Segment Disclosures (Tables)

3 Months Ended

Mar. 31, 2014

Segment Reporting [Abstract]

Reconciliation of segment revenues and segment profit (loss)

The following table reflects the reconciliation of Segment revenues and Segment profit (loss) to Total revenues and Operating income (loss) as reported in the Consolidated Statement of Income and Total assets by reportable segment.

	Williams Partners			Williams NGL & Petchem Services			Access Midstream Partners		Other			Eliminations			Total
	(Millions)
Three months ended March 31, 2014
Segment revenues:
Service revenues
External	$	763		$	—		$	—	$	56		$	—		$	819
Internal	—			—			—		3			(3		)	—
Total service revenues	763			—			—		59			(3		)	819
Product sales
External	930			—			—		—			—			930
Internal	—			—			—		—			—			—
Total product sales	930			—			—		—			—			930
Total revenues	$	1,693		$	—		$	—	$	59		$	(3	)	$	1,749
Segment profit (loss)	$	503		$	(100	)	$	6	$	3					$	412
Less equity earnings (losses)	23			(77		)	6		—						(48		)
Segment operating income (loss)	$	480		$	(23	)	$	—	$	3					460
General corporate expenses															(40		)
Operating income (loss)															$	420
Three months ended March 31, 2013
Segment revenues:
Service revenues
External	$	702		$	—		$	—	$	4		$	—		$	706
Internal	—			—			—		3			(3		)	—
Total service revenues	702			—			—		7			(3		)	706
Product sales
External	1,104			—			—		—			—			1,104
Internal	—			—			—		—			—			—
Total product sales	1,104			—			—		—			—			1,104
Total revenues	$	1,806		$	—		$	—	$	7		$	(3	)	$	1,810
Segment profit (loss)	$	494		$	(2	)	$	—	$	(5	)				$	487
Less:
Equity earnings (losses)	18			—			—		—						18
Income (loss) from investments	(1		)	—			—		—						(1		)
Segment operating income (loss)	$	477		$	(2	)	$	—	$	(5	)				470
General corporate expenses															(44		)
Operating income (loss)															$	426
March 31, 2014
Total assets	$	24,791		$	378		$	2,136	$	1,459		$	(458	)	$	28,306
December 31, 2013
Total assets	$	23,571		$	486		$	2,161	$	1,359		$	(435	)	$	27,142