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Derivative Instruments and Hedging Activities - Part 3 (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ (14,000,000)	$ (54,000,000)	$ (52,000,000)	$ (99,000,000)
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	0	0	0	(56,000,000)
Gain Loss By Type Of Derivative Tables
Gain (Losses) Recognized in AOCL	(92,000,000)	(42,000,000)	(95,000,000)	(313,000,000)
Electric Production Expense	1,388,000,000	1,718,000,000	4,314,000,000	4,902,000,000
Gains (Losses) Recognized in Earnings (ineffective portion)	(2,000,000)	(2,000,000)	(6,000,000)	(2,000,000)
Gains (Losses) Recognized in Earnings (not designated as hedging instruments)	13,000,000	(17,000,000)	44,000,000	82,000,000
AOCI to be recognized in next 12 months table
Gain on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring	0	0	0	6,000,000
Interest Rate Contract [Member]
Gain Loss By Type Of Derivative Tables
Gain (Losses) Recognized in AOCL	(110,000,000)	(16,000,000)	(130,000,000)	(290,000,000)
AOCI to be recognized in next 12 months table
Accumulated Other Comprehensive Income Loss Before Tax Expected Increase Decrease Next Twelve Months	(106,000,000)		(106,000,000)
Interest Rate Contract [Member] | Interest Expense [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(27,000,000)	(38,000,000)	(81,000,000)	(102,000,000)
Gain Loss By Type Of Derivative Tables
Gains (Losses) Recognized in Earnings (ineffective portion)	(2,000,000)	(1,000,000)	(3,000,000)	0
Gains (Losses) Recognized in Earnings (not designated as hedging instruments)	0	(1,000,000)	0	(1,000,000)
Interest Rate Contract [Member] | Non-regulated cost of sales [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(1,000,000)	(1,000,000)	(2,000,000)	(2,000,000)
Interest Rate Contract [Member] | Net Equity In Earnings Of Affiliates [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(1,000,000)	0	(1,000,000)	(3,000,000)
Cash Flow Hedging [Member] | Interest Rate Contract [Member] | Nonoperating Income (Expense) [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(4,000,000)	0
Cross currency derivatives [Member]
Gain Loss By Type Of Derivative Tables
Gain (Losses) Recognized in AOCL	3,000,000	(17,000,000)	4,000,000	(20,000,000)
AOCI to be recognized in next 12 months table
Accumulated Other Comprehensive Income Loss Before Tax Expected Increase Decrease Next Twelve Months	(5,000,000)		(5,000,000)
Cross currency derivatives [Member] | Interest Expense [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(1,000,000)	(1,000,000)	(3,000,000)	0
Gain Loss By Type Of Derivative Tables
Gains (Losses) Recognized in Earnings (ineffective portion)	0	0	0	(1,000,000)
Cross currency derivatives [Member] | Foreign currency transaction gains (losses) [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	0	(18,000,000)	0	(24,000,000)
Foreign currency derivatives [Member]
Gain Loss By Type Of Derivative Tables
Gain (Losses) Recognized in AOCL	5,000,000	(12,000,000)	6,000,000	(24,000,000)
AOCI to be recognized in next 12 months table
Accumulated Other Comprehensive Income Loss Before Tax Expected Increase Decrease Next Twelve Months	13,000,000		13,000,000
Foreign currency derivatives [Member] | Foreign currency transaction gains (losses) [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	12,000,000	1,000,000	20,000,000	11,000,000
Gain Loss By Type Of Derivative Tables
Gains (Losses) Recognized in Earnings (ineffective portion)	0	(2,000,000)	(3,000,000)	(2,000,000)
Gains (Losses) Recognized in Earnings (not designated as hedging instruments)	23,000,000	2,000,000	62,000,000	31,000,000
Foreign currency derivatives [Member] | 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	(9,000,000)	0	(4,000,000)
Commodity Contract [Member]
Gain Loss By Type Of Derivative Tables
Gain (Losses) Recognized in AOCL	10,000,000	3,000,000	25,000,000	21,000,000
Commodity Contract [Member] | Non-regulated cost of sales [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(4,000,000)	(1,000,000)	(8,000,000)	(2,000,000)
Commodity Contract [Member] | Non-regulated revenue [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	12,000,000	4,000,000	27,000,000	23,000,000
Other derivative Contract [Member]
AOCI to be recognized in next 12 months table
Accumulated Other Comprehensive Income Loss Before Tax Expected Increase Decrease Next Twelve Months	14,000,000		14,000,000
Other derivative Contract [Member] | Non-regulated cost of sales [Member]
Gain Loss By Type Of Derivative Tables
Gains (Losses) Recognized in Earnings (not designated as hedging instruments)	(8,000,000)	(3,000,000)	(7,000,000)	(1,000,000)
Other derivative Contract [Member] | Non-regulated revenue [Member]
Gain Loss By Type Of Derivative Tables
Gains (Losses) Recognized in Earnings (ineffective portion)	0	1,000,000	0	1,000,000
Gains (Losses) Recognized in Earnings (not designated as hedging instruments)	(2,000,000)	(2,000,000)	(6,000,000)	2,000,000
Other derivative Contract [Member] | Regulated Cost Of Sales [Member]
Gain Loss By Type Of Derivative Tables
Gains (Losses) Recognized in Earnings (not designated as hedging instruments)	0	(4,000,000)	(5,000,000)	(10,000,000)
Other derivative Contract [Member] | Income (Loss) From Operations Of Discontinued Business [Member]
Gain Loss By Type Of Derivative Tables
Gains (Losses) Recognized in Earnings (not designated as hedging instruments)	0	0	0	(7,000,000)
Other derivative Contract [Member] | Net Loss from Disposal and Impairments of Discontinued Business [Member]
Gain Loss By Type Of Derivative Tables
Gains (Losses) Recognized in Earnings (not designated as hedging instruments)	$ 0	$ 0	$ 0	$ 72,000,000

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