Accumulated Other Comprehensive Loss, Excluding Noncontrolling Interests - Footnotes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign currency translation loss attributable to noncontrolling interests	$ 9	$ 11	$ 20
Foreign currency translation adjustments, net	$ 957	654	$ (799)
Consumer Healthcare JV [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign currency translation adjustments, net		1,300
Foreign currency translation gain, after-tax		$ 978