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Debt and Capital Leases - Non-Recourse Debt, Yield Notes and Project Financing (Details) - USD ($) |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
May 26, 2017 | Feb. 17, 2017 | Aug. 18, 2016 | Dec. 31, 2016 | Dec. 31, 2017
Debt Instrument |  |  |  |  |
Long-term debt |  |  |  | $ 16,704,000,000 | $ 16,633,000,000
Sun Edison Utility-Scale Solar and Wind | In-development Wind Assets |  |  |  |  |
Debt Instrument |  |  |  |  |
Non-recourse project level debt |  |  |  | 222,000,000 | 222,000,000
Non Recourse Debt |  |  |  |  |
Debt Instrument |  |  |  |  |
Long-term debt |  |  |  | 8,909,000,000 | 9,451,000,000
Revolving Credit Facility | Carlsbad Financing Agreement |  |  |  |  |
Debt Instrument |  |  |  |  |
Construction loan | $ 194,000,000 |  |  |  | 20,000,000
Revolving Credit Facility | Letter of Credit |  |  |  |  |
Debt Instrument |  |  |  |  |
Letters of credit outstanding |  |  |  |  | 29,000,000
Working capital loan facility | 83,000,000 |  |  |  |
Revolving Credit Facility | Working Capital Facility |  |  |  |  |
Debt Instrument |  |  |  |  |
Working capital loan facility | 4,000,000 |  |  |  |
NRG Yield Revolving Credit Facility |  |  |  |  |
Debt Instrument |  |  |  |  |
Amount outstanding under revolver |  |  |  |  | 55,000,000
NRG Yield Revolving Credit Facility | Letter of Credit |  |  |  |  |
Debt Instrument |  |  |  |  |
Letters of credit outstanding |  |  |  |  | $ 74,000,000
NRG Yield Operating LLC Senior Notes, due 2026 | Non Recourse Debt |  |  |  |  |
Debt Instrument |  |  |  |  |
Proceeds from issuance of senior notes |  |  | $ 350,000,000 |  |
Interest rate, stated percentage |  |  | 5.00% |  | 5.00%
Long-term debt |  |  |  | 350,000,000 | $ 350,000,000
Agua Caliente Borrower 1, due 2038 | Non Recourse Debt |  |  |  |  |
Debt Instrument |  |  |  |  |
Interest rate, stated percentage |  | 5.43% |  |  | 5.43%
Senior notes issued |  | $ 130,000,000 |  |  |
Long-term debt |  |  |  | 0 | $ 89,000,000
Carlsbad Energy Project | Non Recourse Debt |  |  |  |  |
Debt Instrument |  |  |  |  |
Proceeds from issuance of senior notes | $ 407,000,000 |  |  |  |
Interest rate, stated percentage | 4.12% |  |  |  |
Long-term debt |  |  |  | 0 | 427,000,000
Carlsbad Energy Project | Notes Payable to Banks |  |  |  |  |
Debt Instrument |  |  |  |  |
Long-term debt |  |  |  |  | 407,000,000
Utah Portfolio | Non Recourse Debt |  |  |  |  |
Debt Instrument |  |  |  |  |
Long-term debt |  |  |  | 287,000,000 | 278,000,000
Additional debt borrowed |  |  |  | 65,000,000 | $ 65,000,000
Utah Portfolio | Non Recourse Debt | LIBOR |  |  |  |  |
Debt Instrument |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  | 2.625%
NRG Energy Center Minneapolis Series D Notes | Non Recourse Debt |  |  |  |  |
Debt Instrument |  |  |  |  |
Interest rate, stated percentage |  |  |  |  | 3.55%
Senior notes issued |  |  |  | $ 125,000,000 |
NRG Energy Center Minneapolis Series D Notes | Shelf Facility |  |  |  |  |
Debt Instrument |  |  |  |  |
Long-term debt |  |  |  |  | $ 70,000,000

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