Benefit Obligations - Schedule of Net Periodic Benefit Costs Recognized (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
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| Pension Benefits | ||||
| Defined Benefit Plan Disclosure [Line Items] | ||||
| Service cost | $ 2 | $ 3 | $ 5 | $ 7 |
| Interest cost | 28 | 31 | 55 | 60 |
| Expected return on plan assets | (33) | (32) | (65) | (64) |
| Amortization of prior service cost (credit) | 1 | 0 | 1 | 0 |
| Total | (4) | 2 | (6) | 3 |
| Post-retirement Benefits | ||||
| Defined Benefit Plan Disclosure [Line Items] | ||||
| Service cost | 0 | 0 | 0 | 0 |
| Interest cost | 1 | 0 | 1 | 1 |
| Expected return on plan assets | 0 | 0 | 0 | 0 |
| Amortization of prior service cost (credit) | 0 | 0 | 0 | 0 |
| Total | $ 1 | $ 0 | $ 1 | $ 1 |
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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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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- 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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