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Operating Lease Equipment (Tables)
12 Months Ended
Dec. 31, 2019
Leases Operating [Abstract]  
Undiscounted Future Lease Payments of Operating Leases
The following table presents undiscounted future lease payments for operating leases for the years ending December 31:
   
As of December 31, 2019 ($ in millions)
 
Undiscounted Cash    
Flows    
 
   
2020
  $
152
 
2021
   
124
 
2022
   
94
 
2023
   
67
 
2024
   
38
 
Thereafter
   
63
 
   
Total operating lease payments
  $
538