Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 288	$ 335
OTHER COMPREHENSIVE LOSS:
Pension and OPEB prior service costs	(2)	(3)
Other comprehensive loss	(2)	(3)
Income tax benefits on other comprehensive loss	(1)	(1)
Other comprehensive loss, net of tax	(1)	(2)
COMPREHENSIVE INCOME	$ 287	$ 333