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Fair Value Measurements (Details Guarantees and Credit Risk) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Concentration Risk [Line Items]    
Receivables by product or service $ 1,041 $ 1,139
Customer Concentration Risk [Member] | Accounts receivable [Member] | Chesapeake Energy Corporation [Member] | Williams Partners [Member]    
Concentration Risk [Line Items]    
Receivables by product or service $ 364 $ 308
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Chesapeake Energy Corporation [Member] | Williams Partners [Member]    
Concentration Risk [Line Items]    
Concentration Risk, Percentage 18.00% 9.00%
NGLs, natural gas, and related products and services [Member]    
Concentration Risk [Line Items]    
Receivables by product or service $ 823 $ 730
Transportation of natural gas and related products [Member]    
Concentration Risk [Line Items]    
Receivables by product or service 202 175
Income tax receivable [Member]    
Concentration Risk [Line Items]    
Receivables by product or service 7 167
Other Receivable [Member]    
Concentration Risk [Line Items]    
Receivables by product or service 9 $ 67
Minimum Volume Commitment [Member] | Customer Concentration Risk [Member] | Chesapeake Energy Corporation [Member] | Williams Partners [Member]    
Concentration Risk [Line Items]    
Receivables by product or service 198  
Wiltel Guarantee [Member]    
Guarantor Obligations [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted $ 33