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Debt - Narrative (Details) - USD ($) | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Line of Credit Facility [Line Items] |  |
Borrowings outstanding | $ 4,024,000,000 | $ 1,732,000,000
Credit Agreement | Unsecured Revolving Credit Facility |  |
Line of Credit Facility [Line Items] |  |
Unsecured revolving credit agreement | 5,000,000,000 |
Borrowings outstanding | $ 0 |

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