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Revenues - Contract assets and liabilities (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 29, 2018
Dec. 31, 2017
Contract assets and liabilities      
Contract assets $ 408 $ 408  
Contract liabilities 1,100 1,100  
Revenue recognized included in contract liabilities $ 56 $ 755  
Effect of adoption of ASC 606 | ASC 606      
Contract assets and liabilities      
Contract assets     $ 429
Contract liabilities     $ 1,000