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Loans and Leases - Balances Of Commercial Loan Portfolio Classes, Disaggregated By PD Grade and Sub 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]
Loan balance	$ 57,269	$ 30,861
Loans and Leases Receivable, Allowance	963	200
Allowance for loan and lease losses	963	$ 200	$ 180	$ 189
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of total commercial loans (percent)		100.00%
Loans and Leases Receivable, Allowance		$ 159
Collectively evaluated for impairment		$ 24,273
Percent loan collectively evaluated for impairment		100.00%
Charge-offs		$ 152
Individually evaluated for impairment		$ 84
Percent loan individually evaluated for impairment		0.00%
Allowance for credit losses, individually evaluated for impairment		$ 6
Purchased credit-impaired loans		$ 31
Percent loan purchased credit impaired		0.00%
Allowance - purchased credit-impaired loans		$ 1
Total commercial loans		24,388
Commercial | C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan and lease losses	453	123	99	98
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan and lease losses	242	36	$ 31	$ 28
C&I | Commercial | C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for impairment		15,532
Individually evaluated for impairment		82
Purchased credit-impaired loans		26
Total commercial loans		15,640
Loans to mortgage companies | Commercial | C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for impairment		4,411
Individually evaluated for impairment		0
Purchased credit-impaired loans		0
Total commercial loans		4,411
CRE | Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for impairment		4,330
Individually evaluated for impairment		2
Purchased credit-impaired loans		5
Total commercial loans		4,337
TRUPs | Commercial | C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan and lease losses	$ 18	19
PD Grades 1 - 12 | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan balance		$ 23,699
Percent of total commercial loans (percent)		98.00%
Loans and Leases Receivable, Allowance		$ 114
PD Grades 1 - 12 | C&I | Commercial | C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan balance		15,036
PD Grades 1 - 12 | Loans to mortgage companies | Commercial | C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan balance		4,411
PD Grades 1 - 12 | CRE | Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan balance		4,252
PD Grades 13 | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan balance		$ 267
Percent of total commercial loans (percent)		1.00%
Loans and Leases Receivable, Allowance		$ 8
PD Grades 13 | C&I | Commercial | C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan balance		233
PD Grades 13 | Loans to mortgage companies | Commercial | C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan balance		0
PD Grades 13 | CRE | Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan balance		34
PD Grades 14 15 16 | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan balance		$ 307
Percent of total commercial loans (percent)		1.00%
Loans and Leases Receivable, Allowance		$ 30
PD Grades 14 15 16 | C&I | Commercial | C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan balance		263
PD Grades 14 15 16 | Loans to mortgage companies | Commercial | C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan balance		0
PD Grades 14 15 16 | CRE | Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan balance		$ 44

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The recorded balance for loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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