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Pension and Other Postretirement Benefits - Schedule of Obligations and Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Pension benefits |  |
Change in benefit obligation |  |
Benefit obligation at beginning of year | $ 1,599 | $ 2,296
Service cost | 3 | 4
Interest cost | 80 | 51
Amendments | 0 | 0
Actuarial losses (gains) | 50 | (553)
Settlements | (31) | (72)
Curtailments | 0 | (2)
Benefits paid | (118) | (102)
Foreign currency translation impact | 9 | (23)
Benefit obligation at end of year | 1,592 | 1,599
Change in plan assets |  |
Fair value of plan assets at beginning of year | 970 | 1,531
Actual return (loss) on plan assets | 57 | (383)
Employer contributions | 36 | 43
Benefits paid | (101) | (87)
Administrative expenses | (13) | (12)
Settlement payments | (32) | (98)
Foreign currency translation impact | 8 | (24)
Fair value of plan assets at end of year | 925 | 970
Defined Benefit Plan, Funded (Unfunded) Status of Plan: |  |
Funded status | (667) | (629)
Amounts recognized in the Consolidated Balance Sheet consist of: |  |
Noncurrent assets | 13 | 20
Current liabilities | (16) | (16)
Noncurrent liabilities | (664) | (633)
Net amount recognized | (667) | (629)
Amounts recognized in Accumulated Other Comprehensive Loss consist of: |  |
Net actuarial loss (gain) | 960 | 907
Prior service cost (benefit) | 2 | 2
Net amount recognized, before tax effect | 962 | 909
Other changes in plan assets and benefit obligations recognized in Other Comprehensive Loss consist of: |  |
Net actuarial cost (benefit) | 86 | (53)
Amortization of accumulated net actuarial (loss) benefit | (33) | (107)
Prior service benefit | 0 | (1)
Amortization of prior service benefit | 0 | 0
Net amount recognized, before tax effect | 53 | (161)
Other postretirement benefits |  |
Change in benefit obligation |  |
Benefit obligation at beginning of year | 120 | 165
Service cost | 1 | 2
Interest cost | 7 | 4
Amendments | (10) | 0
Actuarial losses (gains) | (1) | (38)
Settlements | 0 | 0
Curtailments | 0 | 0
Benefits paid | (14) | (13)
Foreign currency translation impact | 0 | 0
Benefit obligation at end of year | 103 | 120
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 | 0
Actual return (loss) on plan assets | 0 | 0
Employer contributions | 0 | 0
Benefits paid | 0 | 0
Administrative expenses | 0 | 0
Settlement payments | 0 | 0
Foreign currency translation impact | 0 | 0
Fair value of plan assets at end of year | 0 | 0
Defined Benefit Plan, Funded (Unfunded) Status of Plan: |  |
Funded status | (103) | (120)
Amounts recognized in the Consolidated Balance Sheet consist of: |  |
Noncurrent assets | 0 | 0
Current liabilities | (11) | (11)
Noncurrent liabilities | (92) | (109)
Net amount recognized | (103) | (120)
Amounts recognized in Accumulated Other Comprehensive Loss consist of: |  |
Net actuarial loss (gain) | (26) | (28)
Prior service cost (benefit) | (41) | (40)
Net amount recognized, before tax effect | (67) | (68)
Other changes in plan assets and benefit obligations recognized in Other Comprehensive Loss consist of: |  |
Net actuarial cost (benefit) | (1) | (38)
Amortization of accumulated net actuarial (loss) benefit | 3 | (1)
Prior service benefit | (10) | 0
Amortization of prior service benefit | 9 | 9
Net amount recognized, before tax effect | 1 | (30)
United States | Pension benefits |  |
Change in benefit obligation |  |
Benefit obligation at beginning of year | 1,459 |
Benefit obligation at end of year | 1,434 | 1,459
Change in plan assets |  |
Fair value of plan assets at beginning of year | 833 |
Fair value of plan assets at end of year | 780 | 833
Defined Benefit Plan, Funded (Unfunded) Status of Plan: |  |
Funded status | $ (654) | $ (626)

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