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Loan Portfolio - Loans by Category (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 94,646 | $ 89,552
Net loans | 93,746 | 88,669
Discontinued Operations [Member] | Education Lending [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Net loans | 865 | 1,100
Commercial Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 68,032 | 66,310
Commercial Loans [Member] | Commercial, Financial and Agricultural [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 48,295 | 45,753
Commercial Loans [Member] | Commercial Real Estate: Commercial Mortgage [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 13,491 | 14,285
Commercial Loans [Member] | Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 1,558 | 1,666
Commercial Loans [Member] | Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 15,049 | 15,951
Commercial Loans [Member] | Commercial Lease Financing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 4,688 | 4,606
Collateral for secured borrowings | 15 | 10
Commercial Loans [Member] | Commercial Credit Card [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 144 | 132
Consumer Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 26,614 | 23,242
Consumer Loans [Member] | Real Estate - Residential Mortgage [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 7,023 | 5,513
Consumer Loans [Member] | Home Equity Loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 10,274 | 11,142
Consumer Loans [Member] | Residential Prime Financing Receivables [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 17,297 | 16,655
Consumer Loans [Member] | Consumer Direct Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 3,513 | 1,809
Consumer Loans [Member] | Consumer Credit Card [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 1,130 | 1,144
Consumer Loans [Member] | Consumer Indirect Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 4,674 | $ 3,634

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