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Segment and Geographic Information (Tables)
 3 Months Ended
Mar. 31, 2021
Segment Reporting [Abstract]  
Schedule of Geographic Distributions of Revenues, Equity in Earnings of Affiliates, Adjusted Segment EBITDA, Depreciation and Amortization, Assets and Goodwill and other intangible assets.
The geographic distributions of our revenues, equity in earnings of affiliates, adjusted segment EBITDA and depreciation and amortization for the quarters ended March 31, 2021 and 2020 are summarized in the following table (dollars in millions):
 
 
  
202
1
 
  
2020
 
Revenues:
  
      
  
      
National Group
  
$
7,056
 
  
$
6,474
 
American Group
  
 
6,291
 
  
 
5,744
 
Corporate and other
  
 
630
 
  
 
643
 
    
 
 
     
 
 
  
 
  
$
13,977
 
  
$
12,861
 
    
 
 
     
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
2021
 
 
 
2020
 
Equity in earnings of affiliates:
  
 
 
 
  
 
 
 
National Group
  
$
(7
) 
  
$
1
 
American Group
  
 
(12
) 
  
 
(9
) 
Corporate and other
  
 
(2
) 
  
 
1
 
 
  
$
(21
) 
  
$
(7
) 
 
  
 
 
 
  
 
 
 
Adjusted segment EBITDA:
  
 
 
 
  
 
 
 
National Group
  
$
1,705
 
  
$
1,215
 
American Group
  
 
1,501
 
  
 
1,115
 
Corporate and other
  
 
(154
) 
  
 
(130
) 
 
  
$
3,052
 
  
$
2,200
 
 
  
 
 
 
  
 
 
 
Depreciation and amortization:
  
 
 
 
  
 
 
 
National Group
  
$
323
 
  
$
306
 
American Group
  
 
293
 
  
 
287
 
Corporate and other
  
 
81
 
  
 
81
 
 
  
$
697
 
  
$
674
 
 
  
 
 
 
  
 
 
 
Adjusted segment EBITDA
  
$
3,052
 
  
$
2,200
 
Depreciation and amortization
  
 
697
 
  
 
674
 
Interest expense
  
 
384
 
  
 
428
 
Gains on sales of facilities
  
 
(2
) 
  
 
(7
) 
Losses on retirement of debt
  
 
—
 
  
 
295
 
Income before income taxes
  
$
1,973
 
  
$
810