Pension and Other Postretirement Benefits - Schedule of Pension and Other Postretirement Benefit Costs (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Pension | ||||
| Components of net periodic benefit cost: | ||||
| Service cost | $ 8 | $ 8 | $ 22 | $ 24 |
| Interest cost | 21 | 23 | 63 | 69 |
| Expected return on plan assets | (32) | (33) | (95) | (97) |
| Amortization of actuarial loss (gain) | 3 | 1 | 10 | 3 |
| Amortization of prior service cost | 0 | 1 | 0 | (1) |
| Settlements | 0 | 0 | 0 | 1 |
| Total net periodic benefit cost (income) | 0 | 0 | 0 | 1 |
| Other Postretirement Benefits | ||||
| Components of net periodic benefit cost: | ||||
| Service cost | 0 | 1 | 2 | 3 |
| Interest cost | 6 | 6 | 17 | 18 |
| Expected return on plan assets | (7) | (6) | (21) | (19) |
| Amortization of actuarial loss (gain) | (2) | (3) | (6) | (7) |
| Amortization of prior service cost | 0 | 0 | 0 | 0 |
| Settlements | 0 | 0 | 0 | 0 |
| Total net periodic benefit cost (income) | $ (3) | $ (2) | $ (8) | $ (5) |
| X | ||||||||||
- 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
|
| X | ||||||||||
- 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
|
| X | ||||||||||
- 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
|
| X | ||||||||||
- Definition Amount of cost recognized for passage of time related to defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- 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
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|