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Revenue - Impact of Adjustments in Contract Estimates (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenue $ 9,555 $ 9,186 $ 18,816 $ 16,721
Operating earnings 1,090 1,088 2,104 2,096
Accounting Standards Update 2014-09        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenue 72 91 168 206
Operating earnings $ 71 $ 83 $ 139 $ 180
Diluted earnings per share $ 0.19 $ 0.22 $ 0.38 $ 0.47