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Derivative Instruments and Hedging Activities - Part 3 (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Gain Loss By Type Of Derivative Tables |  |  |  |
Gains (Losses) Recognized in AOCL | $ (62) | $ (303) | $ (194) | $ (398)
Gains (Losses) Reclassified from AOCL into Earnings | (32) | (65) | (191) | (127)
Gains (Losses) Recognized in Earnings (ineffective portion) | (3) | (3) | (3) | (13)
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) | (4) | (25) | (95) | (9)
Derivative Instruments Other Disclosures [Abstract] |  |  |  |
Gain Loss Reclassified Into Earnings Discontinuance Of Cash Flow Hedge Net | (11) | 0 | (11) | 0
Interest Rate Derivatives |  |  |  |
AOCI to be recognized in next 12 months table |  |  |  |
Accumulated Other Comprehensive Income Loss Before Tax Expected Increase Decrease Next Twelve Months | (106) |  | (106) |
Gain Loss By Type Of Derivative Tables |  |  |  |
Gains (Losses) Recognized in AOCL | (62) | (295) | (204) | (391)
Interest Rate Derivatives | Interest Expense [Member] |  |  |  |
Gain Loss By Type Of Derivative Tables |  |  |  |
Gains (Losses) Reclassified from AOCL into Earnings | (40) | (35) | (102) | (91)
Gains (Losses) Recognized in Earnings (ineffective portion) | (2) | 1 | (1) | (6)
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) | (2) | (1) | (5) | (2)
Interest Rate Derivatives | Non-regulated cost of sales |  |  |  |
Gain Loss By Type Of Derivative Tables |  |  |  |
Gains (Losses) Reclassified from AOCL into Earnings | (1) | (1) | (4) | (3)
Interest Rate Derivatives | Net Equity In Earnings Of Affiliates [Member] |  |  |  |
Gain Loss By Type Of Derivative Tables |  |  |  |
Gains (Losses) Reclassified from AOCL into Earnings | (2) | (1) | (4) | (3)
Gains (Losses) Recognized in Earnings (ineffective portion) | 0 | (1) | (1) | (2)
Interest Rate Derivatives | Asset Impairment Expense [Member] |  |  |  |
Gain Loss By Type Of Derivative Tables |  |  |  |
Gains (Losses) Reclassified from AOCL into Earnings | (5) | 0 | (5) | 0
Interest Rate Derivatives | Gain on sale of investments [Member] |  |  |  |
Gain Loss By Type Of Derivative Tables |  |  |  |
Gains (Losses) Reclassified from AOCL into Earnings | 0 | 0 | (96) | 0
Cross Currency Swaps |  |  |  |
AOCI to be recognized in next 12 months table |  |  |  |
Accumulated Other Comprehensive Income Loss Before Tax Expected Increase Decrease Next Twelve Months | 6 |  | 6 |
Gain Loss By Type Of Derivative Tables |  |  |  |
Gains (Losses) Recognized in AOCL | 4 | (37) | 9 | (34)
Cross Currency Swaps | Interest Expense [Member] |  |  |  |
Gain Loss By Type Of Derivative Tables |  |  |  |
Gains (Losses) Reclassified from AOCL into Earnings | (3) | (3) | (9) | (7)
Gains (Losses) Recognized in Earnings (ineffective portion) | (1) | (3) | (1) | (5)
Cross Currency Swaps | Foreign currency transaction gains (losses) [Member] |  |  |  |
Gain Loss By Type Of Derivative Tables |  |  |  |
Gains (Losses) Reclassified from AOCL into Earnings | 15 | (26) | 27 | (20)
Foreign Currency |  |  |  |
AOCI to be recognized in next 12 months table |  |  |  |
Accumulated Other Comprehensive Income Loss Before Tax Expected Increase Decrease Next Twelve Months | (5) |  | (5) |
Gain Loss By Type Of Derivative Tables |  |  |  |
Gains (Losses) Recognized in AOCL | 0 | 29 | 12 | 27
Foreign Currency | Foreign currency transaction gains (losses) [Member] |  |  |  |
Gain Loss By Type Of Derivative Tables |  |  |  |
Gains (Losses) Reclassified from AOCL into Earnings | 4 | 3 | 4 | (1)
Gains (Losses) Recognized in Earnings (ineffective portion) | 0 | 0 | 0 | 0
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) | (11) | 27 | (87) | 54
Commodity & Other |  |  |  |
AOCI to be recognized in next 12 months table |  |  |  |
Accumulated Other Comprehensive Income Loss Before Tax Expected Increase Decrease Next Twelve Months | (9) |  | (9) |
Gain Loss By Type Of Derivative Tables |  |  |  |
Gains (Losses) Recognized in AOCL | (4) | 0 | (11) | 0
Commodity & Other | Non-regulated revenue |  |  |  |
Gain Loss By Type Of Derivative Tables |  |  |  |
Gains (Losses) Reclassified from AOCL into Earnings | 0 | (2) | (2) | (2)
Gains (Losses) Recognized in Earnings (ineffective portion) | 0 | 0 | 0 | 0
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) | 14 | (54) | 15 | (63)
Commodity & Other | Non-regulated cost of sales |  |  |  |
Gain Loss By Type Of Derivative Tables |  |  |  |
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) | 1 | 3 | 4 | 2
Commodity & Other | Regulated Revenue [Member] |  |  |  |
Gain Loss By Type Of Derivative Tables |  |  |  |
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) | (3) | 0 | (2) | 0
Commodity & Other | Regulated Cost Of Sales [Member] |  |  |  |
Gain Loss By Type Of Derivative Tables |  |  |  |
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) | $ (3) | $ 0 | $ (20) | $ 0

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- Definition The pre-tax accumulated other comprehensive income (loss) expected to be recognized as an increase (decrease) to income from continuing operations before income taxes over the next twelve months as of the balance sheet date. + References No definition available. + Details
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- Definition The pre-tax gains (losses), net of noncontrolling interests, reclassified into earnings as a result of the discontinuance of a cash flow hedge because it was probable that the forecasted transaction would not occur by the end of the originally specified time period. + References No definition available. + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -Clause 4 -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 205G -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 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624177-113959 + Details
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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 Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -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 Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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