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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Non-operating expense |  |  |  |
Total net periodic benefit cost (benefit) | $ 23 | $ 796 | $ 51 | $ 785
Postretirement benefits |  |  |  |
Operating expense |  |  |  |
Service cost | 5 | 5 | 9 | 12
Non-operating expense |  |  |  |
Interest cost | 19 | 21 | 38 | 43
Expected return on plan assets | (14) | (15) | (28) | (34)
Amortization of transition asset | 0 | 0 | 0 | 0
Amortization of prior service benefit | (3) | (6) | (4) | (12)
Amortization of net actuarial loss | 3 | 4 | 8 | 10
Settlements, curtailments, special termination benefits and other | 0 | 0 | 0 | 0
Total non-operating expense (benefit) | 5 | 4 | 14 | 7
Total net periodic benefit cost (benefit) | 10 | 9 | 23 | 19
Service cost - continuing operations |  |  | 9 | 11
Service cost - discontinued operations |  |  | 0 | 1
Postretirement benefits | Continuing Operations |  |  |  |
Non-operating expense |  |  |  |
Total non-operating expense (benefit) - continuing operations |  |  | 14 | 7
Total net periodic benefit cost (benefit) - continuing operations |  |  | 23 | 18
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 | 25 | 29 | 51 | 66
Non-operating expense |  |  |  |
Interest cost | 109 | 141 | 217 | 301
Expected return on plan assets | (142) | (196) | (284) | (433)
Amortization of transition asset | 0 | 0 | 0 | 0
Amortization of prior service benefit | 0 | (4) | 0 | (8)
Amortization of net actuarial loss | 69 | 83 | 138 | 178
Settlements, curtailments, special termination benefits and other | 0 | 795 | 0 | 795
Total non-operating expense (benefit) | 36 | 819 | 71 | 833
Total net periodic benefit cost (benefit) | 61 | 848 | 122 | 899
Service cost - continuing operations |  |  | 51 | 59
Service cost - discontinued operations |  |  | 0 | 7
United States | U.S. Pension Plans | Continuing Operations |  |  |  |
Non-operating expense |  |  |  |
Total non-operating expense (benefit) - continuing operations |  |  | 71 | 833
Total net periodic benefit cost (benefit) - continuing operations |  |  | 122 | 892
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 | 13 | 14 | 24 | 35
Non-operating expense |  |  |  |
Interest cost | 46 | 49 | 92 | 103
Expected return on plan assets | (66) | (80) | (131) | (167)
Amortization of transition asset | 0 | 1 | 0 | 2
Amortization of prior service benefit | 0 | 0 | 1 | 1
Amortization of net actuarial loss | 2 | 3 | 4 | 6
Settlements, curtailments, special termination benefits and other | 0 | 0 | 0 | 0
Total non-operating expense (benefit) | (18) | (27) | (34) | (55)
Total net periodic benefit cost (benefit) | $ (5) | $ (13) | (10) | (20)
Service cost - continuing operations |  |  | 24 | 30
Service cost - discontinued operations |  |  | 0 | 5
International | U.S. Pension Plans | Continuing Operations |  |  |  |
Non-operating expense |  |  |  |
Total non-operating expense (benefit) - continuing operations |  |  | (34) | (55)
Total net periodic benefit cost (benefit) - continuing operations |  |  | (10) | (25)
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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