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Acquisitions, Discontinued Operations and Dispositions -Collective Collateral Facilities (Details) - USD ($) | Jan. 05, 2021 | Jul. 26, 2021 | Dec. 31, 2020
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Direct Energy |  |  |
Line of Credit Facility [Line Items] |  |  |
Revolving credit facility commitment increase | $ 3,400,000,000 |  |
Revolving Credit Facility | Revolving Credit Facility commitment increase |  |  |
Line of Credit Facility [Line Items] |  |  |
Revolving credit facility commitment increase | 802,000,000 |  |
Revolving Credit Facility | Revolving Credit Facility new tranche |  |  |
Line of Credit Facility [Line Items] |  |  |
Revolving credit facilities | 273,000,000 |  |
Revolving Credit Facility | Facility agreement in connection with the sale of pre-capitalized trust securities |  |  |
Line of Credit Facility [Line Items] |  |  |
Revolving credit facilities | 874,000,000 |  |
Revolving Credit Facility | Credit default swap facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Revolving credit facilities |  |  | $ 150,000,000
Revolving Credit Facility | Revolving accounts receivable financing facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Revolving credit facilities |  | $ 800,000,000 | 750,000,000
Revolving Credit Facility | Repurchase facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Revolving credit facilities |  |  | 75,000,000
Revolving Credit Facility | Bilateral letter of credit facilities |  |  |
Line of Credit Facility [Line Items] |  |  |
Revolving credit facilities |  |  | $ 475,000,000
Revolving Credit Facility | Total Increases to Liquidity and Collateral Facilities |  |  |
Line of Credit Facility [Line Items] |  |  |
Revolving credit facility commitment increase | $ 3,399,000,000 |  |

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