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Guarantees Of Debt (Schedule Of Financial Statements Of Guarantors) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Guarantees of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | $ 2,090 | $ 2,450 | $ 1,905 | $ 2,616 | $ 2,278 | $ 2,688 | $ 2,314 | $ 3,135 | $ 9,061 | $ 10,415 | $ 10,886 |
Operating Expenses |  |  |  |  |  |  |  |  | 7,485 | 7,453 | 8,263 |
Operating Income (Loss) | (175) | 577 | 347 | 827 | 532 | 814 | 568 | 1,048 | 1,576 | 2,962 | 2,623 |
Equity Earnings (Losses) of Subsidiaries |  |  |  |  |  |  |  |  | 11 | 12 | 13 |
Other Income |  |  |  |  |  |  |  |  | 191 | 254 | 290 |
Other Deductions |  |  |  |  |  |  |  |  | (67) | (102) | (61) |
Other-than-Temporary-Impairments |  |  |  |  |  |  |  |  | (28) | (53) | (20) |
Interest Expense |  |  |  |  |  |  |  |  | (385) | (393) | (389) |
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | (411) | (1,001) | (938) |
Net Income |  |  |  |  |  |  |  |  | 887 | 1,679 | 1,518 |
Net Cash Provided By (Used In) Operating Activities |  |  |  |  |  |  |  |  | 3,311 | 3,919 | 3,160 |
Net Cash Provided By (Used In) Investing Activities |  |  |  |  |  |  |  |  | (4,248) | (3,942) | (2,892) |
Net Cash Provided By (Used In) Financing Activities |  |  |  |  |  |  |  |  | 966 | 15 | (359) |
Current Assets | 3,254 |  |  |  | 3,494 |  |  |  | 3,254 | 3,494 |  |
Property, Plant and Equipment, net | 29,286 |  |  |  | 26,539 |  |  |  | 29,286 | 26,539 |  |
Noncurrent Assets | 7,530 |  |  |  | 7,502 |  |  |  | 7,530 | 7,502 |  |
Total Assets | 40,070 |  |  |  | 37,535 |  |  |  | 40,070 | 37,535 | 35,287 |
Current Liabilities | 3,276 |  |  |  | 3,575 |  |  |  | 3,276 | 3,575 |  |
Noncurrent Liabilities | 12,769 |  |  |  | 12,059 |  |  |  | 12,769 | 12,059 |  |
Total Long-Term Debt | 10,895 |  |  |  | 8,834 |  |  |  | 10,895 | 8,834 |  |
Member's Equity | 13,130 |  |  |  | 13,067 |  |  |  | 13,130 | 13,067 | 12,186 | $ 11,609
TOTAL LIABILITIES AND CAPITALIZATION | 40,070 |  |  |  | 37,535 |  |  |  | 40,070 | 37,535 |  |
Power [Member] |  |  |  |  |  |  |  |  |  |  |  |
Guarantees of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | 921 | 1,075 | 714 | 1,313 | 1,082 | 1,096 | 1,025 | 1,725 | 4,023 | 4,928 | 5,434 |
Operating Expenses |  |  |  |  |  |  |  |  | 4,010 | 3,498 | 4,225 |
Operating Income (Loss) | (556) | $ 238 | $ (12) | $ 343 | 227 | $ 391 | $ 228 | $ 584 | 13 | 1,430 | 1,209 |
Equity Earnings (Losses) of Subsidiaries |  |  |  |  |  |  |  |  | 11 | 14 | 14 |
Other Income |  |  |  |  |  |  |  |  | 102 | 169 | 222 |
Other Deductions |  |  |  |  |  |  |  |  | (57) | (72) | (52) |
Other-than-Temporary-Impairments |  |  |  |  |  |  |  |  | (28) | (53) | (20) |
Interest Expense |  |  |  |  |  |  |  |  | (84) | (121) | (122) |
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | 61 | (511) | (491) |
Net Income |  |  |  |  |  |  |  |  | 18 | 856 | 760 |
Net Cash Provided By (Used In) Operating Activities |  |  |  |  |  |  |  |  | 1,255 | 1,706 | 1,425 |
Net Cash Provided By (Used In) Investing Activities |  |  |  |  |  |  |  |  | (1,147) | (1,001) | (524) |
Net Cash Provided By (Used In) Financing Activities |  |  |  |  |  |  |  |  | (109) | (702) | (898) |
Current Assets | 1,460 |  |  |  | 1,949 |  |  |  | 1,460 | 1,949 |  |
Property, Plant and Equipment, net | 8,520 |  |  |  | 8,127 |  |  |  | 8,520 | 8,127 |  |
Noncurrent Assets | 2,213 |  |  |  | 2,174 |  |  |  | 2,213 | 2,174 |  |
Total Assets | 12,193 |  |  |  | 12,250 |  |  |  | 12,193 | 12,250 |  |
Current Liabilities | 680 |  |  |  | 1,226 |  |  |  | 680 | 1,226 |  |
Noncurrent Liabilities | 3,332 |  |  |  | 3,338 |  |  |  | 3,332 | 3,338 |  |
Total Long-Term Debt | 2,382 |  |  |  | 1,684 |  |  |  | 2,382 | 1,684 |  |
Member's Equity | 5,799 |  |  |  | 6,002 |  |  |  | 5,799 | 6,002 | 5,558 | $ 5,858
TOTAL LIABILITIES AND CAPITALIZATION | 12,193 |  |  |  | 12,250 |  |  |  | 12,193 | 12,250 |  |
Power Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Guarantees of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 4,023 | 4,928 | 5,434 |
Operating Expenses |  |  |  |  |  |  |  |  | 4,010 | 3,498 | 4,225 |
Operating Income (Loss) |  |  |  |  |  |  |  |  | 13 | 1,430 | 1,209 |
Equity Earnings (Losses) of Subsidiaries |  |  |  |  |  |  |  |  | 11 | 14 | 14 |
Other Income |  |  |  |  |  |  |  |  | 102 | 169 | 222 |
Other Deductions |  |  |  |  |  |  |  |  | (57) | (72) | (52) |
Other-than-Temporary-Impairments |  |  |  |  |  |  |  |  | (28) | (53) | (20) |
Interest Expense |  |  |  |  |  |  |  |  | (84) | (121) | (122) |
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | 61 | (511) | (491) |
Net Income |  |  |  |  |  |  |  |  | 18 | 856 | 760 |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent |  |  |  |  |  |  |  |  | 47 | 844 | 595 |
Net Cash Provided By (Used In) Operating Activities |  |  |  |  |  |  |  |  | 1,255 | 1,706 | 1,425 |
Net Cash Provided By (Used In) Investing Activities |  |  |  |  |  |  |  |  | (1,147) | (1,001) | (524) |
Net Cash Provided By (Used In) Financing Activities |  |  |  |  |  |  |  |  | (109) | (702) | (898) |
Current Assets | 1,460 |  |  |  | 1,949 |  |  |  | 1,460 | 1,949 |  |
Property, Plant and Equipment, net | 8,520 |  |  |  | 8,127 |  |  |  | 8,520 | 8,127 |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | 0 |  |  |  | 0 |  |  |  | 0 | 0 |  |
Noncurrent Assets | 2,213 |  |  |  | 2,174 |  |  |  | 2,213 | 2,174 |  |
Total Assets | 12,193 |  |  |  | 12,250 |  |  |  | 12,193 | 12,250 |  |
Current Liabilities | 680 |  |  |  | 1,226 |  |  |  | 680 | 1,226 |  |
Noncurrent Liabilities | 3,332 |  |  |  | 3,338 |  |  |  | 3,332 | 3,338 |  |
Total Long-Term Debt | 2,382 |  |  |  | 1,684 |  |  |  | 2,382 | 1,684 |  |
Member's Equity | 5,799 |  |  |  | 6,002 |  |  |  | 5,799 | 6,002 |  |
TOTAL LIABILITIES AND CAPITALIZATION | 12,193 |  |  |  | 12,250 |  |  |  | 12,193 | 12,250 |  |
Power Senior Notes [Member] | Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |
Guarantees of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 3,971 | 4,883 | 5,390 |
Operating Expenses |  |  |  |  |  |  |  |  | 3,962 | 3,451 | 4,175 |
Operating Income (Loss) |  |  |  |  |  |  |  |  | 9 | 1,432 | 1,215 |
Equity Earnings (Losses) of Subsidiaries |  |  |  |  |  |  |  |  | (3) | (4) | (5) |
Other Income |  |  |  |  |  |  |  |  | 120 | 174 | 222 |
Other Deductions |  |  |  |  |  |  |  |  | (39) | (45) | (32) |
Other-than-Temporary-Impairments |  |  |  |  |  |  |  |  | (28) | (53) | (20) |
Interest Expense |  |  |  |  |  |  |  |  | (40) | (39) | (35) |
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | (11) | (574) | (558) |
Net Income |  |  |  |  |  |  |  |  | 8 | 891 | 787 |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent |  |  |  |  |  |  |  |  | 50 | 855 | 768 |
Net Cash Provided By (Used In) Operating Activities |  |  |  |  |  |  |  |  | 1,442 | 2,089 | 1,674 |
Net Cash Provided By (Used In) Investing Activities |  |  |  |  |  |  |  |  | (707) | (1,519) | (856) |
Net Cash Provided By (Used In) Financing Activities |  |  |  |  |  |  |  |  | (736) | (571) | (818) |
Current Assets | 1,593 |  |  |  | 1,912 |  |  |  | 1,593 | 1,912 |  |
Property, Plant and Equipment, net | 6,145 |  |  |  | 6,502 |  |  |  | 6,145 | 6,502 |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | 344 |  |  |  | 346 |  |  |  | 344 | 346 |  |
Noncurrent Assets | 2,016 |  |  |  | 1,959 |  |  |  | 2,016 | 1,959 |  |
Total Assets | 10,098 |  |  |  | 10,719 |  |  |  | 10,098 | 10,719 |  |
Current Liabilities | 3,752 |  |  |  | 3,866 |  |  |  | 3,752 | 3,866 |  |
Noncurrent Liabilities | 2,398 |  |  |  | 2,597 |  |  |  | 2,398 | 2,597 |  |
Total Long-Term Debt | 0 |  |  |  | 0 |  |  |  | 0 | 0 |  |
Member's Equity | 3,948 |  |  |  | 4,256 |  |  |  | 3,948 | 4,256 |  |
TOTAL LIABILITIES AND CAPITALIZATION | 10,098 |  |  |  | 10,719 |  |  |  | 10,098 | 10,719 |  |
Power Senior Notes [Member] | Non-Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |
Guarantees of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 173 | 179 | 153 |
Operating Expenses |  |  |  |  |  |  |  |  | 161 | 169 | 143 |
Operating Income (Loss) |  |  |  |  |  |  |  |  | 12 | 10 | 10 |
Equity Earnings (Losses) of Subsidiaries |  |  |  |  |  |  |  |  | 11 | 14 | 14 |
Other Income |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Other Deductions |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Other-than-Temporary-Impairments |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Interest Expense |  |  |  |  |  |  |  |  | (18) | (19) | (19) |
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | 20 | 6 | 2 |
Net Income |  |  |  |  |  |  |  |  | 25 | 11 | 7 |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent |  |  |  |  |  |  |  |  | 25 | 11 | 7 |
Net Cash Provided By (Used In) Operating Activities |  |  |  |  |  |  |  |  | 323 | 80 | 76 |
Net Cash Provided By (Used In) Investing Activities |  |  |  |  |  |  |  |  | (789) | (430) | (42) |
Net Cash Provided By (Used In) Financing Activities |  |  |  |  |  |  |  |  | 466 | 354 | (32) |
Current Assets | 152 |  |  |  | 364 |  |  |  | 152 | 364 |  |
Property, Plant and Equipment, net | 2,320 |  |  |  | 1,542 |  |  |  | 2,320 | 1,542 |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | 0 |  |  |  | 0 |  |  |  | 0 | 0 |  |
Noncurrent Assets | 129 |  |  |  | 136 |  |  |  | 129 | 136 |  |
Total Assets | 2,601 |  |  |  | 2,042 |  |  |  | 2,601 | 2,042 |  |
Current Liabilities | 1,454 |  |  |  | 1,076 |  |  |  | 1,454 | 1,076 |  |
Noncurrent Liabilities | 502 |  |  |  | 375 |  |  |  | 502 | 375 |  |
Total Long-Term Debt | 0 |  |  |  | 0 |  |  |  | 0 | 0 |  |
Member's Equity | 645 |  |  |  | 591 |  |  |  | 645 | 591 |  |
TOTAL LIABILITIES AND CAPITALIZATION | 2,601 |  |  |  | 2,042 |  |  |  | 2,601 | 2,042 |  |
Power Senior Notes [Member] | Power Parent [Member] |  |  |  |  |  |  |  |  |  |  |  |
Guarantees of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Operating Expenses |  |  |  |  |  |  |  |  | 8 | 12 | 16 |
Operating Income (Loss) |  |  |  |  |  |  |  |  | (8) | (12) | (16) |
Equity Earnings (Losses) of Subsidiaries |  |  |  |  |  |  |  |  | 36 | 906 | 799 |
Other Income |  |  |  |  |  |  |  |  | 71 | 48 | 34 |
Other Deductions |  |  |  |  |  |  |  |  | (18) | (27) | (20) |
Other-than-Temporary-Impairments |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Interest Expense |  |  |  |  |  |  |  |  | (115) | (116) | (102) |
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | 52 | 57 | 65 |
Net Income |  |  |  |  |  |  |  |  | 18 | 856 | 760 |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent |  |  |  |  |  |  |  |  | 47 | 844 | 595 |
Net Cash Provided By (Used In) Operating Activities |  |  |  |  |  |  |  |  | 97 | 571 | 577 |
Net Cash Provided By (Used In) Investing Activities |  |  |  |  |  |  |  |  | 60 | (366) | 148 |
Net Cash Provided By (Used In) Financing Activities |  |  |  |  |  |  |  |  | (157) | (205) | (724) |
Current Assets | 4,412 |  |  |  | 4,501 |  |  |  | 4,412 | 4,501 |  |
Property, Plant and Equipment, net | 55 |  |  |  | 83 |  |  |  | 55 | 83 |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | 4,249 |  |  |  | 4,501 |  |  |  | 4,249 | 4,501 |  |
Noncurrent Assets | 168 |  |  |  | 155 |  |  |  | 168 | 155 |  |
Total Assets | 8,884 |  |  |  | 9,240 |  |  |  | 8,884 | 9,240 |  |
Current Liabilities | 171 |  |  |  | 1,112 |  |  |  | 171 | 1,112 |  |
Noncurrent Liabilities | 532 |  |  |  | 442 |  |  |  | 532 | 442 |  |
Total Long-Term Debt | 2,382 |  |  |  | 1,684 |  |  |  | 2,382 | 1,684 |  |
Member's Equity | 5,799 |  |  |  | 6,002 |  |  |  | 5,799 | 6,002 |  |
TOTAL LIABILITIES AND CAPITALIZATION | 8,884 |  |  |  | 9,240 |  |  |  | 8,884 | 9,240 |  |
Consolidation, Eliminations [Member] | Power Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Guarantees of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | (121) | (134) | (109) |
Operating Expenses |  |  |  |  |  |  |  |  | (121) | (134) | (109) |
Operating Income (Loss) |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Equity Earnings (Losses) of Subsidiaries |  |  |  |  |  |  |  |  | (33) | (902) | (794) |
Other Income |  |  |  |  |  |  |  |  | (89) | (53) | (34) |
Other Deductions |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Other-than-Temporary-Impairments |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Interest Expense |  |  |  |  |  |  |  |  | 89 | 53 | 34 |
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Net Income |  |  |  |  |  |  |  |  | (33) | (902) | (794) |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent |  |  |  |  |  |  |  |  | (75) | (866) | (775) |
Net Cash Provided By (Used In) Operating Activities |  |  |  |  |  |  |  |  | (607) | (1,034) | (902) |
Net Cash Provided By (Used In) Investing Activities |  |  |  |  |  |  |  |  | 289 | 1,314 | 226 |
Net Cash Provided By (Used In) Financing Activities |  |  |  |  |  |  |  |  | 318 | (280) | $ 676 |
Current Assets | (4,697) |  |  |  | (4,828) |  |  |  | (4,697) | (4,828) |  |
Property, Plant and Equipment, net | 0 |  |  |  | 0 |  |  |  | 0 | 0 |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | (4,593) |  |  |  | (4,847) |  |  |  | (4,593) | (4,847) |  |
Noncurrent Assets | (100) |  |  |  | (76) |  |  |  | (100) | (76) |  |
Total Assets | (9,390) |  |  |  | (9,751) |  |  |  | (9,390) | (9,751) |  |
Current Liabilities | (4,697) |  |  |  | (4,828) |  |  |  | (4,697) | (4,828) |  |
Noncurrent Liabilities | (100) |  |  |  | (76) |  |  |  | (100) | (76) |  |
Total Long-Term Debt | 0 |  |  |  | 0 |  |  |  | 0 | 0 |  |
Member's Equity | (4,593) |  |  |  | (4,847) |  |  |  | (4,593) | (4,847) |  |
TOTAL LIABILITIES AND CAPITALIZATION | $ (9,390) |  |  |  | $ (9,751) |  |  |  | $ (9,390) | $ (9,751) |  |

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