Derivatives and Risk Management Activities (Details 4) (USD $) In Millions	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Impact of derivative activities recognized in earnings
Derivatives in hedging relationships	$ (166)	$ (14)	$ (240)	$ (29)
Derivative Not Designated As Hedge	36	38	44	44
Total	(130)	24	(196)	15
Commodity \| Supply and Logistics segment revenues
Impact of derivative activities recognized in earnings
Derivatives in hedging relationships	(161)	(6)	(236)	(26)
Derivative Not Designated As Hedge	36	28	40	55
Total	(125)	22	(196)	29
Derivatives in Cash Flow Hedging Relationships - Ineffective Portion		1	8
Commodity \| Transportation segment revenues
Impact of derivative activities recognized in earnings
Derivatives in hedging relationships				1
Total				1
Commodity \| Facilities segment revenues
Impact of derivative activities recognized in earnings
Derivatives in hedging relationships	(6)		(7)	(1)
Derivative Not Designated As Hedge	1		1	1
Total	(5)		(6)
Commodity \| Purchases and related costs
Impact of derivative activities recognized in earnings
Derivatives in hedging relationships		(8)		(3)
Derivative Not Designated As Hedge	(1)	11	(1)	(13)
Total	(1)	3	(1)	(16)
Commodity \| Field Operating costs
Impact of derivative activities recognized in earnings
Derivative Not Designated As Hedge			1
Total			1
Interest Rate Contracts \| Interest expense
Impact of derivative activities recognized in earnings
Derivatives in hedging relationships			1
Derivative Not Designated As Hedge		1		2
Total		1	1	2
Net gain associated with interest rate swaps designated as fair value hedges			1
Foreign exchange contracts \| Supply and Logistics segment revenues
Impact of derivative activities recognized in earnings
Derivative Not Designated As Hedge		(3)	3	(3)
Total		(3)	3	(3)
Foreign exchange contracts \| Purchases and related costs
Impact of derivative activities recognized in earnings
Derivative Not Designated As Hedge				2
Total				2
Foreign exchange contracts \| Other income, net
Impact of derivative activities recognized in earnings
Derivatives in hedging relationships	1		2
Derivative Not Designated As Hedge		1
Total	$ 1	$ 1	$ 2

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the effective portion of net gain or loss reclassified from accumulated other comprehensive income into income for cash flow hedges, (b) the amount of the hedge ineffectiveness for cash flow hedges, and (c) the amount of gain (loss) derived from fair value hedges.

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The net gain (loss) for interest expense recognized in earnings during the period associated with interest rate derivatives designated as fair value hedge.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 205G

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44C
-Subparagraph b

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- Definition

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

+ References

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- Definition

Net gain (loss) included in earnings for the period from the net change in fair value of derivative instrument not designated as hedging instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 45
-Subparagraph b(1)(b)

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