Changes in Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	$ 1,916
Other comprehensive income (loss), net of tax	(29)	$ (156)	$ 123
Balance at end of period	1,619	1,916
Other comprehensive income (loss) attributable to noncontrolling interests, net of tax	(10)	(2)	2
Foreign currency translation adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(395)	(263)	(367)
Other comprehensive income (loss) before reclassifications	23	(134)	104
Income tax provision (benefit)	3	2	0
Other comprehensive income (loss), net of tax	26	(132)	104
Balance at end of period	(369)	(395)	(263)
Pension and postretirement benefits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(297)	(275)	(292)
Other comprehensive income (loss) before reclassifications	(46)	(47)	2
Reclassification to earnings	7	22	26
Other comprehensive income (loss) before tax	(39)	(25)	28
Income tax provision (benefit)	(6)	3	(11)
Other comprehensive income (loss), net of tax	(45)	(22)	17
Balance at end of period	(342)	(297)	(275)
Cash flow hedging instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	0
Other comprehensive income (loss) before reclassifications	1
Reclassification to earnings	(1)
Other comprehensive income (loss) before tax	0
Balance at end of period	0	0
Cash flow hedging instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	0	0	0
Other comprehensive income (loss) before reclassifications		0	0
Reclassification to earnings		0	0
Other comprehensive income (loss) before tax		0	0
Balance at end of period		0	0
Accumulated other comprehensive loss at end of year
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(692)	(538)	(659)
Balance at end of period	$ (711)	$ (692)	$ (538)