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Equity (Issuance of Stock and Forward Sale Agreement) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Jun. 30, 2021 | Dec. 31, 2020
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NEP [Member] |  |  |
Class of Stock [Line Items] |  |  |
Senior unsecured convertible notes outstanding | $ 500 | $ 500 | $ 600

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