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v3.20.2

Pensions and Other Postretirement Benefits (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 10 | $ 9 | $ 30 | $ 26
Interest cost | 19 | 24 | 56 | 70
Expected return on plan assets | (48) | (45) | (143) | (134)
Amortization of net losses | 13 | 11 | 39 | 33
Amortization of prior service benefit | 0 | 0 | 0 | 0
Net benefit | (6) | (1) | (18) | (5)
Other Postretirement Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 2 | 2 | 5 | 5
Interest cost | 3 | 4 | 9 | 13
Expected return on plan assets | (4) | (4) | (10) | (11)
Amortization of net losses | 0 | 0 | 0 | 0
Amortization of prior service benefit | (6) | (6) | (19) | (18)
Net benefit | $ (5) | $ (4) | $ (15) | $ (11)

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