Segment Information (Details 2) $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($) category	Mar. 31, 2016 USD ($)
Operating revenues by products and services
Number of categories of products and services (categories) | category	4
Revenues	$ 4,209	$ 4,401
Surcharge amount on customers' bills	130	146
Strategic services
Operating revenues by products and services
Revenues	2,000	1,989
IT and managed services
Operating revenues by products and services
Revenues	$ 152	162
Facilities-based video services
Operating revenues by products and services
Number of markets	16
Legacy services
Operating revenues by products and services
Revenues	$ 1,803	1,988
Data integration
Operating revenues by products and services
Revenues	118	116
IT and managed services data integration
Operating revenues by products and services
Revenues	1	0
Other revenues
Operating revenues by products and services
Revenues	288	308
High cost support revenue
Operating revenues by products and services
Revenues	168	174
Other revenue
Operating revenues by products and services
Revenues	120	134
Enterprise
Operating revenues by products and services
Revenues	2,356	2,442
Enterprise | Enterprise high-bandwidth data services
Operating revenues by products and services
Revenues	769	738
Enterprise | Other enterprise strategic services
Operating revenues by products and services
Revenues	315	315
Enterprise | Voice services
Operating revenues by products and services
Revenues	573	622
Enterprise | Enterprise low-bandwidth data services
Operating revenues by products and services
Revenues	314	365
Enterprise | Other enterprise legacy services
Operating revenues by products and services
Revenues	268	287
Enterprise | Data integration
Operating revenues by products and services
Revenues	117	115
Consumer
Operating revenues by products and services
Revenues	1,412	1,489
Consumer | Consumer broadband services
Operating revenues by products and services
Revenues	661	667
Consumer | Other consumer strategic services
Operating revenues by products and services
Revenues	103	107
Consumer | Voice services
Operating revenues by products and services
Revenues	575	634
Consumer | Other consumer legacy services
Operating revenues by products and services
Revenues	73	80
Consumer | Data integration
Operating revenues by products and services
Revenues	$ 0	1
Enterprise low-bandwidth data services | Restatement adjustment | Enterprise | Strategic services
Operating revenues by products and services
Revenues		(365)
Enterprise low-bandwidth data services | Restatement adjustment | Enterprise | Legacy services
Operating revenues by products and services
Revenues		365
Other enterprise legacy services | Restatement adjustment | Enterprise | Strategic services
Operating revenues by products and services
Revenues		1
Other enterprise legacy services | Restatement adjustment | Enterprise | Legacy services
Operating revenues by products and services
Revenues		$ (1)