Employee Benefit Plans - Narrative (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2017 USD ($)
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year	$ 2	$ 2
Defined Benefit Plan Estimated Total Employer Contributions in Current Fiscal Year	3	3
Defined Benefit Plan, Plan Assets, Contributions by Employer	0	1
Postemployment Retirement Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year	13	13
Defined Benefit Plan Estimated Total Employer Contributions in Current Fiscal Year	35	35
Defined Benefit Plan, Plan Assets, Contributions by Employer	8	22
Foreign Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year	15	15
Defined Benefit Plan Estimated Total Employer Contributions in Current Fiscal Year	30	30
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 6	$ 15