Composition of Other Intangible Assets Net (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Amount	17,886	$ 17,482
Accumulated Amortization	(12,107)	(11,754)
Net Amount	5,779us-gaap_FiniteLivedIntangibleAssetsNet	5,728us-gaap_FiniteLivedIntangibleAssetsNet
Customer Lists
Finite-Lived Intangible Assets [Line Items]
Gross Amount	3,617	3,618
Accumulated Amortization	(2,980)	(2,924)
Net Amount	637	694
Customer Lists \| Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life for finite-lived intangible assets, years	5 years
Customer Lists \| Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life for finite-lived intangible assets, years	13 years
Non-Network Internal-Use Software
Finite-Lived Intangible Assets [Line Items]
Gross Amount	13,544	13,194
Accumulated Amortization	(8,756)	(8,462)
Net Amount	4,788	4,732
Non-Network Internal-Use Software \| Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life for finite-lived intangible assets, years	3 years
Non-Network Internal-Use Software \| Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life for finite-lived intangible assets, years	7 years
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Gross Amount	725	670
Accumulated Amortization	(371)	(368)
Net Amount	354	$ 302
Other Intangible Assets \| Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life for finite-lived intangible assets, years	5 years
Other Intangible Assets \| Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life for finite-lived intangible assets, years	25 years

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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