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Operating Lease Equipment (Tables)
 3 Months Ended
Mar. 31, 2021
Leases [Abstract]  
Undiscounted Cash Flows for Operating Leases
The following table presents undiscounted future lease payments for operating leases for the remainder of 2021 through 2026 and thereafter:
As of March 31, 2021 ($ in millions)Undiscounted
Cash Flows
Remainder of 2021$108 
2022124 
202396 
202459 
202537 
202622 
Thereafter31 
Total operating lease payments$477