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Segment and Geographic Information (Tables)
 3 Months Ended
Mar. 31, 2019
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, 2019 and 2018 are summarized in the following table (dollars in millions):
                 
 
2019
   
2018
 
Revenues:
   
     
 
National Group
 
$
6,317
    $
5,568
 
American Group
   
5,595
     
5,327
 
Corporate and other
   
605
     
528
 
                 
 
$
12,517
    $
11,423
 
                 
Equity in earnings of affiliates:
   
     
 
National Group
 
$
(2
)
  $
(2
 )
American Group
   
(11
)
   
(9
 )
Corporate and other
   
2
     
2
 
                 
 
$
(11
)
  $
(9
 )
                 
Adjusted segment EBITDA:
   
     
 
National Group
 
$
1,454
    $
1,182
 
American Group
   
1,141
     
1,031
 
Corporate and other
   
(54
)
   
(95
 )
                 
 
$
2,541
    $
2,118
 
                 
Depreciation and amortization:
   
     
 
National Group
 
$
265
    $
225
 
American Group
   
281
     
252
 
Corporate and other
   
73
     
76
 
                 
 
$
619
    $
553
 
                 
Adjusted segment EBITDA
 
$
2,541
    $
2,118
 
Depreciation and amortization
   
619
     
553
 
Interest expense
   
461
     
431
 
Losses (gains) on sales of facilities
   
1
     
(405
 )
                 
Income before income taxes
 
$
1,460
    $
1,539