Employee Benefit Plans - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($)
International Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Contributions by Employer	$ 5
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year	25
Defined Benefit Plan Estimated Total Employer Contributions in Current Fiscal Year	30
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Contributions by Employer	1
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year	2
Defined Benefit Plan Estimated Total Employer Contributions in Current Fiscal Year	3
Postemployment Benefit Plans Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Contributions by Employer	5
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year	50
Defined Benefit Plan Estimated Total Employer Contributions in Current Fiscal Year	$ 55