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Supplemental Income Statement Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Supplemental Income Statement Information        
Interest expense $ 88 $ 54 $ 170 $ 99
Interest income (16) (12) (37) (20)
Pension and postretirement net periodic benefit cost (benefit) (21) (31) (40) (63)
Total $ 51 $ 11 $ 93 $ 16