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Leases - Components of Lease Income (Details)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
Lessor, Lease, Description [Line Items]  
Selling profit (charge) $ 14
Interest income 19
Operating lease income 24
Product revenue  
Lessor, Lease, Description [Line Items]  
Selling profit (charge) 28
Cost of product  
Lessor, Lease, Description [Line Items]  
Selling profit (charge) $ (14)