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Guarantees of Debt (Tables)
 9 Months Ended
Sep. 30, 2015
Power [Member]  
Debt Instrument [Line Items]  
Schedule Of Financial Statements Of Guarantors
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Power
 
Guarantor
Subsidiaries
 
Other
Subsidiaries
 
Consolidating
Adjustments
 
Consolidated
 
 
 
Millions
 
 
Three Months Ended September 30, 2015
 
 
 
 
 
 
 
 
 
 
 
Operating Revenues
$
—

 
$
1,084

 
$
37

 
$
(25
)
 
$
1,096

 
 
Operating Expenses
3

 
692

 
35

 
(25
)
 
705

 
 
Operating Income (Loss)
(3
)
 
392

 
2

 
—

 
391

 
 
Equity Earnings (Losses) of Subsidiaries
220

 
(2
)
 
3

 
(218
)
 
3

 
 
Other Income
10

 
26

 
—

 
(11
)
 
25

 
 
Other Deductions
—

 
(14
)
 
—

 
—

 
(14
)
 
 
Other-Than-Temporary Impairments
—

 
(30
)
 
—

 
—

 
(30
)
 
 
Interest Expense
(28
)
 
(8
)
 
(5
)
 
11

 
(30
)
 
 
Income Tax Benefit (Expense)
7

 
(148
)
 
2

 
—

 
(139
)
 
 
Net Income (Loss)
$
206

 
$
216

 
$
2

 
$
(218
)
 
$
206

 
 
Comprehensive Income (Loss)
$
184

 
$
187

 
$
2

 
$
(189
)
 
$
184

 
 
Nine Months Ended September 30, 2015
 
 
 
 
 
 
 
 
 
 
 
Operating Revenues
$
—

 
$
3,811

 
$
144

 
$
(109
)
 
$
3,846

 
 
Operating Expenses
7

 
2,610

 
135

 
(109
)
 
2,643

 
 
Operating Income (Loss)
(7
)
 
1,201

 
9

 
—

 
1,203

 
 
Equity Earnings (Losses) of Subsidiaries
755

 
(4
)
 
11

 
(751
)
 
11

 
 
Other Income
33

 
111

 
—

 
(35
)
 
109

 
 
Other Deductions
(1
)
 
(31
)
 
—

 
—

 
(32
)
 
 
Other-Than-Temporary Impairments
—

 
(45
)
 
—

 
—

 
(45
)
 
 
Interest Expense
(90
)
 
(24
)
 
(15
)
 
35

 
(94
)
 
 
Income Tax Benefit (Expense)
17

 
(463
)
 
1

 
—

 
(445
)
 
 
Net Income (Loss)
$
707

 
$
745

 
$
6

 
$
(751
)
 
$
707

 
 
Comprehensive Income (Loss)
$
690

 
$
707

 
$
6

 
$
(713
)
 
$
690

 
 
Nine Months Ended September 30, 2015
 
 
 
 
 
 
 
 
 
 
 
Net Cash Provided By (Used In)
   Operating Activities
$
435

 
$
1,826

 
$
66

 
$
(769
)
 
$
1,558

 
 
Net Cash Provided By (Used In)
   Investing Activities
$
(656
)
 
$
(1,382
)
 
$
(303
)
 
$
1,191

 
$
(1,150
)
 
 
Net Cash Provided By (Used In)
   Financing Activities
$
221

 
$
(446
)
 
$
245

 
$
(422
)
 
$
(402
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Power
 
Guarantor
Subsidiaries
 
Other
Subsidiaries
 
Consolidating
Adjustments
 
Consolidated
 
 
 
Millions
 
 
Three Months Ended September 30, 2014
 
 
 
 
 
 
 
 
 
 
 
Operating Revenues
$
—

 
$
1,125

 
$
36

 
$
(23
)
 
$
1,138

 
 
Operating Expenses
3

 
772

 
32

 
(22
)
 
785

 
 
Operating Income (Loss)
(3
)
 
353

 
4

 
(1
)
 
353

 
 
Equity Earnings (Losses) of Subsidiaries
225

 
(1
)
 
4

 
(224
)
 
4

 
 
Other Income
9

 
55

 
—

 
(8
)
 
56

 
 
Other Deductions
(3
)
 
(4
)
 
—

 
1

 
(6
)
 
 
Other-Than-Temporary
   Impairments
—

 
(10
)
 
—

 
—

 
(10
)
 
 
Interest Expense
(24
)
 
(10
)
 
(4
)
 
7

 
(31
)
 
 
Income Tax Benefit (Expense)
18

 
(161
)
 
(1
)
 
—

 
(144
)
 
 
Net Income (Loss)
$
222

 
$
222

 
$
3

 
$
(225
)
 
$
222

 
 
Comprehensive Income (Loss)
$
195

 
$
191

 
$
3

 
$
(194
)
 
$
195

 
 
Nine Months Ended September 30, 2014
 
 
 
 
 
 
 
 
 
 
 
Operating Revenues
$
—

 
$
3,781

 
$
118

 
$
(75
)
 
$
3,824

 
 
Operating Expenses
12

 
3,079

 
106

 
(75
)
 
3,122

 
 
Operating Income (Loss)
(12
)
 
702

 
12

 
—

 
702

 
 
Equity Earnings (Losses) of Subsidiaries
459

 
(4
)
 
11

 
(455
)
 
11

 
 
Other Income
25

 
135

 
—

 
(25
)
 
135

 
 
Other Deductions
(7
)
 
(18
)
 
—

 
—

 
(25
)
 
 
Other-Than-Temporary Impairments
—

 
(14
)
 
—

 
—

 
(14
)
 
 
Interest Expense
(79
)
 
(23
)
 
(14
)
 
24

 
(92
)
 
 
Income Tax Benefit (Expense)
54

 
(329
)
 
(2
)
 
—

 
(277
)
 
 
Net Income (Loss)
$
440

 
$
449

 
$
7

 
$
(456
)
 
$
440

 
 
Comprehensive Income (Loss)
$
432

 
$
433

 
$
7

 
$
(440
)
 
$
432

 
 
Nine Months Ended September 30, 2014
 
 
 
 
 
 
 
 
 
 
 
Net Cash Provided By (Used In)
   Operating Activities
$
471

 
$
1,252

 
$
53

 
$
(666
)
 
$
1,110

 
 
Net Cash Provided By (Used In)
   Investing Activities
$
187

 
$
(559
)
 
$
(24
)
 
$
70

 
$
(326
)
 
 
Net Cash Provided By (Used In)
   Financing Activities
$
(652
)
 
$
(693
)
 
$
(29
)
 
$
596

 
$
(778
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Power
 
Guarantor
Subsidiaries
 
Other
Subsidiaries
 
Consolidating
Adjustments
 
Consolidated
 
 
 
Millions
 
 
As of September 30, 2015
 
 
 
 
 
 
 
 
 
 
 
Current Assets
$
4,678

 
$
1,786

 
$
134

 
$
(4,374
)
 
$
2,224

 
 
Property, Plant and Equipment, net
82

 
6,390

 
1,435

 
—

 
7,907

 
 
Investment in Subsidiaries
4,555

 
349

 
—

 
(4,904
)
 
—

 
 
Noncurrent Assets
264

 
1,962

 
133

 
(176
)
 
2,183

 
 
Total Assets
$
9,579

 
$
10,487

 
$
1,702

 
$
(9,454
)
 
$
12,314

 
 
Current Liabilities
$
1,581

 
$
3,595

 
$
772

 
$
(4,374
)
 
$
1,574

 
 
Noncurrent Liabilities
458

 
2,563

 
355

 
(176
)
 
3,200

 
 
Long-Term Debt
1,691

 
—

 
—

 
—

 
1,691

 
 
Member's Equity
5,849

 
4,329

 
575

 
(4,904
)
 
5,849

 
 
Total Liabilities and Member's Equity
$
9,579

 
$
10,487

 
$
1,702

 
$
(9,454
)
 
$
12,314

 
 
As of December 31, 2014
 
 
 
 
 
 
 
 
 
 
 
Current Assets
$
4,263

 
$
2,037

 
$
150

 
$
(4,091
)
 
$
2,359

 
 
Property, Plant and Equipment, net
81

 
6,265

 
1,169

 
—

 
7,515

 
 
Investment in Subsidiaries
4,516

 
120

 
—

 
(4,636
)
 
—

 
 
Noncurrent Assets
278

 
1,952

 
137

 
(195
)
 
2,172

 
 
Total Assets
$
9,138

 
$
10,374

 
$
1,456

 
$
(8,922
)
 
$
12,046

 
 
Current Liabilities
$
883

 
$
3,606

 
$
786

 
$
(4,091
)
 
$
1,184

 
 
Noncurrent Liabilities
454

 
2,442

 
360

 
(195
)
 
3,061

 
 
Long-Term Debt
2,243

 
—

 
—

 
—

 
2,243

 
 
Member's Equity
5,558

 
4,326

 
310

 
(4,636
)
 
5,558

 
 
Total Liabilities and Member's Equity
$
9,138

 
$
10,374

 
$
1,456

 
$
(8,922
)
 
$
12,046