Pension, Other Postretirement Benefits and Savings Plans - Funded Status Recognized in the Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	$ (4,817)	$ (4,955)
U.S. Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	0	0
Current liabilities	(12)	(12)
Noncurrent liabilities	(301)	(315)
Net amount recognized	(313)	(327)
Non-U.S. Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	231	249
Current liabilities	(19)	(19)
Noncurrent liabilities	(568)	(545)
Net amount recognized	(356)	(315)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	0	0
Current liabilities	(21)	(23)
Noncurrent liabilities	(269)	(265)
Net amount recognized	$ (290)	$ (288)