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Supplemental Income Statement Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Supplemental Income Statement Information |  |  |  |
Interest expense | $ 85 | $ 57 | $ 255 | $ 156
Interest income | (15) | (13) | (52) | (33)
Pension and postretirement net periodic benefit cost (benefit) | (19) | (33) | (59) | (96)
Total | $ 51 | $ 11 | $ 144 | $ 27

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