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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Non-operating expense |  |  |  |
Total net periodic benefit cost (benefit) | $ 7 | $ (26) | $ 792 | $ (77)
Postretirement Benefits |  |  |  |
Operating expense |  |  |  |
Service cost | 5 | 6 | 17 | 18
Non-operating expense |  |  |  |
Interest cost | 20 | 21 | 63 | 66
Expected return on plan assets | (15) | (20) | (49) | (58)
Amortization of transition asset | 0 | 0 | 0 | 0
Amortization of prior service benefit | (6) | (7) | (18) | (23)
Amortization of net actuarial loss | 5 | 2 | 15 | 6
Settlements, curtailments, special termination benefits and other | 0 | 0 | 0 | 0
Total non-operating expense (benefit) | 4 | (4) | 11 | (9)
Total net periodic benefit cost (benefit) | 9 | 2 | 28 | 9
Postretirement Benefits | Continuing Operations |  |  |  |
Operating expense |  |  |  |
Service cost | 5 | 5 | 16 | 15
Non-operating expense |  |  |  |
Total non-operating expense (benefit) | 4 | (3) | 11 | (7)
Total net periodic benefit cost (benefit) | 9 | 2 | 27 | 8
Postretirement Benefits | Discontinued Operations |  |  |  |
Operating expense |  |  |  |
Service cost | 0 | 1 | 1 | 3
Non-operating expense |  |  |  |
Total non-operating expense (benefit) | 0 | (1) | 0 | (2)
Total net periodic benefit cost (benefit) | 0 | 0 | 1 | 1
United States | U.S. Pension Plans |  |  |  |
Operating expense |  |  |  |
Service cost | 28 | 42 | 94 | 128
Non-operating expense |  |  |  |
Interest cost | 110 | 166 | 411 | 497
Expected return on plan assets | (140) | (243) | (573) | (731)
Amortization of transition asset | 0 | 0 | 0 | 0
Amortization of prior service benefit | (3) | (6) | (11) | (18)
Amortization of net actuarial loss | 64 | 73 | 242 | 220
Settlements, curtailments, special termination benefits and other | 0 | 0 | 795 | 0
Total non-operating expense (benefit) | 31 | (10) | 864 | (32)
Total net periodic benefit cost (benefit) | 59 | 32 | 958 | 96
United States | U.S. Pension Plans | Continuing Operations |  |  |  |
Operating expense |  |  |  |
Service cost | 28 | 34 | 87 | 104
Non-operating expense |  |  |  |
Total non-operating expense (benefit) | 31 | (6) | 864 | (20)
Total net periodic benefit cost (benefit) | 59 | 28 | 951 | 84
United States | U.S. Pension Plans | Discontinued Operations |  |  |  |
Operating expense |  |  |  |
Service cost | 0 | 8 | 7 | 24
Non-operating expense |  |  |  |
Total non-operating expense (benefit) | 0 | (4) | 0 | (12)
Total net periodic benefit cost (benefit) | 0 | 4 | 7 | 12
International | U.S. Pension Plans |  |  |  |
Operating expense |  |  |  |
Service cost | 15 | 21 | 50 | 60
Non-operating expense |  |  |  |
Interest cost | 50 | 56 | 153 | 165
Expected return on plan assets | (81) | (76) | (248) | (226)
Amortization of transition asset | 0 | 1 | 2 | 2
Amortization of prior service benefit | 0 | 0 | 1 | 1
Amortization of net actuarial loss | 3 | 2 | 9 | 6
Settlements, curtailments, special termination benefits and other | 0 | 0 | 0 | 0
Total non-operating expense (benefit) | (28) | (17) | (83) | (52)
Total net periodic benefit cost (benefit) | (13) | 4 | (33) | 8
International | U.S. Pension Plans | Continuing Operations |  |  |  |
Operating expense |  |  |  |
Service cost | 15 | 17 | 45 | 48
Non-operating expense |  |  |  |
Total non-operating expense (benefit) | (28) | (17) | (83) | (50)
Total net periodic benefit cost (benefit) | (13) | 0 | (38) | (2)
International | U.S. Pension Plans | Discontinued Operations |  |  |  |
Operating expense |  |  |  |
Service cost | 0 | 4 | 5 | 12
Non-operating expense |  |  |  |
Total non-operating expense (benefit) | 0 | 0 | 0 | (2)
Total net periodic benefit cost (benefit) | $ 0 | $ 4 | $ 5 | $ 10

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