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Debt (Non-Recourse Debt Carrying Amounts and Terms) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |
Construction Line Of Credit Facility Remaining Borrowing Capacity |  | $ 470 |  |
Gain (Loss) on Extinguishment of Debt |  | (169) | $ (188) | $ (68)
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net |  | (318) | (368) |
Non-recourse Debt, excluding Finance Lease Liabilities |  | 16,712 |  |
Non-Recourse Debt |  |  | 15,645 |
Non-recourse Debt Current Maturities | [1] | (1,865) |  |
Non-Recourse Debt, Current Balance | [1] |  | 1,659 |
Non-recourse Debt, excluding Finance Lease Liabilities, Noncurrent | [1] | 14,847 |  |
Derivative, notional amount |  | 1,800 |  |
Other Line Of Credit Facility Remaining Borrowing Capacity |  | $ 1,100 |  |
Non-Recourse Debt, Noncurrent Balance | [1] |  | 13,986 |
Variable Rate Debt | Bank loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted Average Interest Rate |  | 4.25% |  |
Non-Recourse Debt |  | $ 3,389 | 2,600 |
Variable Rate Debt | Notes and bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted Average Interest Rate |  | 3.99% |  |
Non-Recourse Debt |  | $ 1,056 | 821 |
Variable Rate Debt | Debt to (or guaranteed by) multilateral, export credit agencies or development banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted Average Interest Rate | [2] | 1.73% |  |
Non-Recourse Debt | [2] | $ 460 | 3,292 |
Fixed Rate Debt | Bank loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted Average Interest Rate |  | 5.19% |  |
Non-Recourse Debt |  | $ 2,900 | 1,684 |
Fixed Rate Debt | Notes and bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted Average Interest Rate |  | 5.51% |  |
Non-Recourse Debt |  | $ 8,098 | 7,346 |
Fixed Rate Debt | Debt to (or guaranteed by) multilateral, export credit agencies or development banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted Average Interest Rate | [2] | 6.09% |  |
Non-Recourse Debt | [2] | $ 1,110 | 246 |
Fixed Rate Debt | Other |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted Average Interest Rate |  | 4.20% |  |
Non-Recourse Debt |  | $ 17 | $ 24 |
[1] | Excludes $3 million (current) and $67 million (noncurrent) finance lease liabilities included in the respective non-recourse debt line items on the Consolidated Balance Sheet as of December 31, 2019. See Note 14—Leases for further information.
[2] | Multilateral loans include loans funded and guaranteed by bilaterals, multilaterals, development banks and other similar institutions.

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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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