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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