Leases (Details 1) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease costs	$ 12
Amortization of right-of-use assets	5
Interest on lease liabilities	2
Total finance lease cost	7
Total lease cost	19
Short-term lease costs	4
Vehicles
Lessee, Lease, Description [Line Items]
Operating lease costs	7
Amortization of right-of-use assets	4
Interest on lease liabilities	1
Total finance lease cost	5
Total lease cost	12
Buildings
Lessee, Lease, Description [Line Items]
Operating lease costs	2
Amortization of right-of-use assets	0
Interest on lease liabilities	1
Total finance lease cost	1
Total lease cost	3
Other
Lessee, Lease, Description [Line Items]
Operating lease costs	3
Amortization of right-of-use assets	1
Interest on lease liabilities	0
Total finance lease cost	1
Total lease cost	$ 4