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Debt (Recourse Debt Net Principal Amounts Due Over Five Years) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Details [Line Items] |  |
Recourse Debt Total | $ 3,447 | $ 3,396
Debt Maturity Year One [Member] |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 1 |
Debt Maturity Year Two [Member] |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 3 |
Debt Maturity Year Three [Member] |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 3 |
Debt Maturity Year Four [Member] |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 74 |
Debt Maturity Year Five [Member] |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 903 |
Thereafter |  |
Debt Details [Line Items] |  |
Recourse Debt Total | 2,504 |
Unamortized (discounts)/premiums & debt issuance (costs) |  |
Debt Details [Line Items] |  |
Recourse Debt Total | $ (41) |

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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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