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Acquisitions and Dispositions - Collective Collateral Facilities (Details) - Revolving Credit Facility - USD ($) $ in Millions |  | 6 Months Ended |
--- | --- | --- | ---
Jan. 05, 2021 | Jan. 05, 2021 | Dec. 31, 2020
Revolving Credit Facility commitment increase |  |  |
Line of Credit Facility [Line Items] |  |  |
Revolving Credit Facility increases | $ 802 |  |
Revolving Credit Facility new tranche |  |  |
Line of Credit Facility [Line Items] |  |  |
Credit facility borrowing available | 273 | $ 273 |
Facility agreement in connection with the sale of pre-capitalized trust securities |  |  |
Line of Credit Facility [Line Items] |  |  |
Credit facility borrowing available | $ 874 | 874 |
Credit default swap facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Credit facility borrowing available |  |  | $ 150
Revolving accounts receivable financing facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Credit facility borrowing available |  |  | 750
Repurchase facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Credit facility borrowing available |  |  | 75
Bilateral letter of credit facilities |  |  |
Line of Credit Facility [Line Items] |  |  |
Credit facility borrowing available |  |  | $ 475
Total Increases to Liquidity and Collateral Facilities |  |  |
Line of Credit Facility [Line Items] |  |  |
Revolving Credit Facility increases |  | $ 3,399 |

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