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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 30, 2016
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 3,143 | $ 3,129 | $ 3,102 | $ 2,876 | $ 2,863 | $ 2,743 | $ 2,933 | $ 2,869 | $ 12,250 | $ 11,408 | $ 11,069
Operating Income | 1,249 | 1,293 | 1,283 | 1,044 | 1,126 | 868 | 957 | 769 | 4,869 | 3,720 | 3,413
Net Earnings | $ 843 | $ 894 | $ 877 | $ 695 | $ 4,140 | $ 459 | $ 510 | $ 362 | $ 3,309 | $ 5,471 | $ 1,714
Earnings Per Share, Basic (in dollars per share) | $ 1.02 | $ 1.05 | $ 1.02 | $ 0.78 | $ 4.63 | $ 0.51 | $ 0.55 | $ 0.39 | $ 3.86 | $ 6.01 | $ 1.81
Earnings Per Share, Assuming Dilution (in dollars per share) | $ 1.01 | $ 1.05 | $ 1.01 | $ 0.78 | $ 4.62 | $ 0.51 | $ 0.55 | $ 0.39 | $ 3.84 | $ 5.99 | $ 1.81
Effect of change in tax rate |  |  |  |  | $ 3,600 |  |  |  |  | $ 3,600 |
Effect of change in tax rate (in dollars per share) |  |  |  |  | $ 3.91 |  |  |  |  | $ 3.91 |

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