Shareholders' Equity - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	$ 1,619
Balance at end of period	649
Other comprehensive income (loss) attributable to noncontrolling interests	(20)	$ 6
Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(711)	(692)
Balance at end of period	(908)	(658)
Foreign currency translation adjustments and other:
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(369)	(395)
Other comprehensive income (loss) before reclassifications adjustments	(199)	27
Reclassification from other comprehensive income (loss)	0	0
Other comprehensive income (loss)	(199)	27
Income tax provision (benefit)	0	2
Balance at end of period	(568)	(366)
Pensions and other postretirement benefits:
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(342)	(297)
Other comprehensive income (loss) before reclassifications adjustments	0	0
Reclassification from other comprehensive income (loss)	3	1
Other comprehensive income (loss)	3	1
Income tax provision (benefit)	1	0
Balance at end of period	(338)	(296)
Cash flow hedge instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	0	0
Other comprehensive income (loss) before reclassifications adjustments	(3)	4
Reclassification from other comprehensive income (loss)	0	0
Other comprehensive income (loss)	(3)	4
Income tax provision (benefit)	1	0
Balance at end of period	$ (2)	$ 4