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Operating Lease Equipment (Tables)
 6 Months Ended
Jun. 30, 2020
Leases [Abstract]  
Undiscounted Cash Flows for Operating Leases
The following table presents undiscounted future lease payments for operating leases for the remainder of 2020 through 2025 and thereafter:
As of June 30, 2020 ($ in millions)Undiscounted
Cash Flows
Remainder of 2020$78  
2021134  
2022105  
202377  
202446  
202528  
Thereafter41  
Total operating lease payments$509