Segment and Geographic Information (Tables)

12 Months Ended

Dec. 31, 2018

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, depreciation and amortization, assets and goodwill and other intangible assets are summarized in the following table (dollars in millions):

	For the Years Ended December 31,
	2018			2017			2016
Revenues:
National Group	$	22,581		$	20,772		$	19,845
American Group		21,959			20,912			19,670
Corporate and other		2,137			1,930			1,975
	$	46,677		$	43,614		$	41,490
Equity in earnings of affiliates:
National Group	$	(4	)	$	(21	)	$	(20	)
American Group		(40	)		(37	)		(38	)
Corporate and other		15			13			4
	$	(29	)	$	(45	)	$	(54	)
Adjusted segment EBITDA:
National Group	$	4,980		$	4,600		$	4,565
American Group		4,593			4,231			4,173
Corporate and other		(624	)		(598	)		(520	)
	$	8,949		$	8,233		$	8,218
Depreciation and amortization:
National Group	$	946		$	867		$	806
American Group		1,027			986			908
Corporate and other		305			278			252
	$	2,278		$	2,131		$	1,966

	For the Years Ended December 31,
	2018			2017			2016
Adjusted segment EBITDA	$	8,949		$	8,233		$	8,218
Depreciation and amortization		2,278			2,131			1,966
Interest expense		1,755			1,690			1,707
Gains on sales of facilities		(428	)		(8	)		(23	)
Losses on retirement of debt		9			39			4
Legal claim benefits		—			—			(246	)
Income before income taxes	$	5,335		$	4,381		$	4,810
	December 31,
	2018			2017			2016
Assets:
National Group	$	14,839		$	13,097		$	12,320
American Group		19,122			18,136			16,208
Corporate and other		5,246			5,360			5,230
	$	39,207		$	36,593		$	33,758

	National Group			American Group			Corporate and Other			Total
Goodwill and other intangible assets:
Balance at December 31, 2015	$	1,481		$	4,638		$	612		$	6,731
Acquisitions		—			33			8			41
Foreign currency translation, amortization and other		(23	)		(10	)		(35	)		(68	)
Balance at December 31, 2016		1,458			4,661			585			6,704
Acquisitions		19			612			62			693
Foreign currency translation, amortization and other		(3	)		(8	)		8			(3	)
Balance at December 31, 2017		1,474			5,265			655			7,394
Acquisitions		132			504			—			636
Foreign currency translation, amortization and other		(9	)		(40	)		(28	)		(77	)
Balance at December 31, 2018	$	1,597		$	5,729		$	627		$	7,953