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Debt and Finance Leases - Schedule of Long-term Debt and Capital Leases (Details) - USD ($) $ in Millions | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | May 28, 2019 | May 14, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |  |
Debt amount | $ 6,257 |  |  |  | $ 6,691
Finance leases | 0 |  |  |  | 1
Subtotal long-term debt and capital leases (including current maturities) | 6,257 |  |  |  | 6,692
Less current maturities | (302) |  |  |  | (72)
Less debt issuance costs | (68) |  |  |  | (70)
Discounts | (89) |  |  |  | (101)
Long-term debt | 5,798 |  |  |  | $ 6,449
Finance lease interest rate |  |  |  |  | 6.50%
Recourse Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt amount | 6,140 |  |  |  | $ 6,523
Recourse Debt | Senior Notes, due 2024 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt amount | $ 0 |  |  |  | 733
Interest rate, stated percentage | 6.25% | 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 | Senior Notes, due 2029 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt amount | $ 733 |  |  |  | 0
Interest rate, stated percentage | 5.25% |  |  | 5.25% |
Recourse Debt | Convertible Senior Notes, due 2048 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt amount | $ 575 |  |  |  | 575
Interest rate, stated percentage | 2.75% |  |  |  |
Recourse Debt | Senior Secured First Lien Notes, due 2024 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt amount | $ 600 |  |  |  | 0
Interest rate, stated percentage | 3.75% |  | 3.75% |  |
Recourse Debt | Senior Secured First Lien Notes, due 2029 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt amount | $ 500 |  |  |  | 0
Interest rate, stated percentage | 4.45% |  | 4.45% |  |
Recourse Debt | Term loan facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt amount | $ 0 |  |  |  | 1,698
Recourse Debt | Term loan facility | 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% |  |  |  |
Line of Credit | Revolving Credit Facility | Credit Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt amount | $ 215 |  |  |  | 0
Line of Credit | Revolving Credit Facility | Credit Agreement | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate | 1.75% |  |  |  |
Line of Credit | Revolving Credit Facility | Credit Agreement | Prime Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate | 0.75% |  |  |  |
Non Recourse Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt amount | $ 117 |  |  |  | 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 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt amount | $ 0 |  |  |  | 48
Interest rate, stated percentage | 4.39% |  |  |  |
Non Recourse Debt | Other |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt amount | $ 34 |  |  |  | $ 34

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