Segment and Geographic Information (Tables)

12 Months Ended

Dec. 31, 2017

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,
	2017			2016			2015
Revenues:
National Group	$	20,772		$	19,845		$	18,756
American Group		20,912			19,670			18,875
Corporate and other		1,930			1,975			2,047
	$	43,614		$	41,490		$	39,678
Equity in earnings of affiliates:
National Group	$	(21	)	$	(20	)	$	(7	)
American Group		(37	)		(38	)		(32	)
Corporate and other		13			4			(7	)
	$	(45	)	$	(54	)	$	(46	)
Adjusted segment EBITDA:
National Group	$	4,600		$	4,565		$	4,271
American Group		4,231			4,173			4,207
Corporate and other		(598	)		(520	)		(563	)
	$	8,233		$	8,218		$	7,915
Depreciation and amortization:
National Group	$	867		$	806		$	769
American Group		986			908			885
Corporate and other		278			252			250
	$	2,131		$	1,966		$	1,904

	For the Years Ended December 31,
	2017			2016			2015
Adjusted segment EBITDA	$	8,233		$	8,218		$	7,915
Depreciation and amortization		2,131			1,966			1,904
Interest expense		1,690			1,707			1,665
Losses (gains) on sales of facilities		(8	)		(23	)		5
Losses on retirement of debt		39			4			135
Legal claim costs (benefits)		—			(246	)		249
Income before income taxes	$	4,381		$	4,810		$	3,957
	December 31,
	2017			2016			2015
Assets:
National Group	$	13,097		$	12,320		$	11,332
American Group		18,136			16,208			15,240
Corporate and other		5,360			5,230			6,172
	$	36,593		$	33,758		$	32,744

	National Group			American Group			Corporate and Other			Total
Goodwill and other intangible assets:
Balance at December 31, 2014	$	1,170		$	4,614		$	632		$	6,416
Acquisitions		318			27			—			345
Foreign currency translation, amortization and other		(7	)		(3	)		(20	)		(30	)
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