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Revenues (Contract liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Contract balances      
Deferred contract revenues, recorded in other current liabilities $ 100 $ 87  
Deferred contract revenues, recorded in other long-term liabilities 429 399  
Total contract liabilities $ 529 $ 486 $ 625