Pension, Savings and Other Postretirement Benefit Plans - Textual (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Defined contribution savings plan, contribution expense recognized	$ 29	$ 31	$ 63	$ 64
Postretirement benefits credit	(7)	(6)	(13)	(10)
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension cost	25	$ 25	37	$ 46
Contributions to pension plans	14		31
Minimum | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to funded pension plans in current year			50
Maximum | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to funded pension plans in current year			$ 75
Scenario, Forecast | Change in Assumptions for Pension Plans | Minimum
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension cost					$ (50)
Scenario, Forecast | Change in Assumptions for Pension Plans | Maximum
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension cost					$ (75)
United Kingdom | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Settlement of benefit obligation	41
Settlement charge	$ 14