Segment Information (Tables)

3 Months Ended

Mar. 31, 2021

Segment Reporting [Abstract]

Schedule of Segment Results

The following tables summarize our segment results for the three months ended March 31, 2021 and 2020, based on the segment categorization we were operating under at March 31, 2021.

	Three Months Ended March 31, 2021
	Business		Mass Markets	Total Segments	Operations and Other	Total
	(Dollars in millions)
Revenue	$	3,595	1,434	5,029	—	5,029
Expenses:
Cost of services and products	881		43	924	1,212	2,136
Selling, general and administrative	306		133	439	317	756
Less: share-based compensation	—		—	—	(20)	(20)
Total expense	1,187		176	1,363	1,509	2,872
Total adjusted EBITDA	$	2,408	1,258	3,666	(1,509)	2,157

	Three Months Ended March 31, 2020
	Business		Mass Markets	Total Segments	Operations and Other	Total
	(Dollars in millions)
Revenue	$	3,737	1,491	5,228	—	5,228
Expenses:
Cost of services and products	907		49	956	1,279	2,235
Selling, general and administrative	342		140	482	371	853
Less: share-based compensation	—		—	—	(69)	(69)
Total expense	1,249		189	1,438	1,581	3,019
Total adjusted EBITDA	$	2,488	1,302	3,790	(1,581)	2,209

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

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

	Three Months Ended March 31,
	2021		2020
	(Dollars in millions)
Total segment adjusted EBITDA	$	3,666	3,790
Depreciation and amortization	(1,150)		(1,160)
Other operating expenses	(1,509)		(1,581)
Stock-based compensation	(20)		(69)
Operating income	987		980
Total other expense, net	(355)		(547)
Income before income taxes	632		433
Income tax expense	157		119
Net income	$	475	314