Derivatives and Risk Management Activities - Financial Impact (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Impact of derivative activities recognized in earnings
Derivative liability	$ 131	$ 72
Total gain/(loss) on derivatives recognized in net income	30	0	$ 0
Total Gain/(Loss) on Derivatives Recognized in Net Income	(324)	156	153
Loss on cash flow hedge ineffectiveness	4	0	0
Commodity derivatives, net | Supply and Logistics segment revenues
Impact of derivative activities recognized in earnings
Total Gain/(Loss) on Derivatives Recognized in Net Income	(342)	208	205
Commodity derivatives, net | Transportation segment revenues
Impact of derivative activities recognized in earnings
Total Gain/(Loss) on Derivatives Recognized in Net Income	5	8
Commodity derivatives, net | Field operating costs
Impact of derivative activities recognized in earnings
Total Gain/(Loss) on Derivatives Recognized in Net Income		(18)	(21)
Interest rate derivatives, net | Interest expense, net
Impact of derivative activities recognized in earnings
Total Gain/(Loss) on Derivatives Recognized in Net Income	(14)	(11)	(5)
Foreign currency derivatives, net | Supply and Logistics segment revenues
Impact of derivative activities recognized in earnings
Total Gain/(Loss) on Derivatives Recognized in Net Income	(3)	(31)	(28)
Foreign currency derivatives, net | Other income/(expense), net
Impact of derivative activities recognized in earnings
Total Gain/(Loss) on Derivatives Recognized in Net Income			2
Preferred Distribution Rate Reset Option | Other income/(expense), net
Impact of derivative activities recognized in earnings
Total Gain/(Loss) on Derivatives Recognized in Net Income	30
Derivatives in Hedging Relationships
Impact of derivative activities recognized in earnings
Total Gain/(Loss) on Derivatives Recognized in Net Income	(12)	45	(4)
Derivatives in Hedging Relationships | Supply and Logistics segment revenues
Impact of derivative activities recognized in earnings
Gain (loss) on discontinuation of cash flow hedge due to forecasted transaction probable of not Occurring, net	2
Derivatives in Hedging Relationships | Interest expense, net
Impact of derivative activities recognized in earnings
Gain (loss) on discontinuation of cash flow hedge due to forecasted transaction probable of not Occurring, net	2	4
Derivatives in Hedging Relationships | Commodity derivatives, net | Supply and Logistics segment revenues
Impact of derivative activities recognized in earnings
Total Gain/(Loss) on Derivatives Recognized in Net Income	2	56	(1)
Derivatives in Hedging Relationships | Interest rate derivatives, net | Interest expense, net
Impact of derivative activities recognized in earnings
Total Gain/(Loss) on Derivatives Recognized in Net Income	(14)	(11)	(5)
Derivatives in Hedging Relationships | Foreign currency derivatives, net | Other income/(expense), net
Impact of derivative activities recognized in earnings
Total Gain/(Loss) on Derivatives Recognized in Net Income			2
Derivatives Not Designated as a Hedge
Impact of derivative activities recognized in earnings
Total Gain/(Loss) on Derivatives Recognized in Net Income	(312)	111	157
Derivatives Not Designated as a Hedge | Commodity derivatives, net | Supply and Logistics segment revenues
Impact of derivative activities recognized in earnings
Total Gain/(Loss) on Derivatives Recognized in Net Income	(344)	152	206
Derivatives Not Designated as a Hedge | Commodity derivatives, net | Transportation segment revenues
Impact of derivative activities recognized in earnings
Total Gain/(Loss) on Derivatives Recognized in Net Income	5	8
Derivatives Not Designated as a Hedge | Commodity derivatives, net | Field operating costs
Impact of derivative activities recognized in earnings
Total Gain/(Loss) on Derivatives Recognized in Net Income		(18)	(21)
Derivatives Not Designated as a Hedge | Foreign currency derivatives, net | Supply and Logistics segment revenues
Impact of derivative activities recognized in earnings
Total Gain/(Loss) on Derivatives Recognized in Net Income	(3)	$ (31)	$ (28)
Derivatives Not Designated as a Hedge | Preferred Distribution Rate Reset Option | Other income/(expense), net
Impact of derivative activities recognized in earnings
Total Gain/(Loss) on Derivatives Recognized in Net Income	30
Series A Preferred Units | Embedded derivative financial instruments
Impact of derivative activities recognized in earnings
Derivative liability	32
Total gain/(loss) on derivatives recognized in net income	$ 30