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Guarantees of Debt (Tables)
 6 Months Ended
Jun. 30, 2016
Power [Member]  
Debt Instrument [Line Items]  
Schedule Of Financial Statements Of Guarantors
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Power
 
Guarantor
Subsidiaries
 
Other
Subsidiaries
 
Consolidating
Adjustments
 
Total
 
 
 
Millions
 
 
Three Months Ended June 30, 2016
 
 
 
 
 
 
 
 
 
 
 
Operating Revenues
$
—

 
$
700

 
$
46

 
$
(32
)
 
$
714

 
 
Operating Expenses
2

 
716

 
40

 
(32
)
 
726

 
 
Operating Income (Loss)
(2
)
 
(16
)
 
6

 
—

 
(12
)
 
 
Equity Earnings (Losses) of Subsidiaries
(1
)
 
1

 
4

 
—

 
4

 
 
Other Income
17

 
30

 
—

 
(22
)
 
25

 
 
Other Deductions
—

 
(9
)
 
—

 
—

 
(9
)
 
 
Other-Than-Temporary Impairments
—

 
(10
)
 
—

 
—

 
(10
)
 
 
Interest Expense
(31
)
 
(7
)
 
(4
)
 
22

 
(20
)
 
 
Income Tax Benefit (Expense)
6

 
3

 
2

 
—

 
11

 
 
Net Income (Loss)
$
(11
)
 
$
(8
)
 
$
8

 
$
—

 
$
(11
)
 
 
Comprehensive Income (Loss)
$
5

 
$
1

 
$
8

 
$
(9
)
 
$
5

 
 
Six Months Ended June 30, 2016
 
 
 
 
 
 
 
 
 
 
 
Operating Revenues
$
—

 
$
2,002

 
$
88

 
$
(63
)
 
$
2,027

 
 
Operating Expenses
12

 
1,668

 
79

 
(63
)
 
1,696

 
 
Operating Income (Loss)
(12
)
 
334

 
9

 
—

 
331

 
 
Equity Earnings (Losses) of Subsidiaries
204

 
—

 
6

 
(204
)
 
6

 
 
Other Income
34

 
62

 
—

 
(45
)
 
51

 
 
Other Deductions
—

 
(27
)
 
—

 
—

 
(27
)
 
 
Other-Than-Temporary Impairments
—

 
(20
)
 
—

 
—

 
(20
)
 
 
Interest Expense
(61
)
 
(17
)
 
(9
)
 
45

 
(42
)
 
 
Income Tax Benefit (Expense)
16

 
(137
)
 
3

 
—

 
(118
)
 
 
Net Income (Loss)
$
181

 
$
195

 
$
9

 
$
(204
)
 
$
181

 
 
Comprehensive Income (Loss)
$
220

 
$
220

 
$
9

 
$
(229
)
 
$
220

 
 
Six Months Ended June 30, 2016
 
 
 
 
 
 
 
 
 
 
 
Net Cash Provided By (Used In)
   Operating Activities
$
337

 
$
777

 
$
159

 
$
(356
)
 
$
917

 
 
Net Cash Provided By (Used In)
   Investing Activities
$
(1,287
)
 
$
(504
)
 
$
(395
)
 
$
579

 
$
(1,607
)
 
 
Net Cash Provided By (Used In)
   Financing Activities
$
951

 
$
(273
)
 
$
239

 
$
(223
)
 
$
694

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Power
 
Guarantor
Subsidiaries
 
Other
Subsidiaries
 
Consolidating
Adjustments
 
Total
 
 
 
Millions
 
 
Three Months Ended June 30, 2015
 
 
 
 
 
 
 
 
 
 
 
Operating Revenues
$
—

 
$
1,012

 
$
39

 
$
(26
)
 
$
1,025

 
 
Operating Expenses
(1
)
 
787

 
37

 
(26
)
 
797

 
 
Operating Income (Loss)
1

 
225

 
2

 
—

 
228

 
 
Equity Earnings (Losses) of Subsidiaries
186

 
(1
)
 
5

 
(185
)
 
5

 
 
Other Income
12

 
55

 
—

 
(12
)
 
55

 
 
Other Deductions
(1
)
 
(6
)
 
—

 
—

 
(7
)
 
 
Other-Than-Temporary
   Impairments
—

 
(10
)
 
—

 
—

 
(10
)
 
 
Interest Expense
(33
)
 
(7
)
 
(5
)
 
12

 
(33
)
 
 
Income Tax Benefit (Expense)
1

 
(73
)
 
—

 
—

 
(72
)
 
 
Net Income (Loss)
$
166

 
$
183

 
$
2

 
$
(185
)
 
$
166

 
 
Comprehensive Income (Loss)
$
159

 
$
169

 
$
2

 
$
(171
)
 
$
159

 
 
Six Months Ended June 30, 2015
 
 
 
 
 
 
 
 
 
 
 
Operating Revenues
$
—

 
$
2,727

 
$
107

 
$
(84
)
 
$
2,750

 
 
Operating Expenses
4

 
1,918

 
100

 
(84
)
 
1,938

 
 
Operating Income (Loss)
(4
)
 
809

 
7

 
—

 
812

 
 
Equity Earnings (Losses) of Subsidiaries
535

 
(2
)
 
8

 
(533
)
 
8

 
 
Other Income
23

 
85

 
—

 
(24
)
 
84

 
 
Other Deductions
(1
)
 
(17
)
 
—

 
—

 
(18
)
 
 
Other-Than-Temporary Impairments
—

 
(15
)
 
—

 
—

 
(15
)
 
 
Interest Expense
(62
)
 
(16
)
 
(10
)
 
24

 
(64
)
 
 
Income Tax Benefit (Expense)
10

 
(315
)
 
(1
)
 
—

 
(306
)
 
 
Net Income (Loss)
$
501

 
$
529

 
$
4

 
$
(533
)
 
$
501

 
 
Comprehensive Income (Loss)
$
506

 
$
520

 
$
4

 
$
(524
)
 
$
506

 
 
Six Months Ended June 30, 2015
 
 
 
 
 
 
 
 
 
 
 
Net Cash Provided By (Used In)
   Operating Activities
$
410

 
$
1,508

 
$
61

 
$
(687
)
 
$
1,292

 
 
Net Cash Provided By (Used In)
   Investing Activities
$
(480
)
 
$
(963
)
 
$
(210
)
 
$
766

 
$
(887
)
 
 
Net Cash Provided By (Used In)
   Financing Activities
$
70

 
$
(543
)
 
$
150

 
$
(79
)
 
$
(402
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Power
 
Guarantor
Subsidiaries
 
Other
Subsidiaries
 
Consolidating
Adjustments
 
Total
 
 
 
Millions
 
 
As of June 30, 2016
 
 
 
 
 
 
 
 
 
 
 
Current Assets
$
5,490

 
$
1,655

 
$
231

 
$
(4,828
)
 
$
2,548

 
 
Property, Plant and Equipment, net
58

 
6,476

 
1,944

 
—

 
8,478

 
 
Investment in Subsidiaries
4,419

 
345

 
—

 
(4,764
)
 
—

 
 
Noncurrent Assets
134

 
2,041

 
128

 
(51
)
 
2,252

 
 
Total Assets
$
10,101

 
$
10,517

 
$
2,303

 
$
(9,643
)
 
$
13,278

 
 
Current Liabilities
$
1,079

 
$
3,719

 
$
1,293

 
$
(4,828
)
 
$
1,263

 
 
Noncurrent Liabilities
420

 
2,652

 
392

 
(51
)
 
3,413

 
 
Long-Term Debt
2,380

 
—

 
—

 
—

 
2,380

 
 
Member's Equity
6,222

 
4,146

 
618

 
(4,764
)
 
6,222

 
 
Total Liabilities and Member's Equity
$
10,101

 
$
10,517

 
$
2,303

 
$
(9,643
)
 
$
13,278

 
 
As of December 31, 2015
 
 
 
 
 
 
 
 
 
 
 
Current Assets
$
4,501

 
$
1,912

 
$
364

 
$
(4,828
)
 
$
1,949

 
 
Property, Plant and Equipment, net
83

 
6,502

 
1,542

 
—

 
8,127

 
 
Investment in Subsidiaries
4,501

 
346

 
—

 
(4,847
)
 
—

 
 
Noncurrent Assets
155

 
1,959

 
136

 
(76
)
 
2,174

 
 
Total Assets
$
9,240

 
$
10,719

 
$
2,042

 
$
(9,751
)
 
$
12,250

 
 
Current Liabilities
$
1,112

 
$
3,866

 
$
1,076

 
$
(4,828
)
 
$
1,226

 
 
Noncurrent Liabilities
442

 
2,597

 
375

 
(76
)
 
3,338

 
 
Long-Term Debt
1,684

 
—

 
—

 
—

 
1,684

 
 
Member's Equity
6,002

 
4,256

 
591

 
(4,847
)
 
6,002

 
 
Total Liabilities and Member's Equity
$
9,240

 
$
10,719

 
$
2,042

 
$
(9,751
)
 
$
12,250