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Other Income and Expenses (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Segment Reporting Information [Line Items]    
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums $ 53  
Debt Instrument, Unamortized Premium 23  
Debt Instrument, Unamortized Discount (Premium), Net 30  
Williams Partners [Member]    
Segment Reporting Information [Line Items]    
Revenue adjustment associated with litigation   $ (15)
Other income (expense) - net [Member] | Williams Partners [Member]    
Segment Reporting Information [Line Items]    
Net foreign currency exchange (gains) losses (1) [1] 0 11
Gain (Loss) on Contract Termination (13) 0
Other income (expense) - net [Member] | Other [Member]    
Segment Reporting Information [Line Items]    
Gain on sale of unused pipe 0 (10)
Selling, general, and administrative expenses [Member] | Other [Member]    
Segment Reporting Information [Line Items]    
Project development costs   34
Selling, general, and administrative expenses and Operating and maintenance expenses [Member] | Williams Partners [Member]    
Segment Reporting Information [Line Items]    
Severance and other related costs 9 $ 26
Approximate percentage of workforce reductions   10.00%
Other Nonoperating Income (Expense) [Member] | Williams Partners [Member]    
Segment Reporting Information [Line Items]    
Allowance for funds used during construction, capitalized cost of equity 18 $ 17
Deferred taxes on equity funds used during construction [Member] | Other [Member]    
Segment Reporting Information [Line Items]    
Allowance for funds used during construction, capitalized cost of equity 28 $ 4
6.125% Senior Unsecured Notes due 2022 [Member] | Williams Partners L.P. [Member]    
Segment Reporting Information [Line Items]    
Long-term debt retired $ 750  
Long-term debt interest rate 6.125%  
[1] Primarily relates to gains and losses incurred on foreign currency transactions and the remeasurement of U.S. dollar denominated current assets and liabilities within our former Canadian operations.