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Supplemental Income Statement Information (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Supplemental Income Statement Information |  |
Interest expense | $ 104 | $ 82
Interest income | (20) | (21)
Pension and postretirement net periodic benefit cost (benefit) | (36) | (19)
Total | $ 48 | $ 42

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