Reportable Segments Segment Assets (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Assets	$ 43,589	$ 43,702
Intrastate Transportation And Storage [Member]
Segment Reporting Information [Line Items]
Assets	4,514	4,606
Interstate Transportation and Storage [Member]
Segment Reporting Information [Line Items]
Assets	10,238	10,988
Midstream [Member]
Segment Reporting Information [Line Items]
Assets	3,176	3,133
NGL Transportation And Services [Member] [Member]
Segment Reporting Information [Line Items]
Assets	4,464	4,326
Investment in Sunoco Logistics:
Segment Reporting Information [Line Items]
Assets	12,917	11,650
Retail marketing:
Segment Reporting Information [Line Items]
Assets	4,271	3,936
Other Segments [Member]
Segment Reporting Information [Line Items]
Assets	$ 4,009	$ 5,063