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Guarantees Of Debt (Schedule Of Financial Statements Of Guarantors) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |
Operating Revenues | $ 2,688 | $ 2,641 | $ 8,137 | $ 8,113 |
Operating Expenses | 1,874 | 1,895 | 5,707 | 6,297 |
Operating Income (Loss) | 814 | 746 | 2,430 | 1,816 |
Equity Earnings (Losses) of Subsidiaries | 3 | 3 | 10 | 10 |
Other Income | 47 | 75 | 171 | 185 |
Other Deductions | (14) | (9) | (36) | (31) |
Other-Than Temporary Impairments | 30 | 10 | 45 | 14 |
Interest Expense | (96) | (100) | (291) | (291) |
Income Tax Expense | (285) | (261) | (869) | (633) |
Net Income | 439 | 444 | 1,370 | 1,042 |
Net Cash Provided By (Used In) Operating Activities |  |  | 3,228 | 2,536 |
Net Cash Provided By (Used In) Investing Activities |  |  | (2,841) | (1,988) |
Net Cash Provided By (Used In) Financing Activities |  |  | (518) | (338) |
Current Assets | 3,204 |  | 3,204 |  | $ 4,119
Property, Plant and Equipment, net | 25,605 |  | 25,605 |  | 23,589
Noncurrent Assets | 7,615 |  | 7,615 |  | 7,625
Total Assets | 36,424 |  | 36,424 |  | 35,333
Current Liabilities | 3,604 |  | 3,604 |  | 3,478
Noncurrent Liabilities | 11,754 |  | 11,754 |  | 11,408
Long-Term Debt | 8,132 |  | 8,132 |  | 8,261
Member's Equity | 12,934 |  | 12,934 |  | 12,186
TOTAL LIABILITIES AND CAPITALIZATION | 36,424 |  | 36,424 |  | 35,333
Power Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Operating Revenues | 1,096 | 1,138 | 3,846 | 3,824 |
Operating Expenses | 705 | 785 | 2,643 | 3,122 |
Operating Income (Loss) | 391 | 353 | 1,203 | 702 |
Equity Earnings (Losses) of Subsidiaries | 3 | 4 | 11 | 11 |
Other Income | 25 | 56 | 109 | 135 |
Other Deductions | (14) | (6) | (32) | (25) |
Other-Than Temporary Impairments | 30 | 10 | 45 | 14 |
Interest Expense | (30) | (31) | (94) | (92) |
Income Tax Expense | (139) | (144) | (445) | (277) |
Net Income | 206 | 222 | 707 | 440 |
Comprehensive Income (Loss) | 184 | 195 | 690 | 432 |
Net Cash Provided By (Used In) Operating Activities |  |  | 1,558 | 1,110 |
Net Cash Provided By (Used In) Investing Activities |  |  | (1,150) | (326) |
Net Cash Provided By (Used In) Financing Activities |  |  | (402) | (778) |
Current Assets | 2,224 |  | 2,224 |  | 2,359
Property, Plant and Equipment, net | 7,907 |  | 7,907 |  | 7,515
Investment in Subsidiaries | 0 |  | 0 |  | 0
Noncurrent Assets | 2,183 |  | 2,183 |  | 2,172
Total Assets | 12,314 |  | 12,314 |  | 12,046
Current Liabilities | 1,574 |  | 1,574 |  | 1,184
Noncurrent Liabilities | 3,200 |  | 3,200 |  | 3,061
Long-Term Debt | 1,691 |  | 1,691 |  | 2,243
Member's Equity | 5,849 |  | 5,849 |  | 5,558
TOTAL LIABILITIES AND CAPITALIZATION | 12,314 |  | 12,314 |  | 12,046
Power Senior Notes [Member] | Power Parent [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Operating Revenues | 0 | 0 | 0 | 0 |
Operating Expenses | 3 | 3 | 7 | 12 |
Operating Income (Loss) | (3) | (3) | (7) | (12) |
Equity Earnings (Losses) of Subsidiaries | 220 | 225 | 755 | 459 |
Other Income | 10 | 9 | 33 | 25 |
Other Deductions | 0 | (3) | (1) | (7) |
Other-Than Temporary Impairments | 0 | 0 | 0 | 0 |
Interest Expense | (28) | (24) | (90) | (79) |
Income Tax Expense | 7 | 18 | 17 | 54 |
Net Income | 206 | 222 | 707 | 440 |
Comprehensive Income (Loss) | 184 | 195 | 690 | 432 |
Net Cash Provided By (Used In) Operating Activities |  |  | 435 | 471 |
Net Cash Provided By (Used In) Investing Activities |  |  | (656) | 187 |
Net Cash Provided By (Used In) Financing Activities |  |  | 221 | (652) |
Current Assets | 4,678 |  | 4,678 |  | 4,263
Property, Plant and Equipment, net | 82 |  | 82 |  | 81
Investment in Subsidiaries | 4,555 |  | 4,555 |  | 4,516
Noncurrent Assets | 264 |  | 264 |  | 278
Total Assets | 9,579 |  | 9,579 |  | 9,138
Current Liabilities | 1,581 |  | 1,581 |  | 883
Noncurrent Liabilities | 458 |  | 458 |  | 454
Long-Term Debt | 1,691 |  | 1,691 |  | 2,243
Member's Equity | 5,849 |  | 5,849 |  | 5,558
TOTAL LIABILITIES AND CAPITALIZATION | 9,579 |  | 9,579 |  | 9,138
Power Senior Notes [Member] | Guarantor Subsidiaries [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Operating Revenues | 1,084 | 1,125 | 3,811 | 3,781 |
Operating Expenses | 692 | 772 | 2,610 | 3,079 |
Operating Income (Loss) | 392 | 353 | 1,201 | 702 |
Equity Earnings (Losses) of Subsidiaries | (2) | (1) | (4) | (4) |
Other Income | 26 | 55 | 111 | 135 |
Other Deductions | (14) | (4) | (31) | (18) |
Other-Than Temporary Impairments | 30 | 10 | 45 | 14 |
Interest Expense | (8) | (10) | (24) | (23) |
Income Tax Expense | (148) | (161) | (463) | (329) |
Net Income | 216 | 222 | 745 | 449 |
Comprehensive Income (Loss) | 187 | 191 | 707 | 433 |
Net Cash Provided By (Used In) Operating Activities |  |  | 1,826 | 1,252 |
Net Cash Provided By (Used In) Investing Activities |  |  | (1,382) | (559) |
Net Cash Provided By (Used In) Financing Activities |  |  | (446) | (693) |
Current Assets | 1,786 |  | 1,786 |  | 2,037
Property, Plant and Equipment, net | 6,390 |  | 6,390 |  | 6,265
Investment in Subsidiaries | 349 |  | 349 |  | 120
Noncurrent Assets | 1,962 |  | 1,962 |  | 1,952
Total Assets | 10,487 |  | 10,487 |  | 10,374
Current Liabilities | 3,595 |  | 3,595 |  | 3,606
Noncurrent Liabilities | 2,563 |  | 2,563 |  | 2,442
Long-Term Debt | 0 |  | 0 |  | 0
Member's Equity | 4,329 |  | 4,329 |  | 4,326
TOTAL LIABILITIES AND CAPITALIZATION | 10,487 |  | 10,487 |  | 10,374
Power Senior Notes [Member] | Non-Guarantor Subsidiaries [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Operating Revenues | 37 | 36 | 144 | 118 |
Operating Expenses | 35 | 32 | 135 | 106 |
Operating Income (Loss) | 2 | 4 | 9 | 12 |
Equity Earnings (Losses) of Subsidiaries | 3 | 4 | 11 | 11 |
Other Income | 0 | 0 | 0 | 0 |
Other Deductions | 0 | 0 | 0 | 0 |
Other-Than Temporary Impairments | 0 | 0 | 0 | 0 |
Interest Expense | (5) | (4) | (15) | (14) |
Income Tax Expense | 2 | (1) | 1 | (2) |
Net Income | 2 | 3 | 6 | 7 |
Comprehensive Income (Loss) | 2 | 3 | 6 | 7 |
Net Cash Provided By (Used In) Operating Activities |  |  | 66 | 53 |
Net Cash Provided By (Used In) Investing Activities |  |  | (303) | (24) |
Net Cash Provided By (Used In) Financing Activities |  |  | 245 | (29) |
Current Assets | 134 |  | 134 |  | 150
Property, Plant and Equipment, net | 1,435 |  | 1,435 |  | 1,169
Investment in Subsidiaries | 0 |  | 0 |  | 0
Noncurrent Assets | 133 |  | 133 |  | 137
Total Assets | 1,702 |  | 1,702 |  | 1,456
Current Liabilities | 772 |  | 772 |  | 786
Noncurrent Liabilities | 355 |  | 355 |  | 360
Long-Term Debt | 0 |  | 0 |  | 0
Member's Equity | 575 |  | 575 |  | 310
TOTAL LIABILITIES AND CAPITALIZATION | 1,702 |  | 1,702 |  | 1,456
Power Senior Notes [Member] | Consolidating Adjustments [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Operating Revenues | (25) | (23) | (109) | (75) |
Operating Expenses | (25) | (22) | (109) | (75) |
Operating Income (Loss) | 0 | (1) | 0 | 0 |
Equity Earnings (Losses) of Subsidiaries | (218) | (224) | (751) | (455) |
Other Income | (11) | (8) | (35) | (25) |
Other Deductions | 0 | 1 | 0 | 0 |
Other-Than Temporary Impairments | 0 | 0 | 0 | 0 |
Interest Expense | 11 | 7 | 35 | 24 |
Income Tax Expense | 0 | 0 | 0 | 0 |
Net Income | (218) | (225) | (751) | (456) |
Comprehensive Income (Loss) | (189) | $ (194) | (713) | (440) |
Net Cash Provided By (Used In) Operating Activities |  |  | (769) | (666) |
Net Cash Provided By (Used In) Investing Activities |  |  | 1,191 | 70 |
Net Cash Provided By (Used In) Financing Activities |  |  | (422) | $ 596 |
Current Assets | (4,374) |  | (4,374) |  | (4,091)
Property, Plant and Equipment, net | 0 |  | 0 |  | 0
Investment in Subsidiaries | (4,904) |  | (4,904) |  | (4,636)
Noncurrent Assets | (176) |  | (176) |  | (195)
Total Assets | (9,454) |  | (9,454) |  | (8,922)
Current Liabilities | (4,374) |  | (4,374) |  | (4,091)
Noncurrent Liabilities | (176) |  | (176) |  | (195)
Long-Term Debt | 0 |  | 0 |  | 0
Member's Equity | (4,904) |  | (4,904) |  | (4,636)
TOTAL LIABILITIES AND CAPITALIZATION | $ (9,454) |  | $ (9,454) |  | $ (8,922)

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