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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Comprehensive income:
Net income	$ 418	$ 380
Pension and retiree medical benefits:
Reclassifications of loss to net income, net of tax of $— and $1, respectively	0	1
Derivative instruments:
Net fair value (decrease) increase, net of tax of $(2) and $1, respectively	(5)	5
Total other comprehensive (loss) income	(4)	7
Total comprehensive income	$ 414	$ 387

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