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Credit Facilities and Commercial Paper (Details 4) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Transcontinental Gas Pipe Line Company, LLC [Member]
Dec. 31, 2013
Northwest Pipeline LLC [Member]
Dec. 31, 2013
Williams Partners L. P. [Member]
Dec. 31, 2012
Williams Partners L. P. [Member]
Jul. 31, 2013
$2.4 Billion Unsecured Credit Facility terminated July 2013 [Member]
Williams Partners L. P. [Member]
Dec. 31, 2013
$2.5 Billion Unsecured Credit Facility [Member]
Transcontinental Gas Pipe Line Company, LLC [Member]
Dec. 31, 2013
$2.5 Billion Unsecured Credit Facility [Member]
Northwest Pipeline LLC [Member]
Dec. 31, 2013
$2.5 Billion Unsecured Credit Facility [Member]
Williams Partners L. P. [Member]
Dec. 31, 2013
$2.5 Billion Unsecured Credit Facility Letter of Credit [Member]
Williams Partners L. P. [Member]
Dec. 31, 2013
$2 Billion Unsecured Commercial Paper Notes [Member]
Williams Partners L. P. [Member]
Jul. 31, 2013
$900 million Unsecured Credit Facility terminated July 2013 [Member]
Dec. 31, 2013
$1.5 Billion Unsecured Credit Facility [Member]
Dec. 31, 2013
$1.5 Billion Unsecured Credit Facility Letter of Credit [Member]
Dec. 31, 2013
$1.5 Billion Unsecured Credit Facility Letter of Credit Under Bilateral Bank Agreements [Member]
Credit Facility and Commercial Paper [Line Items]                                
Credit facility, capacity             $ 2,400 $ 500 $ 500 $ 2,500 $ 1,300 $ 2,000 $ 900 $ 1,500 $ 700  
Credit facility, loans outstanding         0 375       0       0    
Credit facility, letters of credit outstanding                     0       0 16
Commercial paper, outstanding 225 0                   225        
Commercial paper, weighted average interest rate                       0.42%        
Commercial paper, maximum maturity                       397 days        
Additional amount by which credit facility can be increased                   500       500    
Maximum ratio of debt to EBITDA 450.00%       500.00%                      
Minimum aggregate purchase price of acquisitions impacting maximum ratio of debt to EBITDA $ 50       $ 50                      
Maximum ratio of debt to EBITDA after acquisition 500.00%       550.00%                      
Maximum ratio of debt to capitalization     65.00% 65.00%                        
Commitment fee 0.225%       0.175%