Fair Value Measurements (Details 2) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Estimate of Fair Value Measurement
Assets and liabilities measured at fair value on a recurring basis
Fair value of long-term debt, including current portion	$ 3,109	$ 3,131
Reported Value Measurement
Assets and liabilities measured at fair value on a recurring basis
Fair value of long-term debt, including current portion	3,216	3,215
Recurring basis
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents	1,597	1,353
Nonqualified employee benefit trusts	18	18
Derivative Liability	(2)	(5)
Derivative Asset	1	1
Recurring basis | Quoted Prices in Active Markets (Level 1)
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents	1,597	1,353
Nonqualified employee benefit trusts	18	18
Derivative Liability	0	0
Derivative Asset	0	0
Recurring basis | Significant Other Observable Inputs (Level 2)
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents	0	0
Nonqualified employee benefit trusts	0	0
Derivative Liability	(2)	(5)
Derivative Asset	1	1
Recurring basis | Fair Value, Inputs (Level 3)
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents	0	0
Nonqualified employee benefit trusts	0	0
Derivative Liability	0	0
Derivative Asset	$ 0	$ 0