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Fair Value of Financial Information - Schedule of Measurements of Assets and Liabilities on Recurring Basis (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Assets:    
Restricted funds $ 41 $ 44
Rabbi trust investments 32 29
Deposits 124 6
Mark-to-market derivative asset $ 2 $ 24
Mark-to-market derivative asset [Extensible Enumeration Not Disclosed Flag] Mark-to-market derivative asset Mark-to-market derivative asset
Total assets $ 254 $ 218
Liabilities:    
Deferred compensation obligations 38 34
Total liabilities 38 34
Total assets 216 184
Fixed-income securities    
Assets:    
Other investments 35 94
Money market and other    
Assets:    
Other investments 20 21
Level 1    
Assets:    
Restricted funds 41 44
Rabbi trust investments 32 29
Deposits 124 6
Mark-to-market derivative asset 0 0
Total assets 245 188
Liabilities:    
Deferred compensation obligations 38 34
Total liabilities 38 34
Total assets 207 154
Level 1 | Fixed-income securities    
Assets:    
Other investments 28 88
Level 1 | Money market and other    
Assets:    
Other investments 20 21
Level 2    
Assets:    
Restricted funds 0 0
Rabbi trust investments 0 0
Deposits 0 0
Mark-to-market derivative asset 2 24
Total assets 9 30
Liabilities:    
Deferred compensation obligations 0 0
Total liabilities 0 0
Total assets 9 30
Level 2 | Fixed-income securities    
Assets:    
Other investments 7 6
Level 2 | Money market and other    
Assets:    
Other investments 0 0
Level 3    
Assets:    
Restricted funds 0 0
Rabbi trust investments 0 0
Deposits 0 0
Mark-to-market derivative asset 0 0
Total assets 0 0
Liabilities:    
Deferred compensation obligations 0 0
Total liabilities 0 0
Total assets 0 0
Level 3 | Fixed-income securities    
Assets:    
Other investments 0 0
Level 3 | Money market and other    
Assets:    
Other investments $ 0 $ 0