Consolidated Statements of Changes in Equity and Redeemable Non-Controlling Interest (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Total equity	$ 16,994	$ 16,965	$ 17,286	$ 17,146	$ 17,130	$ 17,231
Foreign currency translation adjustments
Total equity	(255)	(267)	(177)	(220)	(201)	(227)
Comprehensive income from equity method investment
Total equity	1	1	1	1	1	2
Employee benefit plans adjustments
Total equity	(67)	(67)	(67)	(90)	(90)	(90)
Accumulated other comprehensive loss
Total equity	$ (321)	$ (333)	$ (243)	$ (309)	$ (290)	$ (315)