Derivatives and Risk Management Activities (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Impact of derivative activities recognized in earnings
Total	$ (41)	$ 124	$ (36)
Commodity \| Supply and Logistics segment revenues
Impact of derivative activities recognized in earnings
Total	(39)	72	(62)
Commodity \| Facilities segment revenues
Impact of derivative activities recognized in earnings
Total	(11)	3	11
Commodity \| Purchases and related costs
Impact of derivative activities recognized in earnings
Total		46	6
Commodity \| Field Operating costs
Impact of derivative activities recognized in earnings
Total	8	1	1
Interest Rate Contracts \| Interest expense
Impact of derivative activities recognized in earnings
Total	(4)	(3)	1
Foreign exchange contracts \| Supply and Logistics segment revenues
Impact of derivative activities recognized in earnings
Total		(1)	1
Foreign exchange contracts \| Other income/(expense), net
Impact of derivative activities recognized in earnings
Total	5	6	6
Derivatives designated as hedging instruments
Impact of derivative activities recognized in earnings
Amount of gain/(loss) reclassified from AOCI into income	66	62	(131)
Other gain/(loss) recognized in income	1		(6)
Derivatives designated as hedging instruments \| Commodity \| Supply and Logistics segment revenues
Impact of derivative activities recognized in earnings
Amount of gain/(loss) reclassified from AOCI into income	78	12	(153)
Other gain/(loss) recognized in income	(1)		(8)
Derivatives designated as hedging instruments \| Commodity \| Facilities segment revenues
Impact of derivative activities recognized in earnings
Amount of gain/(loss) reclassified from AOCI into income	(10)	3	11
Other gain/(loss) recognized in income	(1)	(1)
Derivatives designated as hedging instruments \| Commodity \| Purchases and related costs
Impact of derivative activities recognized in earnings
Amount of gain/(loss) reclassified from AOCI into income		45	6
Derivatives designated as hedging instruments \| Interest Rate Contracts \| Interest expense
Impact of derivative activities recognized in earnings
Amount of gain/(loss) reclassified from AOCI into income	(7)	(4)	(1)
Other gain/(loss) recognized in income	3	1	2
Derivatives designated as hedging instruments \| Foreign exchange contracts \| Other income/(expense), net
Impact of derivative activities recognized in earnings
Amount of gain/(loss) reclassified from AOCI into income	5	6	6
Derivatives designated as hedging instruments \| Hedged Transactions probable of not occurring \| Supply and Logistics segment revenues
Impact of derivative activities recognized in earnings
Other gain/(loss) recognized in income	3
Derivatives designated as hedging instruments \| Hedged Transactions probable of not occurring \| Facilities segment revenues
Impact of derivative activities recognized in earnings
Other gain/(loss) recognized in income	(1)		1
Derivatives designated as hedging instruments \| Hedged Transactions probable of not occurring \| Other income/(expense), net
Impact of derivative activities recognized in earnings
Other gain/(loss) recognized in income			1
Derivatives not designated as hedging instruments
Impact of derivative activities recognized in earnings
Total	(108)	62	101
Derivatives not designated as hedging instruments \| Commodity \| Supply and Logistics segment revenues
Impact of derivative activities recognized in earnings
Total	(116)	60	99
Derivatives not designated as hedging instruments \| Commodity \| Facilities segment revenues
Impact of derivative activities recognized in earnings
Total		1
Derivatives not designated as hedging instruments \| Commodity \| Purchases and related costs
Impact of derivative activities recognized in earnings
Total		1
Derivatives not designated as hedging instruments \| Commodity \| Field Operating costs
Impact of derivative activities recognized in earnings
Total	8	1	1
Derivatives not designated as hedging instruments \| Foreign exchange contracts \| Supply and Logistics segment revenues
Impact of derivative activities recognized in earnings
Total		$ (1)	$ 1