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Fair Value Measurements Nonrecurring Measurements (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
 [3]
Dec. 31, 2014
Jun. 30, 2014
 [3]
Sep. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value Assets Measured On Nonrecurring Basis [Abstract]                        
Impairment of goodwill       $ 1,098           $ 0 $ 1,098 $ 0
Impairment of certain assets                   873 209 52
Impairment of equity-method investments                   430 1,359 0
Delaware Basin Gas Gathering System [Member]                        
Fair Value Assets Measured On Nonrecurring Basis [Abstract]                        
Impairment of equity-method investments                   59 503  
Appalachia Midstream Investments [Member]                        
Fair Value Assets Measured On Nonrecurring Basis [Abstract]                        
Impairment of equity-method investments                   294 562  
Williams Partners [Member]                        
Fair Value Assets Measured On Nonrecurring Basis [Abstract]                        
Impairment of goodwill                     1,098  
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Williams Partners [Member]                        
Fair Value Assets Measured On Nonrecurring Basis [Abstract]                        
Impairment of goodwill                 $ 0      
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Williams Partners [Member] | Minimum [Member]                        
Fair Value Assets Measured On Nonrecurring Basis [Abstract]                        
Discount rate       10.00%                
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Williams Partners [Member] | Maximum [Member]                        
Fair Value Assets Measured On Nonrecurring Basis [Abstract]                        
Discount rate       13.00%                
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | West [Member]                        
Fair Value Assets Measured On Nonrecurring Basis [Abstract]                        
Impairment of goodwill       $ 0                
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Property, plant, and equipment, net [Member] | Williams Partners [Member]                        
Fair Value Assets Measured On Nonrecurring Basis [Abstract]                        
Fair value of property, plant, and equipment   $ 18 [1]   13 [2]   $ 17 $ 32 [3] $ 46     13 [2] 32 [3]
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Property, plant, and equipment, net [Member] | Williams Ngl And Petchem Services [Member]                        
Fair Value Assets Measured On Nonrecurring Basis [Abstract]                        
Fair value of property, plant, and equipment $ 73     40 [4]           73 40 [4]  
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Assets Held For Sale [Member] | Williams Partners [Member]                        
Fair Value Assets Measured On Nonrecurring Basis [Abstract]                        
Assets Held-for-sale, Long Lived, Fair Value Disclosure [3]             1         1
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Investments [Member]                        
Fair Value Assets Measured On Nonrecurring Basis [Abstract]                        
Fair value of investment     $ 0 58             58  
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Investments [Member] | Williams Partners [Member]                        
Fair Value Assets Measured On Nonrecurring Basis [Abstract]                        
Fair value of investment $ 1,295 [5]   $ 1,294 [6] $ 4,017 [7] $ 1,203 [8]       $ 1,203 [8] 1,295 [5] 4,017 [7]  
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Investments [Member] | Williams Partners [Member] | Minimum [Member]                        
Fair Value Assets Measured On Nonrecurring Basis [Abstract]                        
Discount rate     13.00% [6] 10.80% [7]                
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Investments [Member] | Williams Partners [Member] | Maximum [Member]                        
Fair Value Assets Measured On Nonrecurring Basis [Abstract]                        
Discount rate     13.30% [6] 14.40% [7]                
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Investments [Member] | Williams Partners [Member] | Delaware Basin Gas Gathering System [Member]                        
Fair Value Assets Measured On Nonrecurring Basis [Abstract]                        
Discount rate [8]         11.80%              
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Investments [Member] | Williams Partners [Member] | Appalachia Midstream Investments [Member]                        
Fair Value Assets Measured On Nonrecurring Basis [Abstract]                        
Discount rate 10.20% [5]       8.80% [8]              
Canadian Operations [Member] | Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Assets Held For Sale [Member] | Williams Partners [Member]                        
Fair Value Assets Measured On Nonrecurring Basis [Abstract]                        
Assets Held-for-sale, Long Lived, Fair Value Disclosure [9]   924                    
Canadian Operations [Member] | Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Assets Held For Sale [Member] | Williams Ngl And Petchem Services [Member]                        
Fair Value Assets Measured On Nonrecurring Basis [Abstract]                        
Assets Held-for-sale, Long Lived, Fair Value Disclosure [9]   206                    
Impairment Of Goodwill [Member] | Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Williams Partners [Member]                        
Fair Value Assets Measured On Nonrecurring Basis [Abstract]                        
Impairment of goodwill       $ 1,098                
Impairment Of Certain Assets [Member]                        
Fair Value Assets Measured On Nonrecurring Basis [Abstract]                        
Impairment of certain assets                   873 209 52
Impairment Of Certain Assets [Member] | Fair Value, Measurements, Nonrecurring [Member]                        
Fair Value Assets Measured On Nonrecurring Basis [Abstract]                        
Impairment of certain assets [10]                   70 31 10
Impairment Of Certain Assets [Member] | Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]                        
Fair Value Assets Measured On Nonrecurring Basis [Abstract]                        
Impairment of certain assets                   803 178 $ 42
Impairment Of Certain Assets [Member] | Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Williams Partners [Member]                        
Fair Value Assets Measured On Nonrecurring Basis [Abstract]                        
Impairment of certain assets   48 [1]   94 [2]   $ 20 13 [3] $ 17        
Impairment of Long-Lived Assets to be Disposed of [3]             $ 12          
Impairment Of Certain Assets [Member] | Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Williams Ngl And Petchem Services [Member]                        
Fair Value Assets Measured On Nonrecurring Basis [Abstract]                        
Impairment of certain assets $ 8     64 [4]                
Impairment Of Certain Assets [Member] | Canadian Operations [Member] | Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Williams Partners [Member]                        
Fair Value Assets Measured On Nonrecurring Basis [Abstract]                        
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down [9]   341                    
Impairment Of Certain Assets [Member] | Canadian Operations [Member] | Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Williams Ngl And Petchem Services [Member]                        
Fair Value Assets Measured On Nonrecurring Basis [Abstract]                        
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down [9]   $ 406                    
Impairment Of Equity-Method Investments [Member] | Fair Value, Measurements, Nonrecurring [Member]                        
Fair Value Assets Measured On Nonrecurring Basis [Abstract]                        
Impairment of equity-method investments                   $ 430 $ 1,359  
Impairment Of Equity-Method Investments [Member] | Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]                        
Fair Value Assets Measured On Nonrecurring Basis [Abstract]                        
Impairment of equity-method investments     $ 3 8                
Impairment Of Equity-Method Investments [Member] | Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Williams Partners [Member]                        
Fair Value Assets Measured On Nonrecurring Basis [Abstract]                        
Impairment of equity-method investments $ 318 [5]   $ 109 [6] $ 890 [7] $ 461 [8]              
[1] Relates to certain gathering assets within the Mid-Continent region. The estimated fair value was determined by a market approach based on our analysis of observable inputs in the principal market.
[2] Relates to a gas processing plant, the completion of which is considered remote due to unfavorable impact of low natural gas prices on customer drilling activities. The assessed fair value primarily represents the estimated salvage value of certain equipment measured using a market approach based on our analysis of observable inputs in the principal market.
[3] Relates to certain surplus equipment. The estimated fair value was determined by a market approach based on our analysis of observable inputs in the principal market.
[4] Relates to an olefins pipeline project, the completion of which is considered remote due to lack of customer interest. The assessed fair value primarily represents the estimated fair value of unused pipeline measured using a market approach based on our analysis of observable inputs in the principal market.
[5] Relates to equity-method investments in Ranch Westex and multiple Appalachia Midstream Investments. The historical carrying value of these investments was initially recorded based on estimated fair value during the third quarter of 2014 in conjunction with the acquisition of ACMP. We estimated the fair value of these Appalachia Midstream Investments using an income approach based on expected future cash flows and appropriate discount rates. The determination of estimated future cash flows involved significant assumptions regarding gathering volumes, rates, and related capital spending. The discount rate utilized for the Appalachia Midstream Investments evaluation was 10.2 percent and reflected our cost of capital as impacted by market conditions and risks associated with the underlying businesses. In addition to utilizing an income approach, we also considered a market approach for certain Appalachia Midstream Investments and Ranch Westex based on an agreement reached in February 2017 to exchange our interests in DBJV and Ranch Westex for additional interests in certain Appalachia Midstream Investments and cash.
[6] Relates to equity-method investments in DBJV and Laurel Mountain. Our carrying values in these equity-method investments had been written down to fair value at December 31, 2015. Our first-quarter 2016 analysis reflected higher discount rates for both of these investments, along with lower natural gas prices for Laurel Mountain. We estimated the fair value of these investments using an income approach based on expected future cash flows and appropriate discount rates. The determination of estimated future cash flows involved significant assumptions regarding gathering volumes and related capital spending. Discount rates utilized ranged from 13.0 percent to 13.3 percent and reflected increases in our cost of capital, revised estimates of expected future cash flows, and risks associated with the underlying businesses.
[7] Relates to equity-method investments in DBJV, certain of the Appalachia Midstream Investments, UEOM, and Laurel Mountain. We estimated the fair value of these investments using an income approach based on expected future cash flows and appropriate discount rates. The determination of estimated future cash flows involved significant assumptions regarding gathering volumes and related capital spending. Discount rates utilized ranged from 10.8 percent to 14.4 percent and reflected further fourth-quarter 2015 increases in our cost of capital, revised estimates of expected future cash flows, and risks associated with the underlying businesses.
[8] Relates to equity-method investments in DBJV and certain of the Appalachia Midstream Investments. The historical carrying value of these investments was initially recorded based on estimated fair value during the third quarter of 2014 in conjunction with the acquisition of ACMP. We estimated the fair value of these investments using an income approach based on expected future cash flows and appropriate discount rates. The determination of estimated future cash flows involved significant assumptions regarding gathering volumes and related capital spending. Discount rates utilized were 11.8 percent and 8.8 percent for DBJV and certain of the Appalachia Midstream Investments, respectively, and reflected our cost of capital as impacted by market conditions, and risks associated with the underlying businesses.
[9] Relates to our Canadian operations. We designated these operations as held for sale as of June 30, 2016. As a result, we measured the fair value of the disposal group, resulting in an impairment charge. The estimated fair value was determined by a market approach based primarily on inputs received in the marketing process and reflected our estimate of the potential assumed proceeds. We disposed of our Canadian operations through a sale during the third quarter of 2016. See Note 3 – Divestiture.
[10] Reflects multiple individually insignificant impairments and write-downs of other certain assets that may no longer be in use or are surplus in nature for which the fair value was determined to be zero or an insignificant salvage value.