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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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Non-operating expense |  |  |  |
Total net periodic benefit cost (benefit) | $ 796 | $ (25) | $ 785 | $ (51)
Postretirement Benefits |  |  |  |
Operating expense |  |  |  |
Service cost | 5 | 6 | 12 | 12
Non-operating expense |  |  |  |
Interest cost | 21 | 23 | 43 | 45
Expected return on plan assets | (15) | (19) | (34) | (38)
Amortization of transition asset | 0 | 0 | 0 | 0
Amortization of prior service benefit | (6) | (8) | (12) | (16)
Amortization of net actuarial loss | 4 | 2 | 10 | 4
Settlements, curtailments, special termination benefits and other | 0 | 0 | 0 | 0
Total non-operating expense (benefit) | 4 | (2) | 7 | (5)
Total net periodic benefit cost (benefit) | 9 | 4 | 19 | 7
Postretirement Benefits | Continuing Operations |  |  |  |
Operating expense |  |  |  |
Service cost | 5 | 5 | 11 | 10
Non-operating expense |  |  |  |
Total non-operating expense (benefit) | 4 | (2) | 7 | (4)
Total net periodic benefit cost (benefit) | 9 | 3 | 18 | 6
Postretirement Benefits | Discontinued Operations |  |  |  |
Operating expense |  |  |  |
Service cost | 0 | 1 | 1 | 2
Non-operating expense |  |  |  |
Total non-operating expense (benefit) | 0 | 0 | 0 | (1)
Total net periodic benefit cost (benefit) | 0 | 1 | 1 | 1
United States | U.S. Pension Plans |  |  |  |
Operating expense |  |  |  |
Service cost | 29 | 43 | 66 | 86
Non-operating expense |  |  |  |
Interest cost | 141 | 165 | 301 | 331
Expected return on plan assets | (196) | (244) | (433) | (488)
Amortization of transition asset | 0 | 0 | 0 | 0
Amortization of prior service benefit | (4) | (6) | (8) | (12)
Amortization of net actuarial loss | 83 | 74 | 178 | 147
Settlements, curtailments, special termination benefits and other | 795 | 0 | 795 | 0
Total non-operating expense (benefit) | 819 | (11) | 833 | (22)
Total net periodic benefit cost (benefit) | 848 | 32 | 899 | 64
United States | U.S. Pension Plans | Continuing Operations |  |  |  |
Operating expense |  |  |  |
Service cost | 29 | 35 | 59 | 70
Non-operating expense |  |  |  |
Total non-operating expense (benefit) | 819 | (7) | 833 | (14)
Total net periodic benefit cost (benefit) | 848 | 28 | 892 | 56
United States | U.S. Pension Plans | Discontinued Operations |  |  |  |
Operating expense |  |  |  |
Service cost | 0 | 8 | 7 | 16
Non-operating expense |  |  |  |
Total non-operating expense (benefit) | 0 | (4) | 0 | (8)
Total net periodic benefit cost (benefit) | 0 | 4 | 7 | 8
International | U.S. Pension Plans |  |  |  |
Operating expense |  |  |  |
Service cost | 14 | 20 | 35 | 39
Non-operating expense |  |  |  |
Interest cost | 49 | 54 | 103 | 109
Expected return on plan assets | (80) | (75) | (167) | (150)
Amortization of transition asset | 1 | 1 | 2 | 1
Amortization of prior service benefit | 0 | 0 | 1 | 1
Amortization of net actuarial loss | 3 | 2 | 6 | 4
Settlements, curtailments, special termination benefits and other | 0 | 0 | 0 | 0
Total non-operating expense (benefit) | (27) | (18) | (55) | (35)
Total net periodic benefit cost (benefit) | (13) | 2 | (20) | 4
International | U.S. Pension Plans | Continuing Operations |  |  |  |
Operating expense |  |  |  |
Service cost | 14 | 16 | 30 | 31
Non-operating expense |  |  |  |
Total non-operating expense (benefit) | (27) | (16) | (55) | (33)
Total net periodic benefit cost (benefit) | (13) | 0 | (25) | (2)
International | U.S. Pension Plans | Discontinued Operations |  |  |  |
Operating expense |  |  |  |
Service cost | 0 | 4 | 5 | 8
Non-operating expense |  |  |  |
Total non-operating expense (benefit) | 0 | (2) | 0 | (2)
Total net periodic benefit cost (benefit) | $ 0 | $ 2 | $ 5 | $ 6

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