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Leases - Operating Lease Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Lessee, Lease, Description [Line Items]    
Operating lease costs $ 11 $ 35
Amortization of right-of-use assets 4 13
Interest on lease liabilities 0 4
Total finance lease cost 4 17
Total lease cost 15 52
Short-term lease costs 2 8
Vehicles    
Lessee, Lease, Description [Line Items]    
Operating lease costs 5 20
Amortization of right-of-use assets 4 12
Interest on lease liabilities 0 2
Total finance lease cost 4 14
Total lease cost 9 34
Buildings    
Lessee, Lease, Description [Line Items]    
Operating lease costs 3 6
Amortization of right-of-use assets 0 0
Interest on lease liabilities 0 2
Total finance lease cost 0 2
Total lease cost 3 8
Other    
Lessee, Lease, Description [Line Items]    
Operating lease costs 3 9
Amortization of right-of-use assets 0 1
Interest on lease liabilities 0 0
Total finance lease cost 0 1
Total lease cost $ 3 $ 10