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Derivatives and Risk Management Activities (Details 6) (USD $) In Millions | 6 Months Ended | 12 Months Ended |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |  | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2011 | Dec. 31, 2010 | Jun. 30, 2011 Commodity Level 1 | Dec. 31, 2010 Commodity Level 1 | Jun. 30, 2011 Level 1 | Dec. 31, 2010 Level 1 | Jun. 30, 2011 Interest Rate Contracts Level 2 | Jun. 30, 2011 Level 2 | Jun. 30, 2011 Commodity Level 3 | Dec. 31, 2010 Commodity Level 3 | Dec. 31, 2010 Interest Rate Contracts Level 3 | Dec. 31, 2010 Foreign exchange contracts Level 3 | Jun. 30, 2011 Level 3 | Jun. 30, 2010 Level 3 | Jun. 30, 2011 Level 3 | Jun. 30, 2010 Level 3 | Dec. 31, 2010 Level 3 | Jun. 30, 2011 Commodity Total | Dec. 31, 2010 Commodity Total | Jun. 30, 2011 Interest Rate Contracts Total | Dec. 31, 2010 Interest Rate Contracts Total | Dec. 31, 2010 Foreign exchange contracts Total | Jun. 30, 2011 Total | Dec. 31, 2010 Total | Jun. 30, 2011 Interest rate and commodity derivatives
Derivatives and Risk Management Activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Broker receivable resulting from cash collateral deposited | $ 33 | $ 99 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial margin | 65 | 56 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variation margin return | 32 | 43 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recurring Fair Value Measures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net asset/(liability) at fair value |  |  | 12 | (16) | 12 | (16) | 7 | 7 | 10 | (30) | 15 | 1 | 10 |  | 10 |  | (14) | 22 | (46) | 7 | 15 | 1 | 29 | (30) |
Roll forward of Level 3 Net Liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  |  |  |  |  |  |  |  |  |  | (5) | (5) | (14) | (28) |  |  |  |  |  |  |  |  |
Unrealized gains/(losses): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings |  |  |  |  |  |  |  |  |  |  |  |  | 7 | 5 | 13 | 12 |  |  |  |  |  |  |  |  |
Included in other comprehensive income |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 1 | (1) | 1 |  |  |  |  |  |  |  |  |
Settlements |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 6 | 33 | 27 |  |  |  |  |  |  |  |  |
Derivatives entered into during the period |  |  |  |  |  |  |  |  |  |  |  |  | 6 | 1 | (4) | (4) |  |  |  |  |  |  |  |  |
Transfers out of Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (17) |  |  |  |  |  |  |  |  |  |
Ending Balance |  |  |  |  |  |  |  |  |  |  |  |  | 10 | 8 | 10 | 8 |  |  |  |  |  |  |  |  |
Change in unrealized gains/(losses) included in earnings relating to level 3 derivatives still held at the end of the periods |  |  |  |  |  |  |  |  |  |  |  |  | 13 | 10 | 11 | 9 |  |  |  |  |  |  |  |  |
Transfers from level 3 to Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17

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- Definition This element represents a certain statement of financial position asset (liability) caption which represents a class of assets (liabilities), or which may include an individual asset (liability), measured at fair value on a recurring basis. + Details
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- Definition 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. + Details
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- Definition Settlements that have taken place during the period in relation to assets and liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy. + Details
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- Definition Derivatives entered place during the period in relation to assets and liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy. + Details
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- Definition Represents assets and liabilities transferred from level 3 to level 2 during the period. + Details
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- Definition Transfers out of assets and liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period. + Details
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- Definition The total gains or losses for the period (realized and unrealized), arising from the derivative net asset/liability balance measured at fair value on a recurring basis using unobservable inputs (Level 3) which are included in earnings or resulted in a changed in net asset/liability balance. + Details
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- Definition This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in the statement of income (or changes in net assets).Such unrealized (holding) gains or losses relate to those liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + Details
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- Definition The total gains or losses for the period (realized and unrealized), arising from the derivative net asset/liability balance measured at fair value on a recurring basis using unobservable inputs (Level 3) which are included in other comprehensive income (a separate component of shareholders' equity). + Details
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- Definition The derivative net asset/liability balance measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + Details
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- Definition The net change during the reporting period in money or securities placed with a broker or counterparty as security for a trading or derivative position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 + Details
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- Definition The amount of cash or securities placed with a broker or counterparty as security for a trading or derivatives securities position which was partially obtained with funds provided by the broker dealer. + Details
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- Definition Amount receivable from securities failed to deliver, certain deposits for securities borrowed, open transactions, good faith and margin deposits, commissions and floor brokerage items. Also cash and securities [guarantee] on deposit with [commodities] clearing organizations and other entities which provide services necessary to operations of the Company. This item would include, for instance, cash and securities advanced as [refundable] collateral for securities borrowed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Chapter 4 -Paragraph 80 -Subparagraph Exhibit 4-8, 4 -IssueDate 2006-05-01 + Details
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