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Goodwill and Other Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill [Table Text Block]
Goodwill
Changes in the carrying amount of goodwill, included in Intangible assets – net of accumulated amortization, by reportable segment for the periods indicated are as follows:
 
Williams Partners
 
(Millions)
December 31, 2014
$
1,120

Purchase accounting adjustment
25

Impairment
(1,098
)
December 31, 2015
$
47

December 31, 2016
$
47

Schedule of Finite-Lived Intangible Assets [Table Text Block]
Other Intangible Assets
The gross carrying amount and accumulated amortization of other intangible assets, included in Intangible assets – net of accumulated amortization, at December 31 are as follows:
 
2016
 
2015
 
Gross Carrying Amount
 
Accumulated Amortization
 
Gross Carrying Amount
 
Accumulated Amortization
 
(Millions)
Contractual customer relationships
$
10,635

 
$
(1,019
)
 
$
10,633

 
$
(663
)