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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |
Operating Revenues | $ 2,394 | $ 2,254 | $ 7,228 | $ 6,987 |
Operating Expenses | 1,840 | 1,561 | 5,431 | 5,921 |
Operating Income (Loss) | 554 | 693 | 1,797 | 1,066 |
Equity Earnings (Losses) of Subsidiaries | 5 | 3 | 12 | 11 |
Net Gains (Losses) on Trust Investments | 45 | 18 | 31 | 71 |
Other Income (Deductions) | 33 | 33 | 99 | 98 |
Non-Operating Pension and OPEB Credits (Costs) | 19 | 0 | 57 | 1 |
Interest Expense | (127) | (100) | (341) | (289) |
Income Tax Benefit (Expense) | (117) | (252) | (416) | (340) |
Net Income (Loss) | 412 | 395 | 1,239 | 618 |
Net Cash Provided By (Used In) Operating Activities |  |  | 2,492 | 2,733 |
Net Cash Provided By (Used In) Investing Activities |  |  | (3,113) | (3,104) |
Net Cash Provided By (Used In) Financing Activities |  |  | 412 | 225 |
Current Assets | 3,215 |  | 3,215 |  | $ 3,312
Property, Plant and Equipment, net | 33,781 |  | 33,781 |  | 31,797
Noncurrent Assets | 8,077 |  | 8,077 |  | 7,607
Total Assets | 45,073 |  | 45,073 |  | 42,716
Current Liabilities | 4,485 |  | 4,485 |  | 4,168
Noncurrent Liabilities | 13,320 |  | 13,320 |  | 12,633
Long-Term Debt | 12,909 |  | 12,909 |  | 12,068
Member's Equity | 14,359 |  | 14,359 |  | 13,847
TOTAL LIABILITIES AND CAPITALIZATION | 45,073 |  | 45,073 |  | 42,716
Power [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Operating Revenues | 868 | 846 | 3,038 | 3,033 |
Operating Expenses | 756 | 635 | 2,555 | 3,316 |
Operating Income (Loss) | 112 | 211 | 483 | (283) |
Equity Earnings (Losses) of Subsidiaries | 5 | 3 | 12 | 11 |
Net Gains (Losses) on Trust Investments | 44 | 19 | 30 | 62 |
Other Income (Deductions) | 14 | 11 | 38 | 34 |
Non-Operating Pension and OPEB Credits (Costs) | 4 | 2 | 11 | 6 |
Interest Expense | (29) | (12) | (47) | (41) |
Income Tax Benefit (Expense) | (25) | (98) | (127) | 80 |
Net Income (Loss) | 125 | 136 | 400 | (131) |
Net Cash Provided By (Used In) Operating Activities |  |  | 1,005 | 1,249 |
Net Cash Provided By (Used In) Investing Activities |  |  | (1,010) | (884) |
Net Cash Provided By (Used In) Financing Activities |  |  | 14 | (354) |
Current Assets | 1,376 |  | 1,376 |  | 1,341
Property, Plant and Equipment, net | 8,869 |  | 8,869 |  | 8,596
Noncurrent Assets | 2,436 |  | 2,436 |  | 2,481
Total Assets | 12,681 |  | 12,681 |  | 12,418
Current Liabilities | 869 |  | 869 |  | 1,435
Noncurrent Liabilities | 3,011 |  | 3,011 |  | 2,880
Long-Term Debt | 2,834 |  | 2,834 |  | 2,136
Member's Equity | 5,967 |  | 5,967 |  | 5,967
TOTAL LIABILITIES AND CAPITALIZATION | 12,681 |  | 12,681 |  | 12,418
Power Senior Notes [Member] | Consolidating Adjustments [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Operating Revenues | (40) | (29) | (105) | (95) |
Operating Expenses | (40) | (29) | (105) | (95) |
Operating Income (Loss) | 0 | 0 | 0 | 0 |
Equity Earnings (Losses) of Subsidiaries | (110) | (140) | (392) | 119 |
Net Gains (Losses) on Trust Investments | 0 | 0 | 0 | 0 |
Other Income (Deductions) | (71) | (37) | (196) | (99) |
Non-Operating Pension and OPEB Credits (Costs) | 0 | 0 | 0 | 0 |
Interest Expense | 71 | 37 | 196 | 99 |
Income Tax Benefit (Expense) | 0 | 0 | 0 | 0 |
Net Income (Loss) | (110) | (140) | (392) | 119 |
Comprehensive Income (Loss) | (106) | (154) | (375) | 75 |
Net Cash Provided By (Used In) Operating Activities |  |  | 117 | 3 |
Net Cash Provided By (Used In) Investing Activities |  |  | 829 | (990) |
Net Cash Provided By (Used In) Financing Activities |  |  | (946) | 987 |
Current Assets | (4,776) |  | (4,776) |  | (4,686)
Property, Plant and Equipment, net | 0 |  | 0 |  | 0
Investment in Subsidiaries | (6,210) |  | (6,210) |  | (5,248)
Noncurrent Assets | (217) |  | (217) |  | (78)
Total Assets | (11,203) |  | (11,203) |  | (10,012)
Current Liabilities | (4,776) |  | (4,776) |  | (4,686)
Noncurrent Liabilities | (217) |  | (217) |  | (78)
Long-Term Debt | 0 |  | 0 |  | 0
Member's Equity | (6,210) |  | (6,210) |  | (5,248)
TOTAL LIABILITIES AND CAPITALIZATION | (11,203) |  | (11,203) |  | (10,012)
Power Senior Notes [Member] | Guarantor Subsidiaries [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Operating Revenues | 849 | 829 | 2,982 | 2,983 |
Operating Expenses | 733 | 618 | 2,493 | 3,268 |
Operating Income (Loss) | 116 | 211 | 489 | (285) |
Equity Earnings (Losses) of Subsidiaries | (7) | (3) | (14) | (8) |
Net Gains (Losses) on Trust Investments | 45 | 19 | 31 | 59 |
Other Income (Deductions) | 45 | 26 | 118 | 66 |
Non-Operating Pension and OPEB Credits (Costs) | 4 | 2 | 10 | 6 |
Interest Expense | (28) | (12) | (64) | (30) |
Income Tax Benefit (Expense) | (64) | (103) | (179) | 68 |
Net Income (Loss) | 111 | 140 | 391 | (124) |
Comprehensive Income (Loss) | 107 | 154 | 374 | (80) |
Net Cash Provided By (Used In) Operating Activities |  |  | 1,169 | 1,159 |
Net Cash Provided By (Used In) Investing Activities |  |  | (1,132) | (289) |
Net Cash Provided By (Used In) Financing Activities |  |  | (32) | (869) |
Current Assets | 1,353 |  | 1,353 |  | 1,500
Property, Plant and Equipment, net | 5,074 |  | 5,074 |  | 5,778
Investment in Subsidiaries | 1,124 |  | 1,124 |  | 404
Noncurrent Assets | 2,302 |  | 2,302 |  | 2,349
Total Assets | 9,853 |  | 9,853 |  | 10,031
Current Liabilities | 3,030 |  | 3,030 |  | 3,586
Noncurrent Liabilities | 2,129 |  | 2,129 |  | 1,966
Long-Term Debt | 0 |  | 0 |  | 0
Member's Equity | 4,694 |  | 4,694 |  | 4,479
TOTAL LIABILITIES AND CAPITALIZATION | 9,853 |  | 9,853 |  | 10,031
Power Senior Notes [Member] | Non-Guarantor Subsidiaries [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Operating Revenues | 59 | 46 | 161 | 145 |
Operating Expenses | 61 | 44 | 162 | 139 |
Operating Income (Loss) | (2) | 2 | (1) | 6 |
Equity Earnings (Losses) of Subsidiaries | 5 | 3 | 12 | 11 |
Net Gains (Losses) on Trust Investments | (1) | 0 | (1) | 0 |
Other Income (Deductions) | 0 | (2) | 0 | 0 |
Non-Operating Pension and OPEB Credits (Costs) | 0 | 0 | 1 | 0 |
Interest Expense | (7) | (5) | (18) | (14) |
Income Tax Benefit (Expense) | 4 | 2 | 8 | 2 |
Net Income (Loss) | (1) | 0 | 1 | 5 |
Comprehensive Income (Loss) | (1) | 0 | 1 | 5 |
Net Cash Provided By (Used In) Operating Activities |  |  | (26) | 142 |
Net Cash Provided By (Used In) Investing Activities |  |  | (290) | (343) |
Net Cash Provided By (Used In) Financing Activities |  |  | 320 | 211 |
Current Assets | 302 |  | 302 |  | 200
Property, Plant and Equipment, net | 3,740 |  | 3,740 |  | 2,764
Investment in Subsidiaries | 0 |  | 0 |  | 0
Noncurrent Assets | 106 |  | 106 |  | 110
Total Assets | 4,148 |  | 4,148 |  | 3,074
Current Liabilities | 1,999 |  | 1,999 |  | 1,846
Noncurrent Liabilities | 633 |  | 633 |  | 459
Long-Term Debt | 0 |  | 0 |  | 0
Member's Equity | 1,516 |  | 1,516 |  | 769
TOTAL LIABILITIES AND CAPITALIZATION | 4,148 |  | 4,148 |  | 3,074
Power Senior Notes [Member] | Power Parent [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Operating Revenues | 0 | 0 | 0 | 0 |
Operating Expenses | 2 | 2 | 5 | 4 |
Operating Income (Loss) | (2) | (2) | (5) | (4) |
Equity Earnings (Losses) of Subsidiaries | 117 | 143 | 406 | (111) |
Net Gains (Losses) on Trust Investments | 0 | 0 | 0 | 3 |
Other Income (Deductions) | 40 | 24 | 116 | 67 |
Non-Operating Pension and OPEB Credits (Costs) | 0 | 0 | 0 | 0 |
Interest Expense | (65) | (32) | (161) | (96) |
Income Tax Benefit (Expense) | 35 | 3 | 44 | 10 |
Net Income (Loss) | 125 | 136 | 400 | (131) |
Comprehensive Income (Loss) | 128 | 156 | 400 | (72) |
Net Cash Provided By (Used In) Operating Activities |  |  | (255) | (55) |
Net Cash Provided By (Used In) Investing Activities |  |  | (417) | 738 |
Net Cash Provided By (Used In) Financing Activities |  |  | 672 | (683) |
Current Assets | 4,497 |  | 4,497 |  | 4,327
Property, Plant and Equipment, net | 55 |  | 55 |  | 54
Investment in Subsidiaries | 5,086 |  | 5,086 |  | 4,844
Noncurrent Assets | 245 |  | 245 |  | 100
Total Assets | 9,883 |  | 9,883 |  | 9,325
Current Liabilities | 616 |  | 616 |  | 689
Noncurrent Liabilities | 466 |  | 466 |  | 533
Long-Term Debt | 2,834 |  | 2,834 |  | 2,136
Member's Equity | 5,967 |  | 5,967 |  | 5,967
TOTAL LIABILITIES AND CAPITALIZATION | 9,883 |  | 9,883 |  | 9,325
Power Senior Notes [Member] | Power [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Operating Revenues | 868 | 846 | 3,038 | 3,033 |
Operating Expenses | 756 | 635 | 2,555 | 3,316 |
Operating Income (Loss) | 112 | 211 | 483 | (283) |
Equity Earnings (Losses) of Subsidiaries | 5 | 3 | 12 | 11 |
Net Gains (Losses) on Trust Investments | 44 | 19 | 30 | 62 |
Other Income (Deductions) | 14 | 11 | 38 | 34 |
Non-Operating Pension and OPEB Credits (Costs) | 4 | 2 | 11 | 6 |
Interest Expense | (29) | (12) | (47) | (41) |
Income Tax Benefit (Expense) | (25) | (98) | (127) | 80 |
Net Income (Loss) | 125 | 136 | 400 | (131) |
Comprehensive Income (Loss) | 128 | $ 156 | 400 | (72) |
Net Cash Provided By (Used In) Operating Activities |  |  | 1,005 | 1,249 |
Net Cash Provided By (Used In) Investing Activities |  |  | (1,010) | (884) |
Net Cash Provided By (Used In) Financing Activities |  |  | 14 | $ (354) |
Current Assets | 1,376 |  | 1,376 |  | 1,341
Property, Plant and Equipment, net | 8,869 |  | 8,869 |  | 8,596
Investment in Subsidiaries | 0 |  | 0 |  | 0
Noncurrent Assets | 2,436 |  | 2,436 |  | 2,481
Total Assets | 12,681 |  | 12,681 |  | 12,418
Current Liabilities | 869 |  | 869 |  | 1,435
Noncurrent Liabilities | 3,011 |  | 3,011 |  | 2,880
Long-Term Debt | 2,834 |  | 2,834 |  | 2,136
Member's Equity | 5,967 |  | 5,967 |  | 5,967
TOTAL LIABILITIES AND CAPITALIZATION | $ 12,681 |  | $ 12,681 |  | $ 12,418

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