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Retirement-Related Benefits - Contributions (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2025 | Jun. 30, 2024
Retirement-Related Benefits |  |
Total plan contributions | $ 124 | $ 150
Trust for Benefit of Employees |  |
Retirement-Related Benefits |  |
Contributions by employer - Noncash | 390 | 390
U.S. nonpension postretirement benefit plan |  |
Retirement-Related Benefits |  |
Total plan contributions | 104 | 110
Non-U.S. DB plans and multi-employer plans |  |
Retirement-Related Benefits |  |
Total plan contributions | $ 20 | $ 40

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