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Summary of Significant Accounting Policies - Securitization Proceeds (Details) - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2022 | Jun. 30, 2021
Accounting Policies [Abstract] |  |  |
Uplift securitization proceeds received from ERCOT | $ 689 | $ 689 | $ 0

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- Definition Proceeds From Government Grant + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration