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Significant Accounting Policies - Effect of Adoption of New Accounting Pronouncement, Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 24, 2018 | Mar. 25, 2018 | Dec. 31, 2017 | Sep. 24, 2017 | Jun. 25, 2017 | Mar. 26, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net earnings | $ 1,253 | $ 1,473 | $ 1,163 | $ 1,157 | $ (744) | $ 963 | $ 955 | $ 789 | $ 5,046 | $ 1,963 | $ 5,173 |
Comprehensive income |  |  |  |  |  |  |  |  | 5,672 | 1,526 | 4,515 |
Reclassification of income tax effects from tax reform |  |  |  |  |  |  |  |  | $ 2,400 |  |  |
Adjustments for | ASC 606 |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net earnings |  |  |  |  |  |  |  |  |  | (39) | $ (129) |
Comprehensive income |  |  |  |  |  |  |  |  |  | $ 38 |  |
Forecast | ASU 2016-02 |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating lease, right-of-use asset |  |  |  |  |  |  |  |  |  |  |  | $ 1,100

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