Segment Information (Tables)

6 Months Ended

Jun. 30, 2021

Segment Reporting [Abstract]

Schedule of Segment Results

The following tables summarize our segment results for the three months ended June 30, 2021 and 2020, based on the segment categorization we were operating under at June 30, 2021.

	Three Months Ended June 30, 2021
	Business		Mass Markets	Total Segments	Operations and Other	Total
	(Dollars in millions)
Revenue	$	3,522	1,402	4,924	—	4,924
Expenses:
Cost of services and products	862		39	901	1,214	2,115
Selling, general and administrative	298		150	448	314	762
Less: share-based compensation	—		—	—	(42)	(42)
Total expense	1,160		189	1,349	1,486	2,835
Total adjusted EBITDA	$	2,362	1,213	3,575	(1,486)	2,089

	Three Months Ended June 30, 2020
	Business		Mass Markets	Total Segments	Operations and Other	Total
	(Dollars in millions)
Revenue	$	3,717	1,475	5,192	—	5,192
Expenses:
Cost of services and products	919		48	967	1,265	2,232
Selling, general and administrative	334		144	478	417	895
Less: share-based compensation	—		—	—	(20)	(20)
Total expense	1,253		192	1,445	1,662	3,107
Total adjusted EBITDA	$	2,464	1,283	3,747	(1,662)	2,085

The following tables summarize our segment results for the six months ended June 30, 2021 and 2020, based on the segment categorization we were operating under at June 30, 2021.

	Six Months Ended June 30, 2021
	Business		Mass Markets	Total Segments	Operations and Other	Total
	(Dollars in millions)
Revenue	$	7,117	2,836	9,953	—	9,953
Expenses:
Cost of services and products	1,743		82	1,825	2,426	4,251
Selling, general and administrative	604		283	887	631	1,518
Less: share-based compensation	—		—	—	(62)	(62)
Total expense	2,347		365	2,712	2,995	5,707
Total adjusted EBITDA	$	4,770	2,471	7,241	(2,995)	4,246

	Six Months Ended June 30, 2020
	Business		Mass Markets	Total Segments	Operations and Other	Total
	(Dollars in millions)
Revenue	$	7,454	2,966	10,420	—	10,420
Expenses:
Cost of services and products	1,826		97	1,923	2,544	4,467
Selling, general and administrative	676		284	960	788	1,748
Less: share-based compensation	—		—	—	(89)	(89)
Total expense	2,502		381	2,883	3,243	6,126
Total adjusted EBITDA	$	4,952	2,585	7,537	(3,243)	4,294

Reconciliation of Operating Profit (Loss) From Segments to Consolidated Net Income

The following table reconciles total segment adjusted EBITDA to net income:

	Three Months Ended June 30,			Six Months Ended June 30,
	2021		2020	2021	2020
	(Dollars in millions)			(Dollars in millions)
Total segment adjusted EBITDA	$	3,575	3,747	7,241	7,537
Depreciation and amortization	(1,041)		(1,162)	(2,191)	(2,322)
Other operating expenses	(1,486)		(1,662)	(2,995)	(3,243)
Stock-based compensation	(42)		(20)	(62)	(89)
Operating income	1,006		903	1,993	1,883
Total other expense, net	(332)		(390)	(687)	(937)
Income before income taxes	674		513	1,306	946
Income tax expense	168		136	325	255
Net income	$	506	377	981	691