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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jul. 01, 2017 | Jun. 30, 2018 | Jul. 01, 2017
Other comprehensive income (loss), income tax benefit (expense) | $ 1 | $ 0 | $ 1 | $ (1)
Products |  |  |  |
Sales to affiliates | 343 | 270 | 649 | 529
Services |  |  |  |
Sales to affiliates | $ 3 | $ 1 | $ 5 | $ 3

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