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Pension and Other Postretirement Benefit Plans - Summary of Components of Net Periodic Pension Costs (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] |  |  |  |
Service cost | $ 0 | $ 1 | $ 0 | $ 3
Interest cost | 2 | 3 | 3 | 6
Expected return on plan assets | 0 | 0 | 0 | 0
Amortization: |  |  |  |
Actuarial loss | 0 | 0 | 0 | 0
Prior service credit | (12) | (2) | (23) | (4)
Settlement and curtailment (gain) loss | 0 | (4) | 0 | (4)
Net periodic benefit cost (credit) | (10) | (2) | (20) | 1
United States Pension Benefits | Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 0 | 0 | 1 | 1
Interest cost | 19 | 24 | 38 | 49
Expected return on plan assets | (40) | (41) | (79) | (82)
Amortization: |  |  |  |
Actuarial loss | 18 | 16 | 35 | 31
Prior service credit | 0 | 0 | 0 | 0
Settlement and curtailment (gain) loss | 3 | 0 | 3 | 0
Net periodic benefit cost (credit) | 0 | (1) | (2) | (1)
Foreign Pension Benefits | Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 2 | 1 | 3 | 3
Interest cost | 3 | 5 | 7 | 9
Expected return on plan assets | (8) | (7) | (17) | (15)
Amortization: |  |  |  |
Actuarial loss | 5 | 3 | 10 | 6
Prior service credit | 0 | 0 | 0 | 0
Settlement and curtailment (gain) loss | 0 | 0 | 0 | 0
Net periodic benefit cost (credit) | $ 2 | $ 2 | $ 3 | $ 3

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