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Investing Activities (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Other [Member]
Dec. 31, 2011
Other [Member]
Dec. 31, 2010
Other [Member]
Dec. 31, 2012
Williams Partners [Member]
Dec. 31, 2011
Williams Partners [Member]
Dec. 31, 2010
Williams Partners [Member]
Sep. 30, 2010
Overland Pass Pipeline Company LLC [Member]
Dec. 31, 2012
Overland Pass Pipeline Company LLC [Member]
Dec. 31, 2011
Overland Pass Pipeline Company LLC [Member]
Dec. 31, 2010
Overland Pass Pipeline Company LLC [Member]
Dec. 31, 2012
Gulfstream Natural Gas System LLC [Member]
Dec. 31, 2011
Gulfstream Natural Gas System LLC [Member]
Dec. 31, 2010
Gulfstream Natural Gas System LLC [Member]
Dec. 31, 2012
Discovery Producer Services LLC [Member]
Dec. 31, 2011
Discovery Producer Services LLC [Member]
Dec. 31, 2010
Discovery Producer Services LLC [Member]
Dec. 31, 2012
Laurel Mountain Midstream, LLC [Member]
Dec. 31, 2011
Laurel Mountain Midstream, LLC [Member]
Dec. 31, 2010
Laurel Mountain Midstream, LLC [Member]
Jun. 30, 2010
Accroven SRL sold [Member]
Dec. 31, 2012
Accroven SRL sold [Member]
Dec. 31, 2011
Accroven SRL sold [Member]
Dec. 31, 2010
Accroven SRL sold [Member]
Dec. 31, 2012
Aux Sable Liquid Products LP [Member]
Dec. 31, 2011
Aux Sable Liquid Products LP [Member]
Dec. 31, 2010
Aux Sable Liquid Products LP [Member]
Dec. 31, 2012
Other [Member]
Dec. 31, 2011
Other [Member]
Dec. 31, 2012
Access Midstream Partners [Member]
Dec. 20, 2012
Access Midstream Partners [Member]
Dec. 31, 2011
Access Midstream Partners [Member]
Investing income                                                                    
Equity earnings (losses) $ 111 [1] $ 155 [1] $ 143 [1] $ 0 $ 13 $ 34 $ 111 $ 142 $ 109                                                  
Income (loss) from investments 49 [1] 7 [1] 43 [1] 53 11 43 0 0 0                             53 11 43                
Impairment of cost-based investments 0 (1) 0                                                              
Interest income and other 28 7 2                                                              
Total investing income 188 168 188                                                              
Investments                                                                    
Equity Method Investments 3,987 1,390 1,342 0 7 193 1,800 1,383 1,045   454 433   348 362   350 [2] 182 [2]   444 [2] 291 [2]                 204 122 2,187   0
Cost method 0 1                                                                
Marketable equity securities 0 24                                                                
Total investments 3,987 1,415                                                                
Dividends and distributions                                                                    
Equity method investment, dividends or distributions 173 193 175               28 19 0 79 84 81 21 40 44               28 35 28          
Equity Method Investment, Ownership Percentage                   49.00% 50.00%     50.00%     60.00%     51.00%     50.00%                 25.00% 25.00%  
Proceeds from Sale of Equity Method Investments                                             107                      
Equity Method Investment, payments to purchase or contributions 2,651 211 488             424             169     174 137 43                   2,190    
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity 59                                                               1,270  
Proportionate share of amounts remaining for capital projects                                 189     55                            
Summarized Financial Position of Equity Method Investments                                                                    
Current assets 582 381                                                                
Noncurrent assets 11,571 8,004                                                                
Current liabilities 507 378                                                                
Noncurrent liabilities 3,807 2,324                                                                
Summarized Results of Operations of Equity Method Investments                                                                    
Gross revenue 1,821 1,808 1,545                                                              
Operating income 557 747 732                                                              
Net income 488 654 624                                                              
Related Party Transactions [Abstract]                                                                    
Related Party Transaction, Expenses from Transactions with Related Party 186 234 220                                                              
Related party transaction, operating fees 75 57 38                                                              
Related party transactions, payable $ 15 $ 23                                                                
[1] Items also included in segment profit (loss). (See Note 18.)
[2] We account for these investments under the equity method due to the significant participatory rights of our partners such that we do not control or are otherwise not the primary beneficiary of the investments.