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Asset Quality - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) SecurityLoan | Dec. 31, 2018 USD ($) SecurityLoan | Dec. 31, 2017 USD ($) SecurityLoan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Percentage of carrying amount of our commercial nonperforming loans outstanding | 76.00% |  |
Percentage of nonperforming loans outstanding face value | 80.00% |  |
Percentage of loans held for sale and other nonperforming assets | 88.00% |  |
Net reduction to interest income | $ 31 | $ 30 | $ 25
Interest income recognized on outstanding balances | 14 | 13 |
Commitments outstanding to lend additional funds to borrowers | 4 | 5 |
Financial receivable, modifications, subsequent default, recorded investment | 8 | 11 |
OREO | 35 | 35 |
Provision (credit) for loan and lease losses | $ 444 | $ 248 | $ 237
Commercial Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of loans | SecurityLoan | 0 | 1 | 0
Consumer Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  |  | $ 4
Number of loans | SecurityLoan | 356 | 253 | 147
Real Estate - Residential Mortgage [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financial receivable, modifications, subsequent default, recorded investment | $ 97 | $ 113 |
Continuing Operations [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Provision (credit) for loan and lease losses | 441 | 240 | $ 227
Commercial Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest income recognized on outstanding balances |  |  | 9
Commercial Loans [Member] | Continuing Operations [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Provision (credit) for loan and lease losses | 332 | 151 | 130
Consumer Loans [Member] | Continuing Operations [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Provision (credit) for loan and lease losses | 109 | 89 | 97
Consumer Loans [Member] | Continuing Operations [Member] | Real Estate - Residential Mortgage [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Provision (credit) for loan and lease losses | 1 | 1 | $ (11)
Foreclosed Residential Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
OREO | $ 34 | $ 35 |

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