Restructuring Other Related Charges (Details) $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($) Employee
Other Related Charges [Abstract]
Other Nonrecurring Expense	$ 7
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost	2
Charges related to voluntary termination program	$ 14
Charges related to voluntary termination program, Expected Number of Positions Eliminated | Employee	325
Charges related to voluntary termination program, Number of Positions Eliminated | Employee	255