Pension, Other Postretirement Benefits and Savings Plans - Funded Status Recognized in the Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Noncurrent liabilities	$ (1,470)	$ (1,334)
Pension Plan | United States
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	(11)	(16)
Noncurrent liabilities	(254)	(213)
Net amount recognized	(265)	(229)
Pension Plan | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	408	237
Current liabilities	(22)	(20)
Noncurrent liabilities	(727)	(672)
Net amount recognized	(341)	(455)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	(16)	(16)
Noncurrent liabilities	(220)	(225)
Net amount recognized	$ (236)	$ (241)