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Price Risk Management Activities, Gain (Loss) by Income Statement Location (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Price Risk Management Activities (Textual) |  |  |  |
Accumulated other comprehensive income, cumulative after-tax gains on cash flow hedges | $ 0 |  | $ 0 |
Fair Value Hedging [Member] | Commodity Contracts [Member] | Cost of Sales [Member] |  |  |  |
Effect of Derivative Instruments on Income and OCI |  |  |  |
Gain (loss) recognized in income on derivatives | 0 | $ 5,000,000 | 0 | $ (26,000,000)
Gain (loss) recognized in income on hedged item | 0 | (5,000,000) | 0 | 25,000,000
Loss recognized in income on derivatives (ineffective portion) | 0 | 0 | 0 | (1,000,000)
Cash Flow Hedging [Member] | Commodity Contracts [Member] |  |  |  |
Effect of Derivative Instruments on Income and OCI |  |  |  |
Gain (loss) recognized in OCI on derivatives (effective portion) | 0 | (3,000,000) | 0 | 4,000,000
Cash Flow Hedging [Member] | Commodity Contracts [Member] | Cost of Sales [Member] |  |  |  |
Effect of Derivative Instruments on Income and OCI |  |  |  |
Gain reclassified from accumulated OCI into income (effective portion) | 0 | 0 | 0 | 3,000,000
Gain (loss) recognized in income on derivatives (ineffective portion) | 0 | 3,000,000 | 0 | (1,000,000)
Economic Hedging [Member] | Commodity Contracts [Member] | Cost of Sales [Member] |  |  |  |
Effect of Derivative Instruments on Income and OCI |  |  |  |
Gain (loss) recognized in income on derivatives | (27,000,000) | (136,000,000) | 37,000,000 | (132,000,000)
Economic Hedging [Member] | Foreign Currency Contracts [Member] | Cost of Sales [Member] |  |  |  |
Effect of Derivative Instruments on Income and OCI |  |  |  |
Gain (loss) recognized in income on derivatives | (15,000,000) | (32,000,000) | 7,000,000 | (23,000,000)
Trading Derivatives [Member] | Commodity Contracts [Member] | Cost of Sales [Member] |  |  |  |
Effect of Derivative Instruments on Income and OCI |  |  |  |
Gain (loss) recognized in income on derivatives | $ 1,000,000 | $ 4,000,000 | $ 21,000,000 | $ 3,000,000

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- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80784-113994 + Details
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