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Derivative Instruments and Fair Value Measurements - Assets recorded at fair value on a nonrecurring basis (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
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Fair Value Measurements, Nonrecurring | Finance group | Unobservable Inputs Level 3 |  |
Assets measured at fair value on a nonrecurring basis |  |
Impaired finance receivables, Balance | $ 26 | $ 44

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