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

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