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Equity-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
The following summary reflects nonvested restricted common unit activity for awards issued by Williams Partners and related information for the year ended December 31, 2016:
Restricted Common Units Outstanding
Units
 
Weighted-
Average
Fair Value
 
(Millions)
 
 
Nonvested at December 31, 2015
1.2

 
$
55.93

Forfeited
(0.1
)
 
$
52.85

Vested
(0.5
)
 
$
59.09

Nonvested at December 31, 2016
0.6

 
$
52.97