Pension Plans, Postretirement and Other Employee Benefits - Additional Information (Details) $ in Millions	6 Months Ended
	Jun. 30, 2017 USD ($)
US Pension
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Employer contributions	$ 12
Foreign Pension
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Employer contributions	7
Pension Plan
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Employer estimated contributions	13
Other Pension Plan
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Employer contributions	10
Non-cash contribution expense	6
US Postretirement
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Employer contributions	6
Employer estimated contributions	$ 4