Equity-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

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, 2015:

Restricted Common Units Outstanding	Units		Weighted- Average Fair Value
	(Millions)
Nonvested at December 31, 2014	1.3		$	59.35
Adjustment for unit split in ACMP Merger	0.1		$	—
Forfeited	(0.1	)	$	58.05
Vested	(0.1	)	$	59.28
Nonvested at December 31, 2015	1.2		$	55.93