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Investments Accounted for Using the Equity Method and Variable Interest Entities, or VIEs (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2018 USD ($) | Sep. 30, 2019 USD ($) project MW | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Investments Accounted for by the Equity Method |  |  |  |
Equity investments in affiliates |  | $ 405 |  | $ 412
Generation capacity (in MW) | MW |  | 23,000 |  |
Loss on deconsolidation |  |  | $ 22 |
Current assets |  | $ 3 |  | 3
Net property, plant and equipment |  | 73 |  | 76
Other long-term assets |  | 28 |  | 28
Total assets |  | 104 |  | 107
Current liabilities |  | 1 |  | 2
Long-term debt |  | 28 |  | 29
Other long-term liabilities |  | 8 |  | 7
Total liabilities |  | 37 |  | 38
Redeemable noncontrolling interest |  | 19 |  | 19
Net assets less noncontrolling interest |  | 48 |  | 50
Agua Caliente |  |  |  |
Investments Accounted for by the Equity Method |  |  |  |
Equity investments in affiliates |  | 213 |  |
Ivampah Master Holdings LLC |  |  |  |
Investments Accounted for by the Equity Method |  |  |  |
Equity investments in affiliates |  | $ 28 |  |
Economic interest in equity method investments (as a percent) |  | 54.50% |  |
Number of solar electric generating projects | project |  | 3 |  |
Generation capacity (in MW) | MW |  | 393 |  |
Release of reserve funds | $ 95 |  |  |
Decrease in assets due to deconsolidation |  |  |  | $ 1,300
Decrease in liabilities due to deconsolidation |  |  | $ 1,200 |

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