded, Recorded investment	1
Unpaid Principal Balance
Impaired loans with related allowance recorded, Unpaid principal balance	1
Related Allowance	0
Average Recorded Investment
Impaired loans with related allowance recorded, Average recorded investment	1
Interest Income Recognized
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized	$ 0