Segment Information (Details 2) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) category	Sep. 30, 2014 USD ($)
Operating revenues by products and services
Number of categories of products and services (categories) | category			4
OPERATING REVENUES	$ 4,554	$ 4,514	$ 13,424	$ 13,593
Surcharge amount on customers' bills	137	128	411	395
Strategic services
Operating revenues by products and services
OPERATING REVENUES	$ 2,319	2,302	$ 6,971	6,862
Strategic services | Restatement adjustment
Operating revenues by products and services
OPERATING REVENUES		(8)		(27)
Facilities-based video services
Operating revenues by products and services
Number of markets	16		16
Legacy services
Operating revenues by products and services
OPERATING REVENUES	$ 1,673	1,777	$ 5,095	5,428
Legacy services | Restatement adjustment
Operating revenues by products and services
OPERATING REVENUES		8		27
Data integration
Operating revenues by products and services
OPERATING REVENUES	153	185	434	546
Other revenues
Operating revenues by products and services
OPERATING REVENUES	409	250	924	757
High cost support revenue
Operating revenues by products and services
OPERATING REVENUES	284	134	550	400
Other revenue
Operating revenues by products and services
OPERATING REVENUES	125	116	374	357
Business
Operating revenues by products and services
OPERATING REVENUES	2,636	2,773	7,992	8,336
Business | Business high-bandwidth data services
Operating revenues by products and services
OPERATING REVENUES	699	655	2,083	1,904
Business | Business low-bandwidth data services
Operating revenues by products and services
OPERATING REVENUES	506	574	1,555	1,792
Business | Business hosting services
Operating revenues by products and services
OPERATING REVENUES	324	331	961	988
Business | Other business strategic services
Operating revenues by products and services
OPERATING REVENUES	27	30	113	55
Business | Voice services
Operating revenues by products and services
OPERATING REVENUES	638	692	1,958	2,103
Business | Other business legacy services
Operating revenues by products and services
OPERATING REVENUES	290	307	890	951
Business | Data integration
Operating revenues by products and services
OPERATING REVENUES	152	184	432	543
Consumer
Operating revenues by products and services
OPERATING REVENUES	1,509	1,491	4,508	4,500
Consumer | Consumer high-speed Internet services
Operating revenues by products and services
OPERATING REVENUES	658	616	1,945	1,847
Consumer | Other consumer strategic services
Operating revenues by products and services
OPERATING REVENUES	105	96	314	276
Consumer | Voice services
Operating revenues by products and services
OPERATING REVENUES	664	707	2,027	2,170
Consumer | Other consumer legacy services
Operating revenues by products and services
OPERATING REVENUES	81	71	220	204
Consumer | Data integration
Operating revenues by products and services
OPERATING REVENUES	$ 1	$ 1	$ 2	$ 3