Pensions and Other Postretirement Benefits - Estimated Future Benefit Payments (Details) $ in Millions	Dec. 31, 2025 USD ($)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
2026	$ 153
2027	150
2028	148
2029	147
2030	147
Years 2031 – 2035	737
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
2026	34
2027	28
2028	27
2029	26
2030	25
Years 2031 – 2035	$ 118