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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Comprehensive income:      
Net income $ 1,771 $ 1,736 $ 1,597
Pension and retiree medical benefits:      
Net pension and retiree medical (losses) gains arising during the period, net of tax (4) 5 0
Reclassification of losses to net income, net of tax 2 4 8
Derivative instruments:      
Net fair value (decrease) increase, net of tax (2) 16 4
Reclassification of losses to net income, net of tax 3 5 6
Total other comprehensive (loss) income (1) 30 18
Total comprehensive income $ 1,770 $ 1,766 $ 1,615