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Debt and Finance Leases - Senior Credit Facility and Tax Exempt Bonds (Details) - USD ($) |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
May 28, 2019 | Nov. 05, 2018 | Mar. 21, 2018 | Jan. 24, 2017 | Jun. 30, 2016 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 6,042,000,000 | $ 6,691,000,000 |
Loss on debt extinguishment |  |  |  |  |  | 51,000,000 | 44,000,000 | $ 49,000,000
Decrease to long-term debt outstanding | $ 594,000,000 |  |  |  |  |  |  |
Credit Agreement | Adjusted Base Rate | Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 1.25% |  |  |  |  |  |  |
Credit Agreement | Adjusted Base Rate | Revolving Credit Facility | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 0.75% |  |  |  |  |  |  |
Credit Agreement | Eurodollar | Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 2.25% |  |  |  |  |  |  |
Credit Agreement | Eurodollar | Revolving Credit Facility | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 1.75% |  |  |  |  |  |  |
Recourse Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | 6,008,000,000 | 6,523,000,000 |
Recourse Debt | Term Loan Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  | $ 260,000,000 |  |  | $ 1,900,000,000 | $ 0 | $ 1,698,000,000 |
Percent of face value |  |  |  |  | 99.50% |  |  |
Periodic payment, percentage of principal |  |  |  |  | 0.0025 |  |  |
Payment amount |  | 155,000,000 |  |  |  |  |  |
Loss on debt extinguishment | $ 17,000,000 | 3,000,000 |  |  |  |  |  |
Write off of deferred debt issuance cost | 13,000,000 | 2,000,000 |  |  |  |  |  |
Repayment of debt | (1,700,000,000) |  |  |  |  |  |  |
Recourse Debt | Term Loan Facility | Interest Rate Swap |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Reduction to interest expense | (25,000,000) |  |  |  |  |  |  |
Recourse Debt | Term Loan Facility | LIBOR |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  | 1.75% | 2.25% | 2.75% | 1.75% | 1.75% |
Decrease in interest rate margin |  |  | 0.50% | 0.50% |  |  |  |
Recourse Debt | Term Loan Facility | LIBOR floor |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  | 0.00% | 0.75% | 0.75% |  |  |
Recourse Debt | Indian River Power, tax exempt bonds, due 2040 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 57,000,000 | $ 57,000,000 |
Interest rate, stated percentage |  |  |  |  |  | 6.00% |  |
Recourse Debt | Indian River Power LLC, tax exempt bonds, due 2045 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 190,000,000 | 190,000,000 |
Interest rate, stated percentage |  |  |  |  |  | 5.375% |  |
Recourse Debt | Dunkirk Power LLC, tax exempt bonds, due 2042 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 59,000,000 | 59,000,000 |
Interest rate, stated percentage |  |  |  |  |  | 5.875% |  |
Recourse Debt | City of Texas City, tax exempt bonds, due 2045 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 33,000,000 | 33,000,000 |
Interest rate, stated percentage |  |  |  |  |  | 4.125% |  |
Recourse Debt | Fort Bend County, tax exempt bonds, due 2038 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 54,000,000 | 54,000,000 |
Interest rate, stated percentage |  |  |  |  |  | 4.75% |  |
Recourse Debt | Fort Bend County, tax exempt bonds, due 2042 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 73,000,000 | 73,000,000 |
Interest rate, stated percentage |  |  |  |  |  | 4.75% |  |
Recourse Debt | Tax-exempt bonds |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 466,000,000 | 466,000,000 |
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% |  |
Revolving Credit Facility | 2016 Tranche A Revolving Credit Facility due 2018 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Revolving credit facility |  |  |  |  | $ 289,000,000 |  |  |
Revolving Credit Facility | 2016 Tranche B Revolving Credit Facility due 2021 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  | 2.25% |  |  |
Revolving credit facility |  |  |  |  | $ 2,200,000,000 |  |  |
Senior Credit Facility | Term Loan Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  | $ 105,000,000 |  |  |  |  |  |
Line of Credit | Credit Agreement | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 83,000,000 | $ 0 |
Revolving credit facility | 2,600,000,000 |  |  |  |  |  |  |
Increase in revolving commitments | $ 184,000,000 |  |  |  |  |  |  |
Line of Credit | Credit Agreement | LIBOR | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  | 1.75% |  |

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