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Leases - Components of Lease Income (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Lessor, Lease, Description [Line Items]    
Selling profit (charge) $ 13 $ 14
Interest income 19 19
Operating lease income 71 24
Product revenue    
Lessor, Lease, Description [Line Items]    
Selling profit (charge) 30 28
Cost of product    
Lessor, Lease, Description [Line Items]    
Selling profit (charge) $ (17) $ (14)