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Debt and Capital Leases - Schedule of Long-term Debt and Capital Leases (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |
Debt amount | $ 6,656 | $ 6,691
Capital leases | 1 | 1
Subtotal long-term debt and capital leases (including current maturities) | 6,657 | 6,692
Less current maturities | (124) | (72)
Less debt issuance costs | (69) | (70)
Discounts | (98) | (101)
Total long-term debt and capital leases | 6,366 | 6,449
Recourse Debt |  |
Debt Instrument [Line Items] |  |
Debt amount | 6,519 | 6,523
Recourse Debt | Senior Notes, due 2024 |  |
Debt Instrument [Line Items] |  |
Debt amount | $ 733 | 733
Interest rate, stated percentage | 6.25% |
Recourse Debt | Senior Notes, due 2026 |  |
Debt Instrument [Line Items] |  |
Debt amount | $ 1,000 | 1,000
Interest rate, stated percentage | 7.25% |
Recourse Debt | Senior Notes, due 2027 |  |
Debt Instrument [Line Items] |  |
Debt amount | $ 1,230 | 1,230
Interest rate, stated percentage | 6.625% |
Recourse Debt | Senior Notes, due 2028 |  |
Debt Instrument [Line Items] |  |
Debt amount | $ 821 | 821
Interest rate, stated percentage | 5.75% |
Recourse Debt | Convertible Senior Notes, due 2048 |  |
Debt Instrument [Line Items] |  |
Debt amount | $ 575 | 575
Interest rate, stated percentage | 2.75% |
Recourse Debt | Term loan facility, due 2023 |  |
Debt Instrument [Line Items] |  |
Debt amount | $ 1,694 | 1,698
Recourse Debt | Term loan facility, due 2023 | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.75% |
Recourse Debt | Tax-exempt bonds |  |
Debt Instrument [Line Items] |  |
Debt amount | $ 466 | 466
Recourse Debt | Tax-exempt bonds | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 4.125% |
Recourse Debt | Tax-exempt bonds | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 6.00% |
Non Recourse Debt |  |
Debt Instrument [Line Items] |  |
Debt amount | $ 137 | 168
Non Recourse Debt | Agua Caliente Borrower 1, due 2038 |  |
Debt Instrument [Line Items] |  |
Debt amount | $ 83 | 86
Interest rate, stated percentage | 5.43% |
Non Recourse Debt | Midwest Generation, due 2019 |  |
Debt Instrument [Line Items] |  |
Debt amount | $ 20 | 48
Interest rate, stated percentage | 4.39% |
Non Recourse Debt | Other |  |
Debt Instrument [Line Items] |  |
Debt amount | $ 34 | $ 34

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