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Derivatives and Risk Management Activities (Details 5) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 item | Mar. 31, 2012 | Dec. 31, 2012 item
Derivatives disclosures |  |  |
Asset Derivatives Fair Value | $ 191 |  | $ 191
Liability Derivatives Fair Value | (169) |  | (189)
Net (loss) deferred in AOCI | (98) |  |
Net gain expected to be reclassified to earnings in next 12 months | 21 |  |
Loss expected to be reclassified to earnings prior to 2016 | (2) |  |
Gain (loss) expected to be reclassified to earnings through 2045 | (117) |  |
Net deferred gain/(loss) recognized in AOCI on derivatives (effective portion) | 22 | 76 |
Broker receivable | 82 |  | 41
Initial margin | 70 |  | 69
Variation margin paid/(received) | 12 |  | (28)
Derivative credit-risk related contingent features | none of our outstanding derivatives contained credit-risk related contingent features that would result in a material adverse impact to us upon any change in our credit ratings |  | none of our outstanding derivatives contained credit-risk related contingent features that would result in a material adverse impact to us upon any change in our credit ratings
Number of outstanding derivative containing credit-risk related contingent features | 0 |  | 0
Commodity |  |  |
Derivatives disclosures |  |  |
Net deferred gain/(loss) recognized in AOCI on derivatives (effective portion) | 3 | 25 |
Interest Rate Contracts |  |  |
Derivatives disclosures |  |  |
Net deferred gain/(loss) recognized in AOCI on derivatives (effective portion) | 19 | 51 |
Derivatives designated as hedging instruments |  |  |
Derivatives disclosures |  |  |
Asset Derivatives Fair Value | 68 |  | 56
Liability Derivatives Fair Value | (74) |  | (62)
Derivatives designated as hedging instruments | Commodity | Other current assets |  |  |
Derivatives disclosures |  |  |
Asset Derivatives Fair Value | 55 |  | 45
Liability Derivatives Fair Value | (48) |  | (23)
Derivatives designated as hedging instruments | Commodity | Other long-term assets |  |  |
Derivatives disclosures |  |  |
Asset Derivatives Fair Value | 10 |  | 11
Liability Derivatives Fair Value | (2) |  | (1)
Derivatives designated as hedging instruments | Interest Rate Contracts | Other long-term assets |  |  |
Derivatives disclosures |  |  |
Asset Derivatives Fair Value | 3 |  |
Derivatives designated as hedging instruments | Interest Rate Contracts | Other current liabilities |  |  |
Derivatives disclosures |  |  |
Liability Derivatives Fair Value | (1) |  |
Derivatives designated as hedging instruments | Interest Rate Contracts | Other long term liabilities |  |  |
Derivatives disclosures |  |  |
Liability Derivatives Fair Value | (23) |  | (38)
Derivatives not designated as hedging instruments |  |  |
Derivatives disclosures |  |  |
Asset Derivatives Fair Value | 123 |  | 135
Liability Derivatives Fair Value | (95) |  | (127)
Derivatives not designated as hedging instruments | Commodity | Other current assets |  |  |
Derivatives disclosures |  |  |
Asset Derivatives Fair Value | 121 |  | 128
Liability Derivatives Fair Value | (88) |  | (115)
Derivatives not designated as hedging instruments | Commodity | Other long-term assets |  |  |
Derivatives disclosures |  |  |
Asset Derivatives Fair Value | 2 |  | 1
Liability Derivatives Fair Value | (4) |  | (3)
Derivatives not designated as hedging instruments | Commodity | Other current liabilities |  |  |
Derivatives disclosures |  |  |
Asset Derivatives Fair Value |  |  | 4
Liability Derivatives Fair Value | (1) |  | (7)
Derivatives not designated as hedging instruments | Commodity | Other long term liabilities |  |  |
Derivatives disclosures |  |  |
Asset Derivatives Fair Value |  |  | 2
Liability Derivatives Fair Value | (1) |  | (2)
Derivatives not designated as hedging instruments | Foreign currency derivatives | Other current liabilities |  |  |
Derivatives disclosures |  |  |
Liability Derivatives Fair Value | $ (1) |  |

X
- Definition The estimated net amount of existing gains (losses) on cash flow hedges at the reporting date expected to be reclassified to earnings within year two and year three following the date of the latest balance sheet presented in the financial statements. + References No definition available. + Details
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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings through 2045. + References No definition available. + Details
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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 Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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=20435746&loc=SL7669646-108580 Reference 3: 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=20435746&loc=d3e681-108580 Reference 4: 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=7668309&loc=d3e80784-113994 Reference 5: 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=20435746&loc=d3e637-108580 Reference 6: 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=20435746&loc=SL7669686-108580 + Details
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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80748-113994 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph b(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Description of the existence and nature of credit-risk-related contingent features related to derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) that are in a net liability position at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44D -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624258-113959 + Details
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