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Operating Lease Equipment (Tables)
 12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Undiscounted Cash Flows for Operating Leases
The following table presents undiscounted future lease payments for operating leases for 2021 through 2025 and thereafter:
As of December 31, 2020 ($ in millions)Undiscounted
Cash Flows
2021$143 
2022119 
202391 
202455 
202534 
Thereafter51 
Total operating lease payments$493