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Debt (Recourse Debt Net Principal Amounts Due Over Five Years) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Debt Details [Line Items] |  |
Recourse Debt Total | $ 4,630 | $ 4,671
Unamortized (discounts)/premiums & debt issuance (costs) |  |
Debt Details [Line Items] |  |
Recourse Debt Total | (40) |
Parent Company [Member] |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 4,630 |
Parent Company [Member] | 2018 |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 5 |
Parent Company [Member] | 2019 |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 5 |
Parent Company [Member] | 2020 |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 234 |
Parent Company [Member] | 2021 |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 902 |
Parent Company [Member] | 2022 |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 500 |
Parent Company [Member] | Thereafter |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 3,024 |
Parent Company [Member] | Unamortized (discounts)/premiums & debt issuance (costs) |  |
Debt Details [Line Items] |  |
Recourse Debt Total | $ (40) | $ (45)

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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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