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Pension and Other Postretirement Benefit Plans - Net Periodic Costs Recognized in Operating Profit and Interest and Sundry (Income) Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Other Postretirement Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic benefit cost | $ (10) | $ (2) | $ (20) | $ 1
Operating profit (loss) | Other Postretirement Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic benefit cost | 0 | 1 | 0 | 3
Interest and sundry (income) expense | Other Postretirement Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic benefit cost | (10) | (3) | (20) | (2)
United States Pension Benefits | Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic benefit cost | 0 | (1) | (2) | (1)
United States Pension Benefits | Operating profit (loss) | Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic benefit cost | 0 | 0 | 1 | 1
United States Pension Benefits | Interest and sundry (income) expense | Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic benefit cost | 0 | (1) | (3) | (2)
Foreign Pension Benefits | Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic benefit cost | 2 | 2 | 3 | 3
Foreign Pension Benefits | Operating profit (loss) | Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic benefit cost | 2 | 1 | 3 | 3
Foreign Pension Benefits | Interest and sundry (income) expense | Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic benefit cost | $ 0 | $ 1 | $ 0 | $ 0

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