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Guarantees Of Debt (Schedule Of Financial Statements Of Guarantors) (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |
Operating Revenues | $ 2,818 | $ 2,591 |
Operating Expenses | 1,986 | 2,413 |
Operating Income (Loss) | 832 | 178 |
Equity Earnings (Losses) of Subsidiaries | 2 | 3 |
Net Gains (Losses) on Trust Investments | (22) | 28 |
Other Income (Deductions) | 32 | 32 |
Non-Operating Pension and Other Postretirement Plan Costs | (19) | 0 |
Interest Expense | (103) | (98) |
Income Tax Benefit (Expense) | (202) | (29) |
Net Income (Loss) | 558 | 114 |
Net Cash Provided By (Used In) Operating Activities | 1,140 | 1,197 |
Net Cash Provided By (Used In) Investing Activities | (1,073) | (1,079) |
Net Cash Provided By (Used In) Financing Activities | (248) | (347) |
Current Assets | 2,806 |  | $ 3,312
Property, Plant and Equipment, net | 32,405 |  | 31,797
Noncurrent Assets | 7,579 |  | 7,607
Total Assets | 42,790 |  | 42,716
Current Liabilities | 3,948 |  | 4,168
Noncurrent Liabilities | 12,666 |  | 12,633
Long-Term Debt | 12,072 |  | 12,068
Member's Equity | 14,104 |  | 13,847
TOTAL LIABILITIES AND CAPITALIZATION | 42,790 |  | 42,716
Power [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Operating Revenues | 1,403 | 1,269 |
Operating Expenses | 1,074 | 1,574 |
Operating Income (Loss) | 329 | (305) |
Equity Earnings (Losses) of Subsidiaries | 2 | 3 |
Net Gains (Losses) on Trust Investments | (22) | 19 |
Other Income (Deductions) | 11 | 11 |
Non-Operating Pension and Other Postretirement Plan Costs | (4) | (2) |
Interest Expense | (7) | (16) |
Income Tax Benefit (Expense) | (83) | 116 |
Net Income (Loss) | 234 | (170) |
Net Cash Provided By (Used In) Operating Activities | 542 | 580 |
Net Cash Provided By (Used In) Investing Activities | (317) | (394) |
Net Cash Provided By (Used In) Financing Activities | (246) | (179) |
Current Assets | 1,118 |  | 1,341
Property, Plant and Equipment, net | 8,689 |  | 8,596
Noncurrent Assets | 2,456 |  | 2,481
Total Assets | 12,263 |  | 12,418
Current Liabilities | 1,025 |  | 1,435
Noncurrent Liabilities | 2,905 |  | 2,880
Long-Term Debt | 2,137 |  | 2,136
Member's Equity | 6,196 |  | 5,967
TOTAL LIABILITIES AND CAPITALIZATION | 12,263 |  | 12,418
Power Senior Notes [Member] | Consolidating Adjustments [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Operating Revenues | (34) | (38) |
Operating Expenses | (34) | (38) |
Operating Income (Loss) | 0 | 0 |
Equity Earnings (Losses) of Subsidiaries | (231) | 162 |
Net Gains (Losses) on Trust Investments | 0 | 0 |
Other Income (Deductions) | (57) | (28) |
Non-Operating Pension and Other Postretirement Plan Costs | 0 | 0 |
Interest Expense | 57 | 28 |
Income Tax Benefit (Expense) | 0 | 0 |
Net Income (Loss) | (231) | 162 |
Comprehensive Income (Loss) | (221) | 141 |
Net Cash Provided By (Used In) Operating Activities | 71 | 35 |
Net Cash Provided By (Used In) Investing Activities | 605 | (511) |
Net Cash Provided By (Used In) Financing Activities | (677) | 476 |
Current Assets | (4,631) |  | (4,686)
Property, Plant and Equipment, net | 0 |  | 0
Investment in Subsidiaries | (6,204) |  | (5,248)
Noncurrent Assets | (38) |  | (78)
Total Assets | (10,873) |  | (10,012)
Current Liabilities | (4,631) |  | (4,686)
Noncurrent Liabilities | (38) |  | (78)
Long-Term Debt | 0 |  | 0
Member's Equity | (6,204) |  | (5,248)
TOTAL LIABILITIES AND CAPITALIZATION | (10,873) |  | (10,012)
Power Senior Notes [Member] | Guarantor Subsidiaries [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Operating Revenues | 1,386 | 1,255 |
Operating Expenses | 1,056 | 1,556 |
Operating Income (Loss) | 330 | (301) |
Equity Earnings (Losses) of Subsidiaries | (3) | (1) |
Net Gains (Losses) on Trust Investments | (22) | 15 |
Other Income (Deductions) | 33 | 19 |
Non-Operating Pension and Other Postretirement Plan Costs | (4) | (2) |
Interest Expense | (17) | (9) |
Income Tax Benefit (Expense) | (92) | 111 |
Net Income (Loss) | 233 | (164) |
Comprehensive Income (Loss) | 223 | (143) |
Net Cash Provided By (Used In) Operating Activities | 525 | 377 |
Net Cash Provided By (Used In) Investing Activities | (625) | 20 |
Net Cash Provided By (Used In) Financing Activities | 100 | (395) |
Current Assets | 1,392 |  | 1,500
Property, Plant and Equipment, net | 5,094 |  | 5,778
Investment in Subsidiaries | 1,115 |  | 404
Noncurrent Assets | 2,295 |  | 2,349
Total Assets | 9,896 |  | 10,031
Current Liabilities | 3,234 |  | 3,586
Noncurrent Liabilities | 1,961 |  | 1,966
Long-Term Debt | 0 |  | 0
Member's Equity | 4,701 |  | 4,479
TOTAL LIABILITIES AND CAPITALIZATION | 9,896 |  | 10,031
Power Senior Notes [Member] | Non-Guarantor Subsidiaries [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Operating Revenues | 51 | 52 |
Operating Expenses | 52 | 52 |
Operating Income (Loss) | (1) | 0 |
Equity Earnings (Losses) of Subsidiaries | 2 | 3 |
Net Gains (Losses) on Trust Investments | 0 | 0 |
Other Income (Deductions) | 0 | 0 |
Non-Operating Pension and Other Postretirement Plan Costs | 0 | 0 |
Interest Expense | (5) | (5) |
Income Tax Benefit (Expense) | 2 | 4 |
Net Income (Loss) | (2) | 2 |
Comprehensive Income (Loss) | (2) | 2 |
Net Cash Provided By (Used In) Operating Activities | (49) | 91 |
Net Cash Provided By (Used In) Investing Activities | (82) | (154) |
Net Cash Provided By (Used In) Financing Activities | 111 | 68 |
Current Assets | 189 |  | 200
Property, Plant and Equipment, net | 3,540 |  | 2,764
Investment in Subsidiaries | 0 |  | 0
Noncurrent Assets | 109 |  | 110
Total Assets | 3,838 |  | 3,074
Current Liabilities | 1,874 |  | 1,846
Noncurrent Liabilities | 461 |  | 459
Long-Term Debt | 0 |  | 0
Member's Equity | 1,503 |  | 769
TOTAL LIABILITIES AND CAPITALIZATION | 3,838 |  | 3,074
Power Senior Notes [Member] | Power Parent [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Operating Revenues | 0 | 0 |
Operating Expenses | 0 | 4 |
Operating Income (Loss) | 0 | (4) |
Equity Earnings (Losses) of Subsidiaries | 234 | (161) |
Net Gains (Losses) on Trust Investments | 0 | 4 |
Other Income (Deductions) | 35 | 20 |
Non-Operating Pension and Other Postretirement Plan Costs | 0 | 0 |
Interest Expense | (42) | (30) |
Income Tax Benefit (Expense) | 7 | 1 |
Net Income (Loss) | 234 | (170) |
Comprehensive Income (Loss) | 229 | (146) |
Net Cash Provided By (Used In) Operating Activities | (5) | 77 |
Net Cash Provided By (Used In) Investing Activities | (215) | 251 |
Net Cash Provided By (Used In) Financing Activities | 220 | (328) |
Current Assets | 4,168 |  | 4,327
Property, Plant and Equipment, net | 55 |  | 54
Investment in Subsidiaries | 5,089 |  | 4,844
Noncurrent Assets | 90 |  | 100
Total Assets | 9,402 |  | 9,325
Current Liabilities | 548 |  | 689
Noncurrent Liabilities | 521 |  | 533
Long-Term Debt | 2,137 |  | 2,136
Member's Equity | 6,196 |  | 5,967
TOTAL LIABILITIES AND CAPITALIZATION | 9,402 |  | 9,325
Power Senior Notes [Member] | Power [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Operating Revenues | 1,403 | 1,269 |
Operating Expenses | 1,074 | 1,574 |
Operating Income (Loss) | 329 | (305) |
Equity Earnings (Losses) of Subsidiaries | 2 | 3 |
Net Gains (Losses) on Trust Investments | (22) | 19 |
Other Income (Deductions) | 11 | 11 |
Non-Operating Pension and Other Postretirement Plan Costs | (4) | (2) |
Interest Expense | (7) | (16) |
Income Tax Benefit (Expense) | (83) | 116 |
Net Income (Loss) | 234 | (170) |
Comprehensive Income (Loss) | 229 | (146) |
Net Cash Provided By (Used In) Operating Activities | 542 | 580 |
Net Cash Provided By (Used In) Investing Activities | (317) | (394) |
Net Cash Provided By (Used In) Financing Activities | (246) | $ (179) |
Current Assets | 1,118 |  | 1,341
Property, Plant and Equipment, net | 8,689 |  | 8,596
Investment in Subsidiaries | 0 |  | 0
Noncurrent Assets | 2,456 |  | 2,481
Total Assets | 12,263 |  | 12,418
Current Liabilities | 1,025 |  | 1,435
Noncurrent Liabilities | 2,905 |  | 2,880
Long-Term Debt | 2,137 |  | 2,136
Member's Equity | 6,196 |  | 5,967
TOTAL LIABILITIES AND CAPITALIZATION | $ 12,263 |  | $ 12,418

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