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Leases - Components of Lease Income (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Lessor, Lease, Description [Line Items]  
Selling profit (charge) $ 20
Interest income 33
Operating lease income 36
Product revenue  
Lessor, Lease, Description [Line Items]  
Selling profit (charge) 48
Cost of product  
Lessor, Lease, Description [Line Items]  
Selling profit (charge) $ (28)