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Derivative Instruments and Hedging Activities - Part 3 (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Gain Loss By Type Of Derivative Tables |  |
Gains (Losses) Recognized in AOCL | $ (16) | $ 25
Gains (Losses) Reclassified from AOCL into Earnings | (31) | (114)
Gains (Losses) Recognized in Earnings (ineffective portion) | (1) | (1)
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) | (25) | (31)
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 | (146) |
Gain Loss By Type Of Derivative Tables |  |
Gains (Losses) Recognized in AOCL | (13) | 11
Interest Rate Derivatives | Interest Expense [Member] |  |
Gain Loss By Type Of Derivative Tables |  |
Gains (Losses) Reclassified from AOCL into Earnings | (32) | (32)
Gains (Losses) Recognized in Earnings (ineffective portion) | (1) | (1)
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) | 1 | (2)
Interest Rate Derivatives | Non-regulated cost of sales |  |
Gain Loss By Type Of Derivative Tables |  |
Gains (Losses) Reclassified from AOCL into Earnings | (1) | (2)
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)
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) | (6) | 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 | (92)
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 | (11) |
Gain Loss By Type Of Derivative Tables |  |
Gains (Losses) Recognized in AOCL | 1 | 14
Cross Currency Swaps | Interest Expense [Member] |  |
Gain Loss By Type Of Derivative Tables |  |
Gains (Losses) Reclassified from AOCL into Earnings | (3) | (3)
Cross Currency Swaps | Foreign currency transaction gains (losses) [Member] |  |
Gain Loss By Type Of Derivative Tables |  |
Gains (Losses) Reclassified from AOCL into Earnings | 5 | 18
Foreign Currency |  |
AOCI to be recognized in next 12 months table |  |
Accumulated Other Comprehensive Income Loss Before Tax Expected Increase Decrease Next Twelve Months | (6) |
Gain Loss By Type Of Derivative Tables |  |
Gains (Losses) Recognized in AOCL | 1 | 6
Foreign Currency | Foreign currency transaction gains (losses) [Member] |  |
Gain Loss By Type Of Derivative Tables |  |
Gains (Losses) Reclassified from AOCL into Earnings | 2 | 0
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) | 6 | (38)
Foreign Currency | Net Equity In Earnings Of Affiliates [Member] |  |
Gain Loss By Type Of Derivative Tables |  |
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) | (3) | 0
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) |
Gain Loss By Type Of Derivative Tables |  |
Gains (Losses) Recognized in AOCL | (5) | (6)
Commodity & Other | Non-regulated revenue |  |
Gain Loss By Type Of Derivative Tables |  |
Gains (Losses) Reclassified from AOCL into Earnings | 0 | (2)
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) | (21) | 14
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
Commodity & Other | Regulated Revenue [Member] |  |
Gain Loss By Type Of Derivative Tables |  |
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) | (3) | (4)
Commodity & Other | Regulated Cost Of Sales [Member] |  |
Gain Loss By Type Of Derivative Tables |  |
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) | $ 0 | $ (4)

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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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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -Clause 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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