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Progress Collections and Deferred Income (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Jan. 01, 2017
Disaggregation of Revenue [Line Items]            
Progress collections and deferred income (contract liabilities) (1) $ 1,630   $ 1,630   $ 1,775 $ 2,038
Revenue recognized, included in contract liability 404 $ 506 1,006 $ 1,035    
Progress collections            
Disaggregation of Revenue [Line Items]            
Progress collections and deferred income (contract liabilities) (1) 1,466   1,466   1,456  
Deferred income            
Disaggregation of Revenue [Line Items]            
Progress collections and deferred income (contract liabilities) (1) $ 164   $ 164   $ 319