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Guarantees Of Debt (Schedule Of Financial Statements Of Guarantors) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |
Operating Revenues | $ 1,905 | $ 2,314 | $ 4,521 | $ 5,449 |
Operating Expenses | 1,558 | 1,746 | 3,347 | 3,833 |
Operating Income (Loss) | 347 | 568 | 1,174 | 1,616 |
Equity Earnings (Losses) of Subsidiaries | 4 | 4 | 6 | 7 |
Other Income | 44 | 76 | 92 | 124 |
Other Deductions | (10) | (10) | (31) | (22) |
Other-Than-Temporary Impairments | (10) | (10) | (20) | (15) |
Interest Expense | (97) | (97) | (189) | (195) |
Income Tax Expense | (91) | (186) | (374) | (584) |
Net Income | 187 | 345 | 658 | 931 |
Net Cash Provided By (Used In) Operating Activities |  |  | 1,722 | 2,234 |
Net Cash Provided By (Used In) Investing Activities |  |  | (2,004) | (1,773) |
Net Cash Provided By (Used In) Financing Activities |  |  | 536 | (266) |
Current Assets | 3,489 |  | 3,489 |  | $ 3,494
Property, Plant and Equipment, net | 28,014 |  | 28,014 |  | 26,539
Noncurrent Assets | 7,542 |  | 7,542 |  | 7,502
Total Assets | 39,045 |  | 39,045 |  | 37,535
Current Liabilities | 3,120 |  | 3,120 |  | 3,575
Noncurrent Liabilities | 12,333 |  | 12,333 |  | 12,059
Long-Term Debt | 10,273 |  | 10,273 |  | 8,834
Member's Equity | 13,319 |  | 13,319 |  | 13,067
TOTAL LIABILITIES AND CAPITALIZATION | 39,045 |  | 39,045 |  | 37,535
Power Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Operating Revenues | 714 | 1,025 | 2,027 | 2,750 |
Operating Expenses | 726 | 797 | 1,696 | 1,938 |
Operating Income (Loss) | (12) | 228 | 331 | 812 |
Equity Earnings (Losses) of Subsidiaries | 4 | 5 | 6 | 8 |
Other Income | 25 | 55 | 51 | 84 |
Other Deductions | (9) | (7) | (27) | (18) |
Other-Than-Temporary Impairments | (10) | (10) | (20) | (15) |
Interest Expense | (20) | (33) | (42) | (64) |
Income Tax Expense | 11 | (72) | (118) | (306) |
Net Income | (11) | 166 | 181 | 501 |
Comprehensive Income (Loss) | 5 | 159 | 220 | 506 |
Net Cash Provided By (Used In) Operating Activities |  |  | 917 | 1,292 |
Net Cash Provided By (Used In) Investing Activities |  |  | (1,607) | (887) |
Net Cash Provided By (Used In) Financing Activities |  |  | 694 | (402) |
Current Assets | 2,548 |  | 2,548 |  | 1,949
Property, Plant and Equipment, net | 8,478 |  | 8,478 |  | 8,127
Investment in Subsidiaries | 0 |  | 0 |  | 0
Noncurrent Assets | 2,252 |  | 2,252 |  | 2,174
Total Assets | 13,278 |  | 13,278 |  | 12,250
Current Liabilities | 1,263 |  | 1,263 |  | 1,226
Noncurrent Liabilities | 3,413 |  | 3,413 |  | 3,338
Long-Term Debt | 2,380 |  | 2,380 |  | 1,684
Member's Equity | 6,222 |  | 6,222 |  | 6,002
TOTAL LIABILITIES AND CAPITALIZATION | 13,278 |  | 13,278 |  | 12,250
Power Senior Notes [Member] | Consolidating Adjustments [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Operating Revenues | (32) | (26) | (63) | (84) |
Operating Expenses | (32) | (26) | (63) | (84) |
Operating Income (Loss) | 0 | 0 | 0 | 0 |
Equity Earnings (Losses) of Subsidiaries | 0 | (185) | (204) | (533) |
Other Income | (22) | (12) | (45) | (24) |
Other Deductions | 0 | 0 | 0 | 0 |
Other-Than-Temporary Impairments | 0 | 0 | 0 | 0 |
Interest Expense | 22 | 12 | 45 | 24 |
Income Tax Expense | 0 | 0 | 0 | 0 |
Net Income | 0 | (185) | (204) | (533) |
Comprehensive Income (Loss) | (9) | (171) | (229) | (524) |
Net Cash Provided By (Used In) Operating Activities |  |  | (356) | (687) |
Net Cash Provided By (Used In) Investing Activities |  |  | 579 | 766 |
Net Cash Provided By (Used In) Financing Activities |  |  | (223) | (79) |
Current Assets | (4,828) |  | (4,828) |  | (4,828)
Property, Plant and Equipment, net | 0 |  | 0 |  | 0
Investment in Subsidiaries | (4,764) |  | (4,764) |  | (4,847)
Noncurrent Assets | (51) |  | (51) |  | (76)
Total Assets | (9,643) |  | (9,643) |  | (9,751)
Current Liabilities | (4,828) |  | (4,828) |  | (4,828)
Noncurrent Liabilities | (51) |  | (51) |  | (76)
Long-Term Debt | 0 |  | 0 |  | 0
Member's Equity | (4,764) |  | (4,764) |  | (4,847)
TOTAL LIABILITIES AND CAPITALIZATION | (9,643) |  | (9,643) |  | (9,751)
Power Senior Notes [Member] | Power Parent [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Operating Revenues | 0 | 0 | 0 | 0 |
Operating Expenses | 2 | (1) | 12 | 4 |
Operating Income (Loss) | (2) | 1 | (12) | (4) |
Equity Earnings (Losses) of Subsidiaries | (1) | 186 | 204 | 535 |
Other Income | 17 | 12 | 34 | 23 |
Other Deductions | 0 | (1) | 0 | (1) |
Other-Than-Temporary Impairments | 0 | 0 | 0 | 0 |
Interest Expense | (31) | (33) | (61) | (62) |
Income Tax Expense | 6 | 1 | 16 | 10 |
Net Income | (11) | 166 | 181 | 501 |
Comprehensive Income (Loss) | 5 | 159 | 220 | 506 |
Net Cash Provided By (Used In) Operating Activities |  |  | 337 | 410 |
Net Cash Provided By (Used In) Investing Activities |  |  | (1,287) | (480) |
Net Cash Provided By (Used In) Financing Activities |  |  | 951 | 70 |
Current Assets | 5,490 |  | 5,490 |  | 4,501
Property, Plant and Equipment, net | 58 |  | 58 |  | 83
Investment in Subsidiaries | 4,419 |  | 4,419 |  | 4,501
Noncurrent Assets | 134 |  | 134 |  | 155
Total Assets | 10,101 |  | 10,101 |  | 9,240
Current Liabilities | 1,079 |  | 1,079 |  | 1,112
Noncurrent Liabilities | 420 |  | 420 |  | 442
Long-Term Debt | 2,380 |  | 2,380 |  | 1,684
Member's Equity | 6,222 |  | 6,222 |  | 6,002
TOTAL LIABILITIES AND CAPITALIZATION | 10,101 |  | 10,101 |  | 9,240
Power Senior Notes [Member] | Guarantor Subsidiaries [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Operating Revenues | 700 | 1,012 | 2,002 | 2,727 |
Operating Expenses | 716 | 787 | 1,668 | 1,918 |
Operating Income (Loss) | (16) | 225 | 334 | 809 |
Equity Earnings (Losses) of Subsidiaries | 1 | (1) | 0 | (2) |
Other Income | 30 | 55 | 62 | 85 |
Other Deductions | (9) | (6) | (27) | (17) |
Other-Than-Temporary Impairments | (10) | (10) | (20) | (15) |
Interest Expense | (7) | (7) | (17) | (16) |
Income Tax Expense | 3 | (73) | (137) | (315) |
Net Income | (8) | 183 | 195 | 529 |
Comprehensive Income (Loss) | 1 | 169 | 220 | 520 |
Net Cash Provided By (Used In) Operating Activities |  |  | 777 | 1,508 |
Net Cash Provided By (Used In) Investing Activities |  |  | (504) | (963) |
Net Cash Provided By (Used In) Financing Activities |  |  | (273) | (543) |
Current Assets | 1,655 |  | 1,655 |  | 1,912
Property, Plant and Equipment, net | 6,476 |  | 6,476 |  | 6,502
Investment in Subsidiaries | 345 |  | 345 |  | 346
Noncurrent Assets | 2,041 |  | 2,041 |  | 1,959
Total Assets | 10,517 |  | 10,517 |  | 10,719
Current Liabilities | 3,719 |  | 3,719 |  | 3,866
Noncurrent Liabilities | 2,652 |  | 2,652 |  | 2,597
Long-Term Debt | 0 |  | 0 |  | 0
Member's Equity | 4,146 |  | 4,146 |  | 4,256
TOTAL LIABILITIES AND CAPITALIZATION | 10,517 |  | 10,517 |  | 10,719
Power Senior Notes [Member] | Non-Guarantor Subsidiaries [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Operating Revenues | 46 | 39 | 88 | 107 |
Operating Expenses | 40 | 37 | 79 | 100 |
Operating Income (Loss) | 6 | 2 | 9 | 7 |
Equity Earnings (Losses) of Subsidiaries | 4 | 5 | 6 | 8 |
Other Income | 0 | 0 | 0 | 0 |
Other Deductions | 0 | 0 | 0 | 0 |
Other-Than-Temporary Impairments | 0 | 0 | 0 | 0 |
Interest Expense | (4) | (5) | (9) | (10) |
Income Tax Expense | 2 | 0 | 3 | (1) |
Net Income | 8 | 2 | 9 | 4 |
Comprehensive Income (Loss) | 8 | $ 2 | 9 | 4 |
Net Cash Provided By (Used In) Operating Activities |  |  | 159 | 61 |
Net Cash Provided By (Used In) Investing Activities |  |  | (395) | (210) |
Net Cash Provided By (Used In) Financing Activities |  |  | 239 | $ 150 |
Current Assets | 231 |  | 231 |  | 364
Property, Plant and Equipment, net | 1,944 |  | 1,944 |  | 1,542
Investment in Subsidiaries | 0 |  | 0 |  | 0
Noncurrent Assets | 128 |  | 128 |  | 136
Total Assets | 2,303 |  | 2,303 |  | 2,042
Current Liabilities | 1,293 |  | 1,293 |  | 1,076
Noncurrent Liabilities | 392 |  | 392 |  | 375
Long-Term Debt | 0 |  | 0 |  | 0
Member's Equity | 618 |  | 618 |  | 591
TOTAL LIABILITIES AND CAPITALIZATION | $ 2,303 |  | $ 2,303 |  | $ 2,042

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