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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 703	$ 673
Other comprehensive income, before tax:
Pension and other postretirement benefits	6	11
Other comprehensive income of equity investees	6	0
Other comprehensive income, before tax	12	11
Income tax expense related to items of other comprehensive income	(4)	(3)
Other comprehensive income, net of tax	8	8
Total comprehensive income	$ 711	$ 681

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