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Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified |
12 Months Ended | 12 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2013
Segment
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Dec. 31, 2012
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Dec. 31, 2011
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Jan. 28, 2014
Subsequent Event
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Jan. 28, 2014
Subsequent Event
Increase in number of authorized common shares
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Dec. 31, 2013
Capitalized non-network internal-use software
Minimum
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Dec. 31, 2013
Capitalized non-network internal-use software
Maximum
|
Dec. 31, 2011
Property Plant and Equipment by Estimated Useful Life
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Dec. 31, 2013
Wireline
Country
|
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| Organization And Summary Of Significant Accounting Policies [Line Items] | |||||||||
| Number of countries outside the United States of America to which our Wireline segment provides products and services | 150 | ||||||||
| Number of Reportable Segments | 2 | ||||||||
| Stock options and restricted stock units outstanding to purchase shares included in diluted earnings per common share | 8,000,000 | 9,000,000 | 6,000,000 | ||||||
| Anti-dilutive shares not included in computation of diluted earnings per common share | 19,000,000 | ||||||||
| Number of Common stock authorized to be issued | 4,250,000,000 | 6,250,000,000 | 2,000,000,000 | ||||||
| Number of preferred stock authorized to be issued | 250,000,000 | ||||||||
| Increase in Depreciation expenses | $ 15,019 | $ 14,920 | $ 14,991 | $ 400 | |||||
| Useful life for finite-lived intangible assets, years | 3 years | 7 years | |||||||
| Wireless license period | 10 years | ||||||||
| Percentage of benefit realized on ultimate settlement | 50.00% | ||||||||