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Derivative Instruments and Hedging Activities - Part 3 (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Gain Loss By Type Of Derivative Tables
Gains (Losses) Recognized in AOCL	$ (169)	$ (487)	$ (298)
Gains (Losses) Reclassified from AOCL into Earnings	(233)	(159)	(203)
Gains (Losses) Recognized in Earnings (ineffective portion)	(4)	(12)	(10)
Gains (Losses) Recognized in Earnings (not designated as hedging instruments)	(149)	(20)	(12)
Interest Rate Derivatives
Gain Loss By Type Of Derivative Tables
Gains (Losses) Recognized in AOCL	(175)	(475)	(288)
Interest Rate Derivatives | Interest Expense [Member]
Gain Loss By Type Of Derivative Tables
Gains (Losses) Reclassified from AOCL into Earnings	(135)	(125)	(110)
Gains (Losses) Recognized in Earnings (ineffective portion)	(2)	(6)	(15)
Gains (Losses) Recognized in Earnings (not designated as hedging instruments)	(5)	(4)	(9)
Interest Rate Derivatives | Non-regulated cost of sales
Gain Loss By Type Of Derivative Tables
Gains (Losses) Reclassified from AOCL into Earnings	(6)	(3)	(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	(7)	(4)	(1)
Gains (Losses) Recognized in Earnings (ineffective portion)	(1)	(2)	0
Interest Rate Derivatives | Asset Impairment Expense [Member]
Gain Loss By Type Of Derivative Tables
Gains (Losses) Reclassified from AOCL into Earnings	(6)	0	0
Interest Rate Derivatives | Discontinued Operations [Member]
Gain Loss By Type Of Derivative Tables
Gains (Losses) Reclassified from AOCL into Earnings	0	0	(113)
Interest Rate Derivatives | Gain on sale of investments [Member]
Gain Loss By Type Of Derivative Tables
Gains (Losses) Reclassified from AOCL into Earnings	(96)	0	0
Cross Currency Swaps
Gain Loss By Type Of Derivative Tables
Gains (Losses) Recognized in AOCL	4	(36)	15
Cross Currency Swaps | Interest Expense [Member]
Gain Loss By Type Of Derivative Tables
Gains (Losses) Reclassified from AOCL into Earnings	(12)	(10)	(4)
Gains (Losses) Recognized in Earnings (ineffective portion)	(1)	(4)	5
Cross Currency Swaps | Foreign currency transaction gains (losses) [Member]
Gain Loss By Type Of Derivative Tables
Gains (Losses) Reclassified from AOCL into Earnings	26	(16)	25
Foreign Currency Options and Forwards
Gain Loss By Type Of Derivative Tables
Gains (Losses) Recognized in AOCL	10	24	(16)
Foreign Currency Options and Forwards | Foreign currency transaction gains (losses) [Member]
Gain Loss By Type Of Derivative Tables
Gains (Losses) Reclassified from AOCL into Earnings	5	1	(8)
Gains (Losses) Recognized in Earnings (not designated as hedging instruments)	(141)	60	(35)
Foreign Currency Options and Forwards | Net Equity In Earnings Of Affiliates [Member]
Gain Loss By Type Of Derivative Tables
Gains (Losses) Recognized in Earnings (not designated as hedging instruments)	0	0	(2)
Commodity & Other
Gain Loss By Type Of Derivative Tables
Gains (Losses) Recognized in AOCL	(8)	0	(9)
Commodity & Other | Non-regulated revenue
Gain Loss By Type Of Derivative Tables
Gains (Losses) Reclassified from AOCL into Earnings	(2)	0	1
Gains (Losses) Recognized in Earnings (not designated as hedging instruments)	20	(63)	29
Commodity & Other | Non-regulated cost of sales
Gain Loss By Type Of Derivative Tables
Gains (Losses) Reclassified from AOCL into Earnings	0	(2)	0
Gains (Losses) Recognized in Earnings (not designated as hedging instruments)	2	(9)	5
Commodity & Other | Discontinued Operations [Member]
Gain Loss By Type Of Derivative Tables
Gains (Losses) Reclassified from AOCL into Earnings	0	0	10
Commodity & Other | Regulated Revenue [Member]
Gain Loss By Type Of Derivative Tables
Gains (Losses) Recognized in Earnings (not designated as hedging instruments)	(10)	1	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)	$ (15)	$ (5)	$ 0

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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-Name Statement of Financial Accounting Standard (FAS)

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-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.



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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.

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-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.



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-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.



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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.

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-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.



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Net gain (loss) from the increase (decrease) in fair value of derivative instrument not designated as hedging instrument.

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