Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 1,283	$ 1,079	$ 912
OTHER COMPREHENSIVE INCOME (LOSS):
Pension and OPEB prior service costs	(14)	(34)	(31)
Amortized losses on derivative hedges	1	1	2
Other comprehensive loss	(13)	(33)	(29)
Income tax benefits on other comprehensive loss	(3)	(8)	(8)
Other comprehensive loss, net of tax	(10)	(25)	(21)
COMPREHENSIVE INCOME	$ 1,273	$ 1,054	$ 891