Restructuring Other Related Charges (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018 Employee	Sep. 30, 2017 USD ($)
Other Related Charges [Abstract]
Other Nonrecurring Expense		$ 7
Charges related to voluntary termination program, Expected Number of Positions Eliminated | Employee	358
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost		2
Charges related to voluntary termination program		$ 14