CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Comprehensive income:
Net income	$ 1,936	$ 1,771	$ 1,736
Pension and retiree medical benefits:
Net pension and retiree medical (losses) gains arising during the period, net of tax	(3)	(4)	5
Reclassification of losses to net income, net of tax	5	2	4
Derivative instruments:
Net fair value increase (decrease), net of tax	22	(2)	16
Reclassification of losses to net income, net of tax	2	3	5
Total other comprehensive income (loss)	26	(1)	30
Total comprehensive income	$ 1,962	$ 1,770	$ 1,766