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Revenues (Contract liabilities) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Contract balances |  |  |
Deferred contract revenues, recorded in other current liabilities | $ 90 | $ 203 |
Deferred contract revenues, recorded in other long-term liabilities | 408 | 422 |
Total contract liabilities | $ 498 | $ 625 | $ 625

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