Segment Disclosures Recon from Segment to Consolidated - Assets and Invesetments (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets		$ 47,870	$ 49,248
Investments		7,336	8,399
Additions to long-lived assets		2,960	20,413		$ 3,409
Operating Segments [Member] | Access Midstream [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets		21,050	22,470
Investments		5,039	6,004
Additions to long-lived assets		556	16,964	[1]	0
Operating Segments [Member] | Northeast G And P [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets		6,669	7,314
Investments		834	891
Additions to long-lived assets		367	1,079		1,376
Operating Segments [Member] | Atlantic Gulf [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets		12,171	11,114
Investments		959	985
Additions to long-lived assets		1,573	1,593		1,072
Operating Segments [Member] | West [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets		5,035	5,174
Investments		0	0
Additions to long-lived assets		225	168		210
Operating Segments [Member] | NGL And Petchem Services [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets		3,306	3,510
Investments		504	519
Additions to long-lived assets		236	601		746
Corporate, Non-Segment [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets		350	501
Investments		0	0
Additions to long-lived assets		3	8		5
Eliminations [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	[2]	(711)	(835)
Investments		0	0
Additions to long-lived assets		$ 0	$ 0		$ 0

[1] 2014 Additions to long-lived assets within our Access Midstream segment primarily includes the acquisition-date fair value of long-lived assets from the ACMP Acquisition (Note 2 – Acquisitions).

[2] Eliminations primarily relate to the intercompany accounts receivable generated by our cash management program.