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Pension and Postretirement Benefit Plans - Components of Net Periodic Benefit Cost and Other Information (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Non-operating expense |  |
Total net periodic benefit cost (benefit) | $ 28 | $ (11)
Postretirement benefits |  |
Operating expense |  |
Service cost | 4 | 7
Non-operating expense |  |
Interest cost | 19 | 22
Expected return on plan assets | (14) | (19)
Amortization of transition asset | 0 | 0
Amortization of prior service benefit | (1) | (6)
Amortization of net actuarial loss | 5 | 6
Total non-operating expense (benefit) | 9 | 3
Total net periodic benefit cost (benefit) | 13 | 10
Service cost - continuing operations | 4 | 6
Service cost - discontinued operations | 0 | 1
Postretirement benefits | Continuing Operations |  |
Non-operating expense |  |
Total non-operating expense (benefit) - continuing operations | 9 | 3
Total net periodic benefit cost (benefit) - continuing operations | 13 | 9
Postretirement benefits | Discontinued Operations |  |
Non-operating expense |  |
Total non-operating expense (benefit) - discontinued operations | 0 | 0
Total net periodic benefit cost (benefit) - discontinued operations | 0 | 1
United States | U.S. Pension Plans |  |
Operating expense |  |
Service cost | 26 | 37
Non-operating expense |  |
Interest cost | 108 | 160
Expected return on plan assets | (142) | (237)
Amortization of transition asset | 0 | 0
Amortization of prior service benefit | 0 | (4)
Amortization of net actuarial loss | 69 | 95
Total non-operating expense (benefit) | 35 | 14
Total net periodic benefit cost (benefit) | 61 | 51
Service cost - continuing operations | 26 | 30
Service cost - discontinued operations | 0 | 7
United States | U.S. Pension Plans | Continuing Operations |  |
Non-operating expense |  |
Total non-operating expense (benefit) - continuing operations | 35 | 14
Total net periodic benefit cost (benefit) - continuing operations | 61 | 44
United States | U.S. Pension Plans | Discontinued Operations |  |
Non-operating expense |  |
Total non-operating expense (benefit) - discontinued operations | 0 | 0
Total net periodic benefit cost (benefit) - discontinued operations | 0 | 7
International | U.S. Pension Plans |  |
Operating expense |  |
Service cost | 11 | 21
Non-operating expense |  |
Interest cost | 46 | 54
Expected return on plan assets | (65) | (87)
Amortization of transition asset | 0 | 1
Amortization of prior service benefit | 1 | 1
Amortization of net actuarial loss | 2 | 3
Total non-operating expense (benefit) | (16) | (28)
Total net periodic benefit cost (benefit) | (5) | (7)
Service cost - continuing operations | 11 | 16
Service cost - discontinued operations | 0 | 5
International | U.S. Pension Plans | Continuing Operations |  |
Non-operating expense |  |
Total non-operating expense (benefit) - continuing operations | (16) | (28)
Total net periodic benefit cost (benefit) - continuing operations | (5) | (12)
International | U.S. Pension Plans | Discontinued Operations |  |
Non-operating expense |  |
Total non-operating expense (benefit) - discontinued operations | 0 | 0
Total net periodic benefit cost (benefit) - discontinued operations | $ 0 | $ 5

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