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Contingencies (Details) $ in Millions | 3 Months Ended
--- | ---
Jun. 30, 2018 USD ($)
Guarantor Obligations [Line Items] |
Guarantor Exposure as percent of outstanding loans | 20.00%
Franchise lending program guarantee |
Guarantor Obligations [Line Items] |
Guarantor Obligations, Maximum Exposure | $ 27
Guarantee of Indebtedness of Others [Member] |
Guarantor Obligations [Line Items] |
Guarantor Obligations, Current Exposure | $ 11
Property Lease Guarantee [Member] |
Guarantor Obligations [Line Items] |
Year longest lease expires | 2065
Guarantor Obligations, Maximum Exposure | $ 600
Guarantee Obligations Maximum Exposure At Present Value | 500
Franchise Loan Pool Guarantees [Member] | Guarantee of Indebtedness of Others [Member] |
Guarantor Obligations [Line Items] |
Guarantor Obligations, Current Exposure | 2
Total loans outstanding | $ 11

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