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Plan Assets Related to Pension Benefits by Level within the Fair Value Hierarchy (Detail) (Pension Plans, Defined Benefit, USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Plan assets $ 2,742 $ 2,550 $ 2,522
Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets
      
Plan assets 2,729 [1] 2,537 [1]  
Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 1 [Member]
      
Plan assets 2,205 [1] 2,036 [1]  
Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 2 [Member]
      
Plan assets 524 [1] 501 [1]  
Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 3 [Member]
      
Plan assets 0 [1] 0 [1]  
Money Market Funds [Member] | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets
      
Plan assets 48 [1] 45 [1]  
Money Market Funds [Member] | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 1 [Member]
      
Plan assets 48 [1] 45 [1]  
Money Market Funds [Member] | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 2 [Member]
      
Plan assets 0 [1] 0 [1]  
Money Market Funds [Member] | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 3 [Member]
      
Plan assets 0 [1] 0 [1]  
Mutual Funds | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | International
      
Plan assets 401 [1] 351 [1]  
Mutual Funds | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Large Cap Funds
      
Plan assets   426 [1]  
Mutual Funds | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Small and Mid Cap Funds
      
Plan assets   214 [1]  
Mutual Funds | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 1 [Member] | International
      
Plan assets 401 [1] 351 [1]  
Mutual Funds | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 1 [Member] | Large Cap Funds
      
Plan assets   426 [1]  
Mutual Funds | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 1 [Member] | Small and Mid Cap Funds
      
Plan assets   214 [1]  
Mutual Funds | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 2 [Member] | International
      
Plan assets 0 [1] 0 [1]  
Mutual Funds | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 2 [Member] | Large Cap Funds
      
Plan assets   0 [1]  
Mutual Funds | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 2 [Member] | Small and Mid Cap Funds
      
Plan assets   0 [1]  
Mutual Funds | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 3 [Member] | International
      
Plan assets 0 [1] 0 [1]  
Mutual Funds | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 3 [Member] | Large Cap Funds
      
Plan assets   0 [1]  
Mutual Funds | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 3 [Member] | Small and Mid Cap Funds
      
Plan assets   0 [1]  
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Consumer
      
Plan assets 218 [1] 107 [1]  
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Public Utility, Equities
      
Plan assets 127 [1] 48 [1]  
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Banks, Trust and Insurance, Equities
      
Plan assets 136 [1] 21 [1]  
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Health Businesses
      
Plan assets 111 [1] 58 [1]  
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Industry
      
Plan assets 197 [1] 62 [1]  
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Information Systems and Technology
      
Plan assets 199 [1] 136 [1]  
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Materials Businesses
      
Plan assets 45 [1] 17 [1]  
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | 517919 All Other Telecommunications [Member]
      
Plan assets 17 [1]    
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Exchange Traded Funds
      
Plan assets 172 [1] 116 [1]  
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 1 [Member] | Consumer
      
Plan assets 218 [1] 107 [1]  
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 1 [Member] | Public Utility, Equities
      
Plan assets 127 [1] 48 [1]  
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 1 [Member] | Banks, Trust and Insurance, Equities
      
Plan assets 136 [1] 21 [1]  
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 1 [Member] | Health Businesses
      
Plan assets 111 [1] 58 [1]  
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 1 [Member] | Industry
      
Plan assets 197 [1] 62 [1]  
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 1 [Member] | Information Systems and Technology
      
Plan assets 199 [1] 136 [1]  
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 1 [Member] | Materials Businesses
      
Plan assets 45 [1] 17 [1]  
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 1 [Member] | 517919 All Other Telecommunications [Member]
      
Plan assets 17 [1]    
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 1 [Member] | Exchange Traded Funds
      
Plan assets 172 [1] 116 [1]  
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 2 [Member] | Consumer
      
Plan assets 0 [1] 0 [1]  
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 2 [Member] | Public Utility, Equities
      
Plan assets 0 [1] 0 [1]  
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 2 [Member] | Banks, Trust and Insurance, Equities
      
Plan assets 0 [1] 0 [1]  
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 2 [Member] | Health Businesses
      
Plan assets 0 [1] 0 [1]  
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 2 [Member] | Industry
      
Plan assets 0 [1] 0 [1]  
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 2 [Member] | Information Systems and Technology
      
Plan assets 0 [1] 0 [1]  
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 2 [Member] | Materials Businesses
      
Plan assets 0 [1] 0 [1]  
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 2 [Member] | 517919 All Other Telecommunications [Member]
      
Plan assets 0 [1]    
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 2 [Member] | Exchange Traded Funds
      
Plan assets 0 [1] 0 [1]  
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 3 [Member] | Consumer
      
Plan assets 0 [1] 0 [1]  
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 3 [Member] | Public Utility, Equities
      
Plan assets 0 [1] 0 [1]  
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 3 [Member] | Banks, Trust and Insurance, Equities
      
Plan assets 0 [1] 0 [1]  
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 3 [Member] | Health Businesses
      
Plan assets 0 [1] 0 [1]  
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 3 [Member] | Industry
      
Plan assets 0 [1] 0 [1]  
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 3 [Member] | Information Systems and Technology
      
Plan assets 0 [1] 0 [1]  
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 3 [Member] | Materials Businesses
      
Plan assets 0 [1] 0 [1]  
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 3 [Member] | 517919 All Other Telecommunications [Member]
      
Plan assets 0 [1]    
Equity Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 3 [Member] | Exchange Traded Funds
      
Plan assets 0 [1] 0 [1]  
Fixed Income Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | International
      
Plan assets 77 [1] 103 [1]  
Fixed Income Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | US Treasury Securities [Member]
      
Plan assets 534 [1] 435 [1]  
Fixed Income Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Corporate | Investment grade
      
Plan assets 412 [1] 398 [1]  
Fixed Income Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Preferred Securities Domestic [Member]
      
Plan assets 33 [1]    
Fixed Income Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Preferred Securities Foreign [Member]
      
Plan assets 2 [1]    
Fixed Income Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 1 [Member] | International
      
Plan assets 0 [1] 0 [1]  
Fixed Income Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member]
      
Plan assets 534 [1] 435 [1]  
Fixed Income Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 1 [Member] | Corporate | Investment grade
      
Plan assets 0 [1] 0 [1]  
Fixed Income Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 1 [Member] | Preferred Securities Domestic [Member]
      
Plan assets 0 [1]    
Fixed Income Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 1 [Member] | Preferred Securities Foreign [Member]
      
Plan assets 0 [1]    
Fixed Income Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 2 [Member] | International
      
Plan assets 77 [1] 103 [1]  
Fixed Income Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member]
      
Plan assets 0 [1] 0 [1]  
Fixed Income Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 2 [Member] | Corporate | Investment grade
      
Plan assets 412 [1] 398 [1]  
Fixed Income Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 2 [Member] | Preferred Securities Domestic [Member]
      
Plan assets 33 [1]    
Fixed Income Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 2 [Member] | Preferred Securities Foreign [Member]
      
Plan assets 2 [1]    
Fixed Income Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 3 [Member] | International
      
Plan assets 0 [1] 0 [1]  
Fixed Income Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 3 [Member] | US Treasury Securities [Member]
      
Plan assets 0 [1] 0 [1]  
Fixed Income Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 3 [Member] | Corporate | Investment grade
      
Plan assets 0 [1] 0 [1]  
Fixed Income Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 3 [Member] | Preferred Securities Domestic [Member]
      
Plan assets 0 [1]    
Fixed Income Securities | Excludes Accrued Income of Less Than 0.6 Percent of Total Plan Assets | Fair Value, Inputs, Level 3 [Member] | Preferred Securities Foreign [Member]
      
Plan assets $ 0 [1]    
[1] Schedule does not include accrued income amounting to less than 0.5% of total plan assets.