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Equity (Issuance of Stock and Forward Sale Agreement) (Details) $ in Millions |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 26, 2020 shares | Sep. 14, 2020 shares | Nov. 30, 2017 USD ($) | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 shares | Dec. 31, 2018 shares | Dec. 31, 2017 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |
Antidilutive securities (in shares) | shares |  |  |  | 27,100,000 | 3,000,000.0 | 500,000 |
Common stock, authorized (in shares) | shares | 3,200,000,000 | 800,000,000 |  | 3,200,000,000 | 3,200,000,000 |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio | 4 | 4 |  |  |  |  |
NEP [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Senior unsecured convertible notes outstanding | $ |  |  |  | $ 600 |  |  | $ 300
Series A Convertible Preferred Units [Member] | NEP [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock sold during the period | $ |  |  | $ 550 |  |  |  |

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