Annual report pursuant to Section 13 and 15(d)

LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - Credit Quality Indicators (Details)

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LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - Credit Quality Indicators (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) $ 75,404 $ 74,900
Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 30,664 30,605
Commercial Portfolio Segment [Member] | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 28,477 28,807
Commercial Portfolio Segment [Member] | OLEM    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 634 518
Commercial Portfolio Segment [Member] | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 1,551 1,269
Commercial Portfolio Segment [Member] | Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 2 11
Commercial Real Estate Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 6,674 6,842
Commercial Real Estate Portfolio Segment [Member] | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 6,487 6,586
Commercial Real Estate Portfolio Segment [Member] | OLEM    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 98 181
Commercial Real Estate Portfolio Segment [Member] | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 88 74
Commercial Real Estate Portfolio Segment [Member] | Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 1 1
Automobile Loan [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 12,797 12,429
Automobile Loan [Member] | Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 12,797 12,429
Automobile Loan [Member] | Consumer | FICO Score, Greater than 750    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 6,759 6,254
Automobile Loan [Member] | Consumer | 650-749    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 4,661 4,520
Automobile Loan [Member] | Consumer | 650    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 1,377 1,373
Automobile Loan [Member] | Consumer | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 0 282
Home Equity Loan [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 9,093 9,722
Home Equity Loan [Member] | Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 9,092 9,720
Home Equity Loan [Member] | Consumer | FICO Score, Greater than 750    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 5,763 6,098
Home Equity Loan [Member] | Consumer | 650-749    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 2,772 2,975
Home Equity Loan [Member] | Consumer | 650    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 557 591
Home Equity Loan [Member] | Consumer | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 0 56
Residential Loan [Member] | Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 11,296 10,650
Residential Loan [Member] | Consumer | FICO Score, Greater than 750    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 7,976 7,159
Residential Loan [Member] | Consumer | 650-749    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 2,742 2,801
Residential Loan [Member] | Consumer | 650    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 578 612
Residential Loan [Member] | Consumer | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 0 78
Other Consumer Loan [Member] | Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 1,237 1,320
Other Consumer Loan [Member] | Consumer | FICO Score, Greater than 750    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 546 501
Other Consumer Loan [Member] | Consumer | 650-749    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 571 633
Other Consumer Loan [Member] | Consumer | 650    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 120 129
Other Consumer Loan [Member] | Consumer | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 0 57
RV and marine finance    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 3,563 3,254
RV and marine finance | Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 3,563 3,254
RV and marine finance | Consumer | FICO Score, Greater than 750    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 2,391 2,074
RV and marine finance | Consumer | 650-749    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 1,053 990
RV and marine finance | Consumer | 650    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) 119 105
RV and marine finance | Consumer | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases (includes $81 and $79 respectively, measured at fair value)(1) $ 0 $ 85