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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 |  |  |

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