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Partnerships and Joint Ventures - Ownership and Receivables (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Partnership | Majority |  |
Variable interest entity information |  |
Entity's interest in partnership or joint venture (as a percent) | 50.00% |
Joint ventures | Majority |  |
Variable interest entity information |  |
Entity's interest in partnership or joint venture (as a percent) | 50.00% |
Unconsolidated variable interest entities | Accounts and notes receivable, net |  |
Variable interest entity information |  |
Receivables related to work performed for unconsolidated partnerships and joint ventures | $ 83 | $ 392
Notes receivable | $ 22 |
Unconsolidated variable interest entities | Other assets |  |
Variable interest entity information |  |
Notes receivable |  | $ 19

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