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Revenues - Contract assets and liabilities (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 29, 2018 | Sep. 29, 2018 | Dec. 31, 2017
Contract assets and liabilities |  |  |
Contract assets | $ 408 | $ 408 |
Contract liabilities | 1,100 | 1,100 |
Revenue recognized included in contract liabilities | $ 56 | $ 755 |
Effect of adoption of ASC 606 | ASC 606 |  |  |
Contract assets and liabilities |  |  |
Contract assets |  |  | $ 429
Contract liabilities |  |  | $ 1,000

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