Pension, Other Postretirement Benefits and Savings Plans - Funded Status Recognized in the Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Noncurrent liabilities	$ (1,334)	$ (1,345)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	0	0
Current liabilities	(16)	(17)
Noncurrent liabilities	(225)	(214)
Net amount recognized	(241)	(231)
United States | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	0	0
Current liabilities	(16)	(20)
Noncurrent liabilities	(213)	(269)
Net amount recognized	(229)	(289)
Non-U.S. | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	237	325
Current liabilities	(20)	(20)
Noncurrent liabilities	(672)	(615)
Net amount recognized	$ (455)	$ (310)