Employee Benefit Plans - Narrative (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)
International Pension Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Contributions by Employer	$ 7	$ 20
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year		15
Defined Benefit Plan Estimated Total Employer Contributions in Current Fiscal Year	35	35
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	0	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	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	11	32
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year		1
Defined Benefit Plan Estimated Total Employer Contributions in Current Fiscal Year	$ 33	$ 33