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Stockholders' Equity Accumulated Other Comprehensive Income (Loss) (Table) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, beginning $ 5,073 $ 4,666
Tax benefit (expense) for items of other comprehensive income (1)  
Other comprehensive income (loss), net of tax 1 1
Balance, ending 5,147 4,773
Reclassification out of AOCI    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Tax benefit (expense) for items of other comprehensive income (1)  
Maximum | Reclassification out of AOCI    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Tax benefit (expense) for items of other comprehensive income   (1)
Benefit Plans    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, beginning (53) (28)
Amortization of prior service cost (credit) [1] 4 4
Amortization of net actuarial loss (gain) [1] (2) (3)
Tax benefit (expense) for items of other comprehensive income (1)  
Other comprehensive income (loss), net of tax 1 1
Balance, ending (52) (27)
Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, beginning (53) (28)
Amortization of prior service cost (credit) [1] 4 4
Amortization of net actuarial loss (gain) [1] (2) (3)
Tax benefit (expense) for items of other comprehensive income (1)  
Other comprehensive income (loss), net of tax 1 1
Balance, ending $ (52) $ (27)
[1] These accumulated comprehensive loss components are included in the computation of net periodic benefit cost.
See Note 11: Employee Pension and Other Postretirement Benefits. The tax expense recorded in stockholders' equity for the amounts reclassified from accumulated other comprehensive loss for the three months ended March 31, 2026 and 2025, was $1 million and less than $1 million, respectively.