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Derivative Instruments and Hedging Activities - Part 3 (Details) - USD ($)

3 Months Ended

6 Months Ended

Jun. 30, 2015

Jun. 30, 2014

Jun. 30, 2015

Jun. 30, 2014

Derivative Instruments Gain Loss [Line Items]

Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net

$ (8,000,000)

$ (23,000,000)

$ (22,000,000)

$ (45,000,000)

Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax

0

(13,000,000)

0

(56,000,000)

^[1]

Gain Loss By Type Of Derivative Tables

Gain (Losses) Recognized in AOCL

102,000,000

(127,000,000)

13,000,000

(271,000,000)

Electric Production Expense

1,470,000,000

1,648,000,000

2,926,000,000

3,184,000,000

Gains (Losses) Recognized in Earnings (ineffective portion)

(1,000,000)

0

(3,000,000)

0

Gains (Losses) Recognized in Earnings (not designated as hedging instruments)

7,000,000

90,000,000

31,000,000

99,000,000

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

6,000,000

0

6,000,000

Interest Rate Contract [Member]

Gain Loss By Type Of Derivative Tables

Gain (Losses) Recognized in AOCL

94,000,000

(124,000,000)

(4,000,000)

(274,000,000)

AOCI to be recognized in next 12 months table

Accumulated Other Comprehensive Income Loss Before Tax Expected Increase Decrease Next Twelve Months

(123,000,000)

(123,000,000)

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

(15,000,000)

(33,000,000)

(39,000,000)

(64,000,000)

Gain Loss By Type Of Derivative Tables

Gains (Losses) Recognized in Earnings (ineffective portion)

(1,000,000)

1,000,000

(1,000,000)

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)

0

(1,000,000)

(1,000,000)

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

0

(2,000,000)

0

(3,000,000)

Cross currency derivatives [Member]

Gain Loss By Type Of Derivative Tables

Gain (Losses) Recognized in AOCL

1,000,000

0

1,000,000

(3,000,000)

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

0

2,000,000

(1,000,000)

1,000,000

Gain Loss By Type Of Derivative Tables

Gains (Losses) Recognized in Earnings (ineffective portion)

0

(1,000,000)

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

4,000,000

0

(6,000,000)

Foreign currency derivatives [Member]

Gain Loss By Type Of Derivative Tables

Gain (Losses) Recognized in AOCL

(1,000,000)

3,000,000

1,000,000

(12,000,000)

AOCI to be recognized in next 12 months table

Accumulated Other Comprehensive Income Loss Before Tax Expected Increase Decrease Next Twelve Months

8,000,000

8,000,000

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

2,000,000

3,000,000

8,000,000

10,000,000

Gain Loss By Type Of Derivative Tables

Gains (Losses) Recognized in Earnings (ineffective portion)

0

0

(2,000,000)

0

Gains (Losses) Recognized in Earnings (not designated as hedging instruments)

7,000,000

6,000,000

39,000,000

29,000,000

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

5,000,000

Commodity Contract [Member]

Gain Loss By Type Of Derivative Tables

Gain (Losses) Recognized in AOCL

8,000,000

(6,000,000)

15,000,000

18,000,000

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)

(3,000,000)

(4,000,000)

(1,000,000)

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

10,000,000

6,000,000

15,000,000

19,000,000

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

12,000,000

12,000,000

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)

0

2,000,000

1,000,000

2,000,000

Other derivative Contract [Member] | Non-regulated revenue [Member]

Gain Loss By Type Of Derivative Tables

Gains (Losses) Recognized in Earnings (not designated as hedging instruments)

1,000,000

1,000,000

(4,000,000)

4,000,000

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)

(1,000,000)

2,000,000

(5,000,000)

(6,000,000)

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

(2,000,000)

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

72,000,000

0

72,000,000

Other derivative Contract [Member] | Regulated Revenue [Member]

Gain Loss By Type Of Derivative Tables

Gains (Losses) Recognized in Earnings (not designated as hedging instruments)

0

0

0

0

Unrealized Derivative Losses, Net [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]

Gain Loss By Type Of Derivative Tables

Electric Production Expense

^[2]

$ (5,000,000)

$ (3,000,000)

$ (5,000,000)

$ (2,000,000)

[1]	Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 (in millions)Revenue$— $104 $— $233Income from operations of discontinued businesses, before income tax$— $15 $— $49Income tax expense— (8) — (22)Income from operations of discontinued businesses, after income tax$— $7 $— $27Net loss from disposal & impairments of discontinued businesses, after income tax$— $(13) $— $(56)
[2]	Amounts in parentheses indicate debits to the Condensed Consolidated Statements of Operations.

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