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Debt and Capital Leases - Midwest, CVSR and Capistrano Financing (Details) - USD ($) $ in Millions | Jul. 15, 2016 | Jul. 13, 2016 | Apr. 07, 2016 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | ---
Debt Instrument |  |  |  |  |
Long-term debt |  |  |  | $ 16,633 | $ 16,704
Cedro Hill, Broken Bow, & Crofton Bluffs |  |  |  |  |
Debt Instrument |  |  |  |  |
Credit facility increased borrowing capacity |  | $ 312 |  |  |
Proceeds from lines of credit |  | $ 87 |  |  |
Non Recourse Debt |  |  |  |  |
Debt Instrument |  |  |  |  |
Long-term debt |  |  |  | $ 9,451 | 8,909
Non Recourse Debt | Midwest Generation, due 2019 |  |  |  |  |
Debt Instrument |  |  |  |  |
Interest rate, stated percentage |  |  |  | 4.39% |
Long-term debt |  |  |  | $ 152 | $ 231
Non Recourse Debt | CVSR Financing Agreement |  |  |  |  |
Debt Instrument |  |  |  |  |
Interest rate, stated percentage | 4.68% |  |  |  |
Senior notes issued | $ 200 |  |  |  |
Net proceeds from notes | $ 199 |  |  |  |
Midwest Generation | Non Recourse Debt |  |  |  |  |
Debt Instrument |  |  |  |  |
Proceeds from sale of unforced capacity |  |  | $ 253 |  |
Interest rate, stated percentage |  |  | 4.39% |  |

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