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Supplemental Income Statement Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Other Income and Expenses [Abstract]          
Interest expense $ 117   $ 128 $ 370 $ 388
Interest income (6)   (5) (18) (24)
Pension and postretirement net periodic benefit cost (benefit) (80)   (40) (239) (116)
Total $ 31   $ 83 $ 113 $ 248
Fixed rate medium term note due 2022          
Debt instrument          
Loss on extinguishment of debt   $ 11