Impairment and Restructuring Charges (Details) $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($)
Restructuring and asset impairment charges
Restructuring Charges	$ 10
Employee Severance related costs
Restructuring and asset impairment charges
Restructuring Charges	11
Restructuring accrual
Balance in severance accrual at December 31, 2016	7
Payments made to terminated employees	(2)
Balance in severance accrual at March 31, 2017	15
Employee Severance related costs | IT transformation
Restructuring and asset impairment charges
Expected restructuring charges in 2017	1
Restructuring accrual
Reduction in expected restructuring charges in 2017	(1)
Employee Severance related costs | Argentina employee-related severance
Restructuring accrual
Restructuring charge for employee severance costs	$ 11