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Credit Facilities and Commercial Paper (Details 2) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Credit Facility and Commercial Paper [Line Items]    
Commercial paper, outstanding $ 0 $ 225
$1.5 Billion Unsecured Credit Facility [Member]
   
Credit Facility and Commercial Paper [Line Items]    
Credit facility, capacity 1,500  
Credit facility, loans outstanding 0  
$2.5 Billion Unsecured Credit Facility [Member] | Williams Partners L. P. [Member]
   
Credit Facility and Commercial Paper [Line Items]    
Credit facility, capacity 2,500  
Credit facility, loans outstanding 0  
$2.5 Billion Unsecured Credit Facility Letter of Credit [Member] | Williams Partners L. P. [Member]
   
Credit Facility and Commercial Paper [Line Items]    
Credit facility, capacity 1,300  
Credit facility, letters of credit outstanding 0  
$1.5 Billion Unsecured Credit Facility Letter of Credit [Member]
   
Credit Facility and Commercial Paper [Line Items]    
Credit facility, capacity 700  
Credit facility, letters of credit outstanding 0  
$1.5 Billion Unsecured Credit Facility Letter of Credit Under Bilateral Bank Agreements [Member]
   
Credit Facility and Commercial Paper [Line Items]    
Credit facility, letters of credit outstanding 15  
$2.5 Billion Unsecured Credit Facility Letter of Credit Under Bilateral Bank Agreements [Member] | Williams Partners L. P. [Member]
   
Credit Facility and Commercial Paper [Line Items]    
Credit facility, letters of credit outstanding $ 9