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Leases - Components of Lease Income (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Lessor, Lease, Description [Line Items]    
Selling profit (charge) $ 8 $ 8
Interest income 15 15
Operating lease income 14 14
Product revenue    
Lessor, Lease, Description [Line Items]    
Selling profit (charge) 21 21
Cost of product    
Lessor, Lease, Description [Line Items]    
Selling profit (charge) $ (13) $ (13)