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Guarantees of Debt (Tables)
 9 Months Ended
Sep. 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 September 30, 2016
 
 
 
 
 
 
 
 
 
 
 
Operating Revenues
$
—

 
$
1,059

 
$
43

 
$
(27
)
 
$
1,075

 
 
Operating Expenses
(2
)
 
826

 
40

 
(27
)
 
837

 
 
Operating Income (Loss)
2

 
233

 
3

 
—

 
238

 
 
Equity Earnings (Losses) of Subsidiaries
143

 
(1
)
 
3

 
(142
)
 
3

 
 
Other Income
18

 
26

 
—

 
(21
)
 
23

 
 
Other Deductions
(2
)
 
(4
)
 
—

 
—

 
(6
)
 
 
Other-Than-Temporary Impairments
—

 
(5
)
 
—

 
—

 
(5
)
 
 
Interest Expense
(30
)
 
(12
)
 
(3
)
 
21

 
(24
)
 
 
Income Tax Benefit (Expense)
8

 
(97
)
 
(1
)
 
—

 
(90
)
 
 
Net Income (Loss)
$
139

 
$
140

 
$
2

 
$
(142
)
 
$
139

 
 
Comprehensive Income (Loss)
$
168

 
$
161

 
$
2

 
$
(163
)
 
$
168

 
 
Nine Months Ended September 30, 2016
 
 
 
 
 
 
 
 
 
 
 
Operating Revenues
$
—

 
$
3,061

 
$
131

 
$
(90
)
 
$
3,102

 
 
Operating Expenses
10

 
2,494

 
119

 
(90
)
 
2,533

 
 
Operating Income (Loss)
(10
)
 
567

 
12

 
—

 
569

 
 
Equity Earnings (Losses) of Subsidiaries
347

 
(1
)
 
9

 
(346
)
 
9

 
 
Other Income
52

 
88

 
—

 
(66
)
 
74

 
 
Other Deductions
(2
)
 
(31
)
 
—

 
—

 
(33
)
 
 
Other-Than-Temporary Impairments
—

 
(25
)
 
—

 
—

 
(25
)
 
 
Interest Expense
(91
)
 
(29
)
 
(12
)
 
66

 
(66
)
 
 
Income Tax Benefit (Expense)
24

 
(234
)
 
2

 
—

 
(208
)
 
 
Net Income (Loss)
$
320

 
$
335

 
$
11

 
$
(346
)
 
$
320

 
 
Comprehensive Income (Loss)
$
388

 
$
381

 
$
11

 
$
(392
)
 
$
388

 
 
Nine Months Ended September 30, 2016
 
 
 
 
 
 
 
 
 
 
 
Net Cash Provided By (Used In)
   Operating Activities
$
175

 
$
1,261

 
$
234

 
$
(410
)
 
$
1,260

 
 
Net Cash Provided By (Used In)
   Investing Activities
$
(588
)
 
$
(1,166
)
 
$
(549
)
 
$
1,152

 
$
(1,151
)
 
 
Net Cash Provided By (Used In)
   Financing Activities
$
413

 
$
(95
)
 
$
315

 
$
(742
)
 
$
(109
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Power
 
Guarantor
Subsidiaries
 
Other
Subsidiaries
 
Consolidating
Adjustments
 
Total
 
 
 
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
 
Total
 
 
 
Millions
 
 
As of September 30, 2016
 
 
 
 
 
 
 
 
 
 
 
Current Assets
$
4,889

 
$
1,845

 
$
287

 
$
(5,262
)
 
$
1,759

 
 
Property, Plant and Equipment, net
57

 
6,570

 
2,080

 
—

 
8,707

 
 
Investment in Subsidiaries
4,709

 
483

 
—

 
(5,192
)
 
—

 
 
Noncurrent Assets
157

 
2,140

 
123

 
(76
)
 
2,344

 
 
Total Assets
$
9,812

 
$
11,038

 
$
2,490

 
$
(10,530
)
 
$
12,810

 
 
Current Liabilities
$
818

 
$
3,888

 
$
1,350

 
$
(5,262
)
 
$
794

 
 
Noncurrent Liabilities
473

 
2,704

 
394

 
(76
)
 
3,495

 
 
Long-Term Debt
2,381

 
—

 
—

 
—

 
2,381

 
 
Member’s Equity
6,140

 
4,446

 
746

 
(5,192
)
 
6,140

 
 
Total Liabilities and Member’s Equity
$
9,812

 
$
11,038

 
$
2,490

 
$
(10,530
)
 
$
12,810

 
 
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