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Partnerships and Joint Ventures - Variable Interest Entities (Details) - Variable Interest Entity, Not Primary Beneficiary - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Variable interest entity information |  |
Net carrying value of the unconsolidated VIEs | $ 82 | $ 174
Future funding commitment |  |
Variable interest entity information |  |
Commitment amount | $ 57 |

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