Statement of Consolidated Comprehensive Income (unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss) attributable to common shareholders:	$ 36	$ 95	$ 155	$ 161
Other comprehensive income (loss), net of tax (J):
Change in unrecognized net actuarial loss and prior service cost (benefit) related to pension and other postretirement benefits	8	26	54	89
Foreign currency translation adjustments	48	(87)	(25)	(91)
Net change in unrealized gains on available-for-sale securities	0	1	0	4
Net change in unrecognized gains (losses) on cash flow hedges	5	1	1	(2)
Total Other comprehensive income (loss), net of tax	61	(59)	30	0
Comprehensive income	$ 97	$ 36	$ 185	$ 161