Statement of Consolidated Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 261	$ 470	$ 642
Other comprehensive (loss) income, net of tax (L):
Change in unrecognized net actuarial loss and prior service cost/benefit related to pension and other postretirement benefits	(46)	(388)	255
Foreign currency translation adjustments	58	(13)	(146)
Net change in unrealized gains on debt securities	0	3	(1)
Net change in unrecognized gains/losses on cash flow hedges	4	(3)	(23)
Total Other comprehensive income (loss), net of tax	16	(401)	85
Comprehensive income	$ 277	$ 69	$ 727