Statement of Consolidated Comprehensive (Loss) Income (unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ (121)	$ 120	$ 66	$ 263
Other comprehensive (loss) income, net of tax (J):
Change in unrecognized net actuarial loss and prior service cost/benefit related to pension and other postretirement benefits	23	29	63	172
Foreign currency translation adjustments	(30)	(201)	(4)	(79)
Net change in unrealized gains on available-for-sale securities	0	(2)	3	(2)
Net change in unrecognized gains/losses on cash flow hedges	(10)	4	(3)	(3)
Total Other comprehensive (loss) income, net of tax	(17)	(170)	59	88
Comprehensive (loss) income	$ (138)	$ (50)	$ 125	$ 351