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Debt (Recourse Debt Net Principal Amounts Due Over Five Years) (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Debt Details [Line Items] |  |
Recourse Debt Total | $ 4,671 | $ 4,966
2015 |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 0 |
2016 |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 0 |
2017 |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 240 |
2018 |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 469 |
2019 |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 966 |
Thereafter |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 3,041 |
Unamortized Discounts [Member] |  |
Debt Details [Line Items] |  |
Recourse Debt Total | $ (45) | $ (51)

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- Definition Recourse debt is direct borrowings by the Parent Company that is structurally subordinate to the affiliates non-recourse debt. + References No definition available. + Details
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