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Debt (Recourse Debt Net Principal Amounts Due Over Five Years) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Details [Line Items] |  |
Recourse Debt Total | $ 3,655 | $ 4,630
Unamortized (discounts)/premiums & debt issuance (costs) |  |
Debt Details [Line Items] |  |
Recourse Debt Total | (31) |
Parent Company [Member] |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 3,655 |
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 | 505 |
Parent Company [Member] | 2021 |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 350 |
Parent Company [Member] | 2022 |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 1,213 |
Parent Company [Member] | Thereafter |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 1,608 |
Parent Company [Member] | Unamortized (discounts)/premiums & debt issuance (costs) |  |
Debt Details [Line Items] |  |
Recourse Debt Total | $ (31) | $ (40)

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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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