Business Acquisitions (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Apr. 21, 2011 NaviSite [Member] years	Jun. 30, 2011 NewWave [Member] PSUs
Business Acquisition [Line Items]
Business acquisition, cost of acquired entity, cash paid	$ 263	$ 260
Business acquisition, long-term debt repaid	44
Business acquisition, purchase price allocation, goodwill amount	142
Business acquisition, purchase price allocation, property, plant and equipment amount	63
Business acquisition, acquired property, plant and equipment, depreciable period, minimum (in years)	2
Business acquisition, acquired property, plant and equipment, depreciable period, maximum (in years)	4
Business acquisition, purchase price allocation, intangible assets subject to amortization amount	$ 56
Business acquisition, acquired intangible assets subject to amortization, amortizable period, minimum (in years)	4
Business acquisition, acquired intangible assets subject to amortization, amortizable period, maximum (in years)	7
Business acquisition, primary service units acquired (in units)		130,000

The maximum amortization period of a major finite-lived intangible asset class acquired during the current period either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar either by their nature or by their use in the operations of a company.

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- Definition

The minimum amortization period of a major finite-lived intangible asset class acquired during the current period either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar either by their nature or by their use in the operations of a company.

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- Definition

The number of primary service units (e.g., the total of all video, high-speed data and voice subscribers) acquired.

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- Definition

The maximum depreciable period of a major long lived, physical asset class acquired during the current period either individually or as part of a group of assets (in either an asset acquisition or business combination). Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. A major class is composed of long lived assets that can be grouped together because they are similar either by their nature or by their use in the operations of a company.

+ Details

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- Definition

The minimum depreciable period of a major long lived, physical asset class acquired during the current period either individually or as part of a group of assets (in either an asset acquisition or business combination). Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. A major class is composed of long lived assets that can be grouped together because they are similar either by their nature or by their use in the operations of a company.

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- Definition

Amount of cash paid to acquire the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph f(1)

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51
-Subparagraph d

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will be amortized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 52

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51
-Subparagraph e

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- Definition

Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 52
-Subparagraph c

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 53
-Subparagraph d

+ Details

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- Definition

The amount of acquisition cost of a business combination allocated to the noncurrent portion of the long-term debt assumed from the acquired entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51
-Subparagraph e

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 37
-Subparagraph g

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 98-1

+ Details

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- Definition

The amount of acquisition cost of a business combination allocated to property, plant and equipment to be used in ongoing operations.

+ References

+ Details

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