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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Nonperforming Loans and Leases by Class (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonperforming loans | $ 845 | $ 871
Loans accruing and 90 days or more past due | 26 | 32
GNMA |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonperforming loans sold with right to repurchase | 23 | 30
Residential mortgages |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans accruing and 90 days or more past due | 11 | 15
Commercial | Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonperforming loans | 249 | 238
Loans accruing and 90 days or more past due | 3 | 5
Commercial | Commercial real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonperforming loans | 31 | 27
Loans accruing and 90 days or more past due | 0 | 3
Commercial | Leases |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonperforming loans | 0 | 0
Loans accruing and 90 days or more past due | 0 | 0
Commercial | Commercial Banking |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonperforming loans | 280 | 265
Loans accruing and 90 days or more past due | 3 | 8
Retail | Residential mortgages |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonperforming loans | 119 | 128
Loans accruing and 90 days or more past due | 14 | 16
Retail | Home equity loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonperforming loans | 59 | 72
Loans accruing and 90 days or more past due | 0 | 0
Retail | Home equity lines of credit |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonperforming loans | 225 | 233
Loans accruing and 90 days or more past due | 0 | 0
Retail | Home equity loans serviced by others |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonperforming loans | 19 | 25
Loans accruing and 90 days or more past due | 0 | 0
Retail | Home equity lines of credit serviced by others |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonperforming loans | 17 | 18
Loans accruing and 90 days or more past due | 0 | 0
Retail | Automobile |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonperforming loans | 62 | 70
Loans accruing and 90 days or more past due | 0 | 0
Retail | Education |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonperforming loans | 40 | 38
Loans accruing and 90 days or more past due | 3 | 3
Retail | Credit cards |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonperforming loans | 17 | 17
Loans accruing and 90 days or more past due | 0 | 0
Retail | Other retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonperforming loans | 7 | 5
Loans accruing and 90 days or more past due | 6 | 5
Retail | Retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonperforming loans | 565 | 606
Loans accruing and 90 days or more past due | $ 23 | $ 24

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