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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

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