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Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Schedule of Long-Term Debt
A summary of long-term debt at December 31, including related interest rates at December 31, 2020, follows (dollars in millions):
 
    
2020
    
2019
  
Senior secured asset-based revolving credit facility
   
$
—
 
   $ 2,480  
Senior secured revolving credit facility
   
 
—
 
     —  
Senior secured
364-day
term loan facility
   
 
—
 
     —  
Senior secured term loan facilities (effective interest rate of 2.8%)
   
 
3,671
 
     3,725  
Senior secured notes (effective interest rate of 5.1%)
   
 
13,850
 
     13,850  
Other senior secured debt (effective interest rate of 4.7%)
   
 
767
 
     654  
    
 
 
    
 
 
  
Senior secured debt
   
 
18,288
 
     20,709  
Senior unsecured notes (effective interest rate of 5.5%)
   
 
12,952
 
     13,252  
Net debt issuance costs
   
 
(236
) 
     (239 ) 
    
 
 
    
 
 
  
Total debt (average life of 8.9 years, rates averaging 5.0%)
   
 
31,004
 
     33,722  
Less amounts due within one year
   
 
209
 
     145  
    
 
 
    
 
 
  
    
$
30,795
 
   $ 33,577