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Leases - Lease Amounts Included in Consolidated Income Statement (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lease income - sales-type and direct financing leases    
Sales-type lease selling price $ 1,357 $ 1,509
Less: Carrying value of underlying assets 439 591
Gross profit 917 918
Interest income on lease receivables 249 303
Total sales-type and direct financing lease income 1,166 1,221
Lease income - operating leases 260 324
Variable lease income 115 56
Total lease income $ 1,541 $ 1,601