Divestiture (Details) - Canadian Operations [Member] - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement and Additional Disclosures by Disposal Groups [Line Items]
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down					$ 341
Disposal Group, Not Discontinued Operations [Member]
Income Statement and Additional Disclosures by Disposal Groups [Line Items]
Disposal Group, Consideration		$ 839			839
Divested cash of disposal group		13			13
Income (Loss) from Individually Significant Component Disposed of Attributable to Parent, before Income Tax [Abstract]
Income (loss) before income taxes of disposal group		16		$ 3	(9)	$ 6
NGL And Petchem Services [Member] | Other (income) expense - net [Member] | Disposal Group, Not Discontinued Operations [Member]
Income Statement and Additional Disclosures by Disposal Groups [Line Items]
Loss on sale of Canadian operations		32		$ 0	32	$ 0
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments		11
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | NGL And Petchem Services [Member] | Impairment Of Long Lived Assets [Member] | Disposal Group, Not Discontinued Operations [Member]
Income Statement and Additional Disclosures by Disposal Groups [Line Items]
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down	[1]		$ 341
Cash Consideration [Member] | Disposal Group, Not Discontinued Operations [Member]
Income Statement and Additional Disclosures by Disposal Groups [Line Items]
Disposal Group, Consideration		510			510
Escrow Consideration [Member] | Other Current Assets [Member] | Disposal Group, Not Discontinued Operations [Member]
Income Statement and Additional Disclosures by Disposal Groups [Line Items]
Disposal Group, Consideration		171			171
Other Consideration [Member] | Other Current Assets [Member] | Disposal Group, Not Discontinued Operations [Member]
Income Statement and Additional Disclosures by Disposal Groups [Line Items]
Disposal Group, Consideration		8			8
Reduction In Incentive Distribution Rights Payment [Member] | General Partner Equity [Member] | Disposal Group, Not Discontinued Operations [Member]
Income Statement and Additional Disclosures by Disposal Groups [Line Items]
Disposal Group, Consideration		$ 150			$ 150

[1] Relates to our Canadian operations. We designated these operations as held for sale as of June 30, 2016. As a result, we measured the fair value of the disposal group, resulting in an impairment charge. The estimated fair value was determined by a market approach based primarily on inputs received in the marketing process and reflected our estimate of the potential assumed proceeds. We disposed of our Canadian operations through a sale during the third quarter of 2016. See Note 2 – Divestiture.