Segment Disclosures (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Segment revenues:
Total revenues	$ 1,678	$ 1,767	$ 3,427	$ 3,577
Segment profit (loss)	395	456	807	943
Equity earnings (losses)	37	38	(11)	56
Income (loss) from investments	4	25	4	24
Operating income (loss)	311	350	731	776
Total assets and equity method investments by reporting segment
Total assets	34,949		34,949		27,142
Service [Member]
Segment revenues:
Total revenues	825	721	1,644	1,427
Product [Member]
Segment revenues:
Total revenues	853	1,046	1,783	2,150
Williams Partners [Member]
Total assets and equity method investments by reporting segment
Total assets	25,738		25,738		23,571
Williams Partners [Member] | Service [Member]
Segment revenues:
Total revenues	763	717	1,526	1,419
Williams Partners [Member] | Product [Member]
Segment revenues:
Total revenues	853	1,046	1,783	2,150
Williams NGL & Petchem Services [Member]
Total assets and equity method investments by reporting segment
Total assets	439		439		486
Williams NGL & Petchem Services [Member] | Service [Member]
Segment revenues:
Total revenues	0	0	0	0
Williams NGL & Petchem Services [Member] | Product [Member]
Segment revenues:
Total revenues	0	0	0	0
Access Midstream Partners [Member]
Total assets and equity method investments by reporting segment
Total assets	2,113		2,113		2,161
Access Midstream Partners [Member] | Service [Member]
Segment revenues:
Total revenues	0	0	0	0
Access Midstream Partners [Member] | Product [Member]
Segment revenues:
Total revenues	0	0	0	0
Other [Member]
Total assets and equity method investments by reporting segment
Total assets	7,202		7,202		1,359
Other [Member] | Service [Member]
Segment revenues:
Total revenues	62	4	118	8
Other [Member] | Product [Member]
Segment revenues:
Total revenues	0	0	0	0
Operating Segments [Member]
Segment revenues:
Operating income (loss)	354	393	814	863
Operating Segments [Member] | Williams Partners [Member]
Segment revenues:
Total revenues	1,616	1,763	3,309	3,569
Segment profit (loss)	393	427	896	921
Equity earnings (losses)	32	35	55	53
Income (loss) from investments	0	(1)	0	(2)
Operating income (loss)	361	393	841	870
Operating Segments [Member] | Williams Partners [Member] | Service [Member]
Segment revenues:
Total revenues	763	717	1,526	1,419
Operating Segments [Member] | Williams Partners [Member] | Product [Member]
Segment revenues:
Total revenues	853	1,046	1,783	2,150
Operating Segments [Member] | Williams NGL & Petchem Services [Member]
Segment revenues:
Total revenues	0	0	0	0
Segment profit (loss)	(8)	(1)	(108)	(3)
Equity earnings (losses)	(2)	0	(79)	0
Income (loss) from investments	0	0	0	0
Operating income (loss)	(6)	(1)	(29)	(3)
Operating Segments [Member] | Williams NGL & Petchem Services [Member] | Service [Member]
Segment revenues:
Total revenues	0	0	0	0
Operating Segments [Member] | Williams NGL & Petchem Services [Member] | Product [Member]
Segment revenues:
Total revenues	0	0	0	0
Operating Segments [Member] | Access Midstream Partners [Member]
Segment revenues:
Total revenues	0	0	0	0
Segment profit (loss)	9	29	15	29
Equity earnings (losses)	7	3	13	3
Income (loss) from investments	4	26	4	26
Operating income (loss)	(2)	0	(2)	0
Operating Segments [Member] | Access Midstream Partners [Member] | Service [Member]
Segment revenues:
Total revenues	0	0	0	0
Operating Segments [Member] | Access Midstream Partners [Member] | Product [Member]
Segment revenues:
Total revenues	0	0	0	0
Operating Segments [Member] | Other [Member]
Segment revenues:
Total revenues	66	7	125	14
Segment profit (loss)	1	1	4	(4)
Equity earnings (losses)	0	0	0	0
Income (loss) from investments	0	0	0	0
Operating income (loss)	1	1	4	(4)
Operating Segments [Member] | Other [Member] | Service [Member]
Segment revenues:
Total revenues	66	7	125	14
Operating Segments [Member] | Other [Member] | Product [Member]
Segment revenues:
Total revenues	0	0	0	0
Intersegment Elimination [Member]
Segment revenues:
Total revenues	(4)	(3)	(7)	(6)
Total assets and equity method investments by reporting segment
Total assets	(543)		(543)		(435)
Intersegment Elimination [Member] | Service [Member]
Segment revenues:
Total revenues	(4)	(3)	(7)	(6)
Intersegment Elimination [Member] | Product [Member]
Segment revenues:
Total revenues	0	0	0	0
Intersegment Elimination [Member] | Williams Partners [Member] | Service [Member]
Segment revenues:
Total revenues	0	0	0	0
Intersegment Elimination [Member] | Williams Partners [Member] | Product [Member]
Segment revenues:
Total revenues	0	0	0	0
Intersegment Elimination [Member] | Williams NGL & Petchem Services [Member] | Service [Member]
Segment revenues:
Total revenues	0	0	0	0
Intersegment Elimination [Member] | Williams NGL & Petchem Services [Member] | Product [Member]
Segment revenues:
Total revenues	0	0	0	0
Intersegment Elimination [Member] | Access Midstream Partners [Member] | Service [Member]
Segment revenues:
Total revenues	0	0	0	0
Intersegment Elimination [Member] | Access Midstream Partners [Member] | Product [Member]
Segment revenues:
Total revenues	0	0	0	0
Intersegment Elimination [Member] | Other [Member] | Service [Member]
Segment revenues:
Total revenues	(4)	(3)	(7)	(6)
Intersegment Elimination [Member] | Other [Member] | Product [Member]
Segment revenues:
Total revenues	0	0	0	0
General Corporate Expenses [Member]
Segment revenues:
Operating income (loss)	$ (43)	$ (43)	$ (83)	$ (87)