Pension and Other Postretirement Benefits (Components of Net Periodic Benefit Costs) (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
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| Pension Benefits | ||||
| Components of net periodic benefit cost: | ||||
| Service cost | $ 56 | $ 56 | $ 180 | $ 168 |
| Interest cost | 38 | 36 | 115 | 108 |
| Expected return on plan assets | (39) | (36) | (117) | (108) |
| Amortization of prior service credit | (3) | (2) | (7) | (6) |
| Amortization of actuarial loss | 3 | 4 | 12 | 12 |
| Net periodic benefit cost | 54 | 58 | 182 | 175 |
| Other Benefits | ||||
| Components of net periodic benefit cost: | ||||
| Service cost | 4 | 5 | 14 | 15 |
| Interest cost | 9 | 9 | 26 | 26 |
| Amortization of prior service credit | (5) | (5) | (16) | (16) |
| Net periodic benefit cost | $ 8 | $ 9 | $ 24 | $ 25 |
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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