Segment Disclosures (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Segment revenues:
Total revenues	$ 1,749	$ 1,810
Segment profit (loss)	412	487
Equity earnings (losses)	(48)	18
Income (loss) from investments		(1)
Operating income (loss)	420	426
Total assets and equity method investments by reporting segment
Total assets	28,306		27,142
Service [Member]
Segment revenues:
Total revenues	819	706
Product [Member]
Segment revenues:
Total revenues	930	1,104
Williams Partners [Member]
Total assets and equity method investments by reporting segment
Total assets	24,791		23,571
Williams Partners [Member] | Service [Member]
Segment revenues:
Total revenues	763	702
Williams Partners [Member] | Product [Member]
Segment revenues:
Total revenues	930	1,104
Williams NGL & Petchem Services [Member]
Total assets and equity method investments by reporting segment
Total assets	378		486
Williams NGL & Petchem Services [Member] | Service [Member]
Segment revenues:
Total revenues	0	0
Williams NGL & Petchem Services [Member] | Product [Member]
Segment revenues:
Total revenues	0	0
Access Midstream Partners [Member]
Total assets and equity method investments by reporting segment
Total assets	2,136		2,161
Access Midstream Partners [Member] | Service [Member]
Segment revenues:
Total revenues	0	0
Access Midstream Partners [Member] | Product [Member]
Segment revenues:
Total revenues	0	0
Other [Member]
Total assets and equity method investments by reporting segment
Total assets	1,459		1,359
Other [Member] | Service [Member]
Segment revenues:
Total revenues	56	4
Other [Member] | Product [Member]
Segment revenues:
Total revenues	0	0
Operating Segments [Member]
Segment revenues:
Operating income (loss)	460	470
Operating Segments [Member] | Williams Partners [Member]
Segment revenues:
Total revenues	1,693	1,806
Segment profit (loss)	503	494
Equity earnings (losses)	23	18
Income (loss) from investments		(1)
Operating income (loss)	480	477
Operating Segments [Member] | Williams Partners [Member] | Service [Member]
Segment revenues:
Total revenues	763	702
Operating Segments [Member] | Williams Partners [Member] | Product [Member]
Segment revenues:
Total revenues	930	1,104
Operating Segments [Member] | Williams NGL & Petchem Services [Member]
Segment revenues:
Total revenues	0	0
Segment profit (loss)	(100)	(2)
Equity earnings (losses)	(77)	0
Income (loss) from investments		0
Operating income (loss)	(23)	(2)
Operating Segments [Member] | Williams NGL & Petchem Services [Member] | Service [Member]
Segment revenues:
Total revenues	0	0
Operating Segments [Member] | Williams NGL & Petchem Services [Member] | Product [Member]
Segment revenues:
Total revenues	0	0
Operating Segments [Member] | Access Midstream Partners [Member]
Segment revenues:
Total revenues	0	0
Segment profit (loss)	6	0
Equity earnings (losses)	6	0
Income (loss) from investments		0
Operating income (loss)	0	0
Operating Segments [Member] | Access Midstream Partners [Member] | Service [Member]
Segment revenues:
Total revenues	0	0
Operating Segments [Member] | Access Midstream Partners [Member] | Product [Member]
Segment revenues:
Total revenues	0	0
Operating Segments [Member] | Other [Member]
Segment revenues:
Total revenues	59	7
Segment profit (loss)	3	(5)
Equity earnings (losses)	0	0
Income (loss) from investments		0
Operating income (loss)	3	(5)
Operating Segments [Member] | Other [Member] | Service [Member]
Segment revenues:
Total revenues	59	7
Operating Segments [Member] | Other [Member] | Product [Member]
Segment revenues:
Total revenues	0	0
Intersegment Elimination [Member]
Segment revenues:
Total revenues	(3)	(3)
Total assets and equity method investments by reporting segment
Total assets	(458)		(435)
Intersegment Elimination [Member] | Service [Member]
Segment revenues:
Total revenues	(3)	(3)
Intersegment Elimination [Member] | Product [Member]
Segment revenues:
Total revenues	0	0
Intersegment Elimination [Member] | Williams Partners [Member] | Service [Member]
Segment revenues:
Total revenues	0	0
Intersegment Elimination [Member] | Williams Partners [Member] | Product [Member]
Segment revenues:
Total revenues	0	0
Intersegment Elimination [Member] | Williams NGL & Petchem Services [Member] | Service [Member]
Segment revenues:
Total revenues	0	0
Intersegment Elimination [Member] | Williams NGL & Petchem Services [Member] | Product [Member]
Segment revenues:
Total revenues	0	0
Intersegment Elimination [Member] | Access Midstream Partners [Member] | Service [Member]
Segment revenues:
Total revenues	0	0
Intersegment Elimination [Member] | Access Midstream Partners [Member] | Product [Member]
Segment revenues:
Total revenues	0	0
Intersegment Elimination [Member] | Other [Member] | Service [Member]
Segment revenues:
Total revenues	(3)	(3)
Intersegment Elimination [Member] | Other [Member] | Product [Member]
Segment revenues:
Total revenues	0	0
General Corporate Expenses [Member]
Segment revenues:
Operating income (loss)	$ (40)	$ (44)