Pension, Savings and Other Postretirement Benefit Plans - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Defined contribution savings plan, contribution expense recognized	$ 30	$ 34
Postretirement benefits credit	2	$ 6
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Contributions to pension plans	14
Non-U.S. | Minimum
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to funded pension plans in current year	50
Non-U.S. | Maximum
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to funded pension plans in current year	$ 75