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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Comprehensive income:        
Net income $ 288 $ 328 $ 706 $ 708
Pension and retiree medical benefits:        
Reclassifications of loss to net income, net of tax of $—, $—, $— and $1, respectively 1 1 1 2
Derivative instruments:        
Net fair value increase, net of tax of $5, $4, $3 and $6, respectively 13 11 8 16
Reclassification of losses to net income, net of tax of $—, $—, $1 and $1, respectively 1 1 2 2
Total other comprehensive income 15 13 11 20
Total comprehensive income $ 303 $ 341 $ 717 $ 728