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Fair Value (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 | Dec. 31, 2011
Fair Value Disclosures Details [Abstract] |  |  |
An input assumption is considered significant if it affects the fair value by at least 10%. | 10.00% |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Abstract |  |  |
Available-for-sale securities | $ 1,717,000,000 |  | $ 1,340,000,000
Trading securities | 12,000,000 |  | 12,000,000
Derivatives | 109,000,000 |  | 120,000,000
Total assets | 1,838,000,000 |  | 1,472,000,000
Derivatives | 648,000,000 |  | 690,000,000
Total liabilities | 648,000,000 |  | 690,000,000
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |
Asset Impairment Charges | 11,000,000 | 0 |
Other non-operating expense | 49,000,000 | 0 |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |  |
Balance at beginning of period | (148,000,000) | 49,000,000 |
Included in earnings | 5,000,000 | 11,000,000 |
Included in other comprehensive income | 15,000,000 | (12,000,000) |
Included in regulatory (assets) liabilities | 0 | (1,000,000) |
Settlements | 8,000,000 | 2,000,000 |
Transfers of assets (liabilities) into Level 3 | (28,000,000) | (4,000,000) |
Transfers of (assets) liabilities out of Level 3 | 26,000,000 |  |
Balance at end of period | (122,000,000) | 45,000,000 |
Total gains/(losses) for the period included in earnings attributable to the change in unrealized gains/(losses) relating to assets and liabilities held at the end of the period | 6,000,000 | 10,000,000 |
Debt securities |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at beginning of period | 0 | 42,000,000 |
Settlements | 0 | (2,000,000) |
Balance at end of period | 0 | 40,000,000 |
Total gains/(losses) for the period included in earnings attributable to the change in unrealized gains/losses relating to assets held at the end of the period | 0 | 0 |
Interest Rate Derivatives |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |  |
Balance at beginning of period | (128,000,000) | (1,000,000) |
Included in earnings | (1,000,000) | 0 |
Included in other comprehensive income | 1,000,000 | (4,000,000) |
Included in regulatory (assets) liabilities | 0 | 0 |
Settlements | 6,000,000 | 0 |
Transfers of assets (liabilities) into Level 3 | (28,000,000) | (2,000,000) |
Transfers of (assets) liabilities out of Level 3 | 26,000,000 |  |
Balance at end of period | (124,000,000) | (7,000,000) |
Total gains/(losses) for the period included in earnings attributable to the change in unrealized gains/(losses) relating to assets and liabilities held at the end of the period | 0 | 0 |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |
Own credit risk (minimum) | 3.30% |  |
Own credit risk (maximum) | 4.10% |  |
Own credit risk (weighted average) | 3.50% |  |
Cross Currency Swaps |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |  |
Balance at beginning of period | (18,000,000) | 10,000,000 |
Included in earnings | 0 | 2,000,000 |
Included in other comprehensive income | 14,000,000 | (8,000,000) |
Included in regulatory (assets) liabilities | 0 | 0 |
Settlements | 4,000,000 | 1,000,000 |
Transfers of assets (liabilities) into Level 3 | 0 | 0 |
Transfers of (assets) liabilities out of Level 3 | 0 |  |
Balance at end of period | 0 | 5,000,000 |
Total gains/(losses) for the period included in earnings attributable to the change in unrealized gains/(losses) relating to assets and liabilities held at the end of the period | 0 | 2,000,000 |
Foreign Currency |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |  |
Balance at beginning of period | 51,000,000 | 22,000,000 |
Included in earnings | (2,000,000) | 1,000,000 |
Included in other comprehensive income | 0 | 0 |
Included in regulatory (assets) liabilities | 0 | 0 |
Settlements | (1,000,000) | 1,000,000 |
Transfers of assets (liabilities) into Level 3 | 0 | (1,000,000) |
Transfers of (assets) liabilities out of Level 3 | 0 |  |
Balance at end of period | 48,000,000 | 23,000,000 |
Total gains/(losses) for the period included in earnings attributable to the change in unrealized gains/(losses) relating to assets and liabilities held at the end of the period | (3,000,000) | 0 |
Commodity & Other |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |  |
Balance at beginning of period | (53,000,000) | 18,000,000 |
Included in earnings | 8,000,000 | 8,000,000 |
Included in other comprehensive income | 0 | 0 |
Included in regulatory (assets) liabilities | 0 | (1,000,000) |
Settlements | (1,000,000) | 0 |
Transfers of assets (liabilities) into Level 3 | 0 | (1,000,000) |
Transfers of (assets) liabilities out of Level 3 | 0 |  |
Balance at end of period | (46,000,000) | 24,000,000 |
Total gains/(losses) for the period included in earnings attributable to the change in unrealized gains/(losses) relating to assets and liabilities held at the end of the period | 9,000,000 | 8,000,000 |
Foreign currency: Embedded derivative - Argentina Peso |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |  |
Balance at end of period | 48,000,000 |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |
Embedded derivative - Argentine Peso | 6.13 |  |
Foreign currency: Other |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |  |
Balance at end of period | 0 |  |
Commodity & other: Embedded derivative - Philippine Peso |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |  |
Balance at end of period | 10,000,000 |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |
U.S. Producer Price Index after 5 years (where base year of 2005 = 100), Minimum | 143 |  |
U.S. Producer Price Index after 5 years (where base year of 2005 = 100), Maximum | 174 |  |
U.S. Producer Price Index after 5 years (where base year of 2005 = 100), Weighted Average | 157 |  |
Commodity & other: Other |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |  |
Balance at end of period | (2,000,000) |  |
Commodity & other: Embedded derivative - Aluminum |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |  |
Balance at end of period | (54,000,000) |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |
Market Price of Power for Customer in Cameroon (per MWh), Minimum | 0.06 |  |
Market Price of Power for Customer in Cameroon (per MWh), Maximum | 0.18 |  |
Market Price Of Power For Customer In Cameroon Weighted Average | 0.13 |  |
Nonrecurring | Long Lived Assets Held And Used [Member] | Kelanitissa [Member] |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |
Asset Impairment Charges | 5,000,000 |  |
Nonrecurring | Equity Method Affiliate [Member] | Other Subsidiary [Member] |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |
Other non-operating expense | 49,000,000 |  |
Level 1 |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Abstract |  |  |
Available-for-sale securities | 2,000,000 |  | 1,000,000
Trading securities | 12,000,000 |  | 12,000,000
Derivatives | 2,000,000 |  | 2,000,000
Total assets | 16,000,000 |  | 15,000,000
Derivatives | 0 |  | 0
Total liabilities | 0 |  | 0
Level 2 |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Abstract |  |  |
Available-for-sale securities | 1,715,000,000 |  | 1,339,000,000
Trading securities | 0 |  | 0
Derivatives | 41,000,000 |  | 52,000,000
Total assets | 1,756,000,000 |  | 1,391,000,000
Derivatives | 460,000,000 |  | 476,000,000
Total liabilities | 460,000,000 |  | 476,000,000
Level 3 |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Abstract |  |  |
Available-for-sale securities | 0 |  | 0
Trading securities | 0 |  | 0
Derivatives | 66,000,000 |  | 66,000,000
Total assets | 66,000,000 |  | 66,000,000
Derivatives | 188,000,000 |  | 214,000,000
Total liabilities | 188,000,000 |  | 214,000,000
Carrying Amount |  |  |
Financial Instruments Not Measured At Fair Value In the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Long-term receivables | 408,000,000 |  | 386,000,000
Non-recourse debt | 16,035,000,000 |  | 15,535,000,000
Recourse debt | 6,200,000,000 |  | 6,485,000,000
Carrying Amount | Nonrecurring | Long Lived Assets Held And Used [Member] | Kelanitissa [Member] |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |
Carrying Amount, Nonrecurring | 22,000,000 |  |
Carrying Amount | Nonrecurring | Equity Method Affiliate [Member] | Other Subsidiary [Member] |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |
Carrying Amount, Nonrecurring | 204,000,000 |  |
Fair Value |  |  |
Financial Instruments Not Measured At Fair Value In the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Long-term receivables | 454,000,000 |  | 401,000,000
Non-recourse debt | 16,369,000,000 |  | 15,862,000,000
Recourse debt | 6,809,000,000 |  | 6,640,000,000
Fair Value | Level 1 |  |  |
Financial Instruments Not Measured At Fair Value In the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Long-term receivables | 0 |  |
Non-recourse debt | 0 |  |
Recourse debt | 0 |  |
Fair Value | Level 1 | Nonrecurring | Long Lived Assets Held And Used [Member] | Kelanitissa [Member] |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |
Fair Value, Nonrecurring | 0 |  |
Fair Value | Level 1 | Nonrecurring | Equity Method Affiliate [Member] | Other Subsidiary [Member] |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |
Fair Value, Nonrecurring | 0 |  |
Fair Value | Level 2 |  |  |
Financial Instruments Not Measured At Fair Value In the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Long-term receivables | 0 |  |
Non-recourse debt | 15,339,000,000 |  |
Recourse debt | 6,809,000,000 |  |
Fair Value | Level 2 | Nonrecurring | Long Lived Assets Held And Used [Member] | Kelanitissa [Member] |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |
Fair Value, Nonrecurring | 0 |  |
Fair Value | Level 2 | Nonrecurring | Equity Method Affiliate [Member] | Other Subsidiary [Member] |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |
Fair Value, Nonrecurring | 155,000,000 |  |
Fair Value | Level 3 |  |  |
Financial Instruments Not Measured At Fair Value In the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Long-term receivables | 454,000,000 |  |
Non-recourse debt | 1,030,000,000 |  |
Recourse debt | 0 |  |
Fair Value | Level 3 | Nonrecurring | Long Lived Assets Held And Used [Member] | Kelanitissa [Member] |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |
Fair Value, Nonrecurring | 17,000,000 |  |
Fair Value | Level 3 | Nonrecurring | Equity Method Affiliate [Member] | Other Subsidiary [Member] |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |
Fair Value, Nonrecurring | $ 0 |  |

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- Definition The maximum credit rating used by the parent company or subsidiary to determine the fair value of derivative instruments at the balance sheet date. + References No definition available. + Details
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- Definition The minimum credit rating used by the parent company or subsidiary to determine the fair value of derivative instruments at the balance sheet date. + References No definition available. + Details
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- Definition This element represents net derivative assets and liabilities measured at fair value using significant unobservable inputs (Level 3) which are required for reconciliation purposes of beginning and ending balances. + References No definition available. + Details
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- Definition The maximum market price of power for customers in Cameroon used to determine the fair value of derivative instruments at the balance sheet date. + References No definition available. + Details
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- Definition The minimum market price of power for customers in Cameroon used to determine the fair value of derivative instruments at the balance sheet date. + References No definition available. + Details
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- Definition Non-recourse debt is secured by the capital stock, physical assets, contracts and cash flows of the related subsidiary. The risk is limited to the respective subsidiary business and is without recourse to the Parent Company and other subsidiaries. + References No definition available. + Details
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- Definition The weighted average U.S. Dollar indexation in Argentina used to determine the fair value of derivative instruments at the balance sheet date. + References No definition available. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -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 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6379932&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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- Definition Derivative instrument obligations meeting the definition of a liability which the Company is a party to as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 10 -Subparagraph i -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 Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 6 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 15 -Paragraph 83 -URI http://asc.fasb.org/extlink&oid=6913464&loc=d3e34841-113949 + 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) in other income. Such unrealized (holding) gains or losses relate to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph d -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 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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- Definition Settlements that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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- Definition This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c -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 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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- Definition This element represents the aggregate of the liabilities reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition The aggregate amount of other expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating expense recognized during the period. Such amounts may include: (a) unusual costs, (b) loss on foreign exchange transactions, (c) losses on securities (net of profits), and (d) miscellaneous other expense items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Trading Securities which consist of all investments in certain debt and equity securities that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for which an entity has elected the fair value option. Trading generally reflects active and frequent buying and selling, and trading securities are generally used with the objective of generating profits on short-term differences in price, but this category of investments may also include items which are not intended to be sold in the near term or for which the fair value option has been elected. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -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 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6379932&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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