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Debt (Recourse Debt Net Principal Amounts Due Over Five Years) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Details [Line Items] |  |
Recourse Debt Total | $ 3,396 | $ 3,655
Unamortized (discounts)/premiums & debt issuance (costs) |  |
Debt Details [Line Items] |  |
Recourse Debt Total | (22) |
Parent Company [Member] |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 3,396 |
Parent Company [Member] | Debt Maturity Year One [Member] |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 5 |
Parent Company [Member] | Debt Maturity Year Two [Member] |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 505 |
Parent Company [Member] | Debt Maturity Year Three [Member] |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 8 |
Parent Company [Member] | Debt Maturity Year Four [Member] |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 1,113 |
Parent Company [Member] | Debt Maturity Year Five [Member] |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 243 |
Parent Company [Member] | Thereafter |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 1,544 |
Parent Company [Member] | Unamortized (discounts)/premiums & debt issuance (costs) |  |
Debt Details [Line Items] |  |
Recourse Debt Total | $ (22) | $ (31)

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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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