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Leases - Components of Lease Income (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sales-type leases:    
Selling profit $ 48 $ 20
Interest income 76 33
Operating lease income $ 257 $ 36
Sales-type Lease, Income, Comprehensive Income [Extensible List] us-gaap:Revenues us-gaap:Revenues
Product revenue    
Sales-type leases:    
Selling profit $ 106 $ 48
Cost of product    
Sales-type leases:    
Selling profit $ (58) $ (28)