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Debt (Non-Recourse Debt Maturity Schedule) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Details [Line Items] |  |
Non-Recourse Debt | $ (321) |
Non Recourse Debt Total | 16,354 | $ 16,712
Construction line of credit facility remaining borrowing capacity | 215 |
Other line of credit remaining borrowing capacity | 868 |
Nonrecourse Debt |  |
Debt Details [Line Items] |  |
Long-Term Debt, Maturity, Year Two | 516 |
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Three | 1,017 |
Long-Term Debt, Maturity, Year Four | 1,307 |
Long-Term Debt, Maturity, Year Five | 996 |
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five | 11,400 |
Nonrecourse Debt |  |
Debt Details [Line Items] |  |
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months | $ 1,439 |

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- Definition Amount of borrowing capacity currently available under credit facilities at subsidiaries with facilities under construction (current borrowing capacity less the amount of borrowings outstanding) to fund construction and other related costs + References No definition available. + Details
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- Definition Amount of borrowing capacity currently available under credit facilities at subsidiaries (current borrowing capacity less the amount of borrowings outstanding) for general business use, including to support working capital, debt service reserves and other business needs excluding construction + References No definition available. + Details
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