Restructuring 1 (Details) $ in Millions	3 Months Ended
	Jun. 30, 2018 USD ($)
Accrued restructuring severance and exit costs activity
Accrued balance at March 31, 2018	$ 7
Accrued balance at June 30, 2018	100
Employee Severance
Accrued restructuring severance and exit costs activity
Accrued balance at March 31, 2018	0
Expense	78
Change in estimate	0
Payments	(20)
Accretion and other	2
Accrued balance at June 30, 2018	60
Facility Exit
Accrued restructuring severance and exit costs activity
Accrued balance at March 31, 2018	7
Expense	36
Change in estimate	0
Payments	(3)
Accretion and other	0
Accrued balance at June 30, 2018	$ 40