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Debt (Recourse Debt Net Principal Amounts Due Over Five Years) (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Debt Details [Line Items] |  |
Recourse Debt Total | $ 5,015 | $ 5,258
2015 |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 0 |
2016 |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 181 |
2017 |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 0 |
2018 |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 774 |
2019 |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 469 |
Thereafter |  |
Debt Details [Line Items] |  |
Recourse Debt Total | $ 3,591 |

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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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