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Segment and Geographic Information (Tables)
 3 Months Ended
Mar. 31, 2020
Segment Reporting [Abstract]  
Schedule of Geographic Distributions of Revenues, Equity in Earnings of Affiliates, Adjusted Segment EBITDA and Depreciation and Amortization The geographic distributions of our revenues, equity in earnings of affiliates, adjusted segment EBITDA and depreciation and amortization for the quarters ended March 31, 2020 and 2019 are summarized in the following table (dollars in millions):
                 
 
2020
 
  
2019
 
Revenues:
   
     
 
National Group
 
$
6,474
 
   $
6,317
  
American Group
 
 
5,744
 
    
5,595
  
Corporate and other
 
 
643
 
    
605
  
                 
 
$
12,861
 
   $
12,517
  
                 
Equity in earnings of affiliates:
   
     
 
National Group
 
$
1
 
   $
(2
 )
American Group
 
 
(9
)
   
(11
 )
Corporate and other
 
 
1
 
    
2
  
                 
 
$
(7
)
  $
(11
 )
                 
Adjusted segment EBITDA:
   
     
 
National Group
 
$
1,215
 
   $
1,454
  
American Group
 
 
1,115
 
    
1,141
  
Corporate and other
 
 
(130
)
   
(54
 )
                 
 
$
2,200
 
   $
2,541
  
                 
Depreciation and amortization:
   
     
 
National Group
 
$
306
 
   $
265
  
American Group
 
 
287
 
    
281
  
Corporate and other
 
 
81
 
    
73
  
                 
 
$
674
 
   $
619
  
                 
Adjusted segment EBITDA
 
$
2,200
 
   $
2,541
  
Depreciation and amortization
 
 
674
 
    
619
  
Interest expense
 
 
428
 
    
461
  
Losses (gains) on sales of facilities
 
 
(7
)
   
1
  
Losses on retirement of debt
 
 
295
 
    
—
  
                 
Income before income taxes
 
$
810
 
   $
1,460