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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |
Operating Revenues | $ 2,016 | $ 2,142 | $ 4,834 | $ 4,733 |
Operating Expenses | 1,605 | 1,947 | 3,591 | 4,360 |
Operating Income (Loss) | 411 | 195 | 1,243 | 373 |
Equity Earnings (Losses) of Subsidiaries | 5 | 5 | 7 | 8 |
Net Gains (Losses) on Trust Investments | 8 | 25 | (14) | 53 |
Other Income (Deductions) | 34 | 33 | 66 | 65 |
Non-Operating Pension and OPEB Credits (Costs) | 19 | 1 | 38 | 1 |
Interest Expense | (111) | (91) | (214) | (189) |
Income Tax Benefit (Expense) | (97) | (59) | (299) | (88) |
Net Income (Loss) | 269 | 109 | 827 | 223 |
Net Cash Provided By (Used In) Operating Activities |  |  | 1,633 | 1,755 |
Net Cash Provided By (Used In) Investing Activities |  |  | (2,027) | (1,989) |
Net Cash Provided By (Used In) Financing Activities |  |  | 190 | 240 |
Current Assets | 3,005 |  | 3,005 |  | $ 3,312
Property, Plant and Equipment, net | 33,151 |  | 33,151 |  | 31,797
Noncurrent Assets | 7,551 |  | 7,551 |  | 7,607
Total Assets | 43,707 |  | 43,707 |  | 42,716
Current Liabilities | 4,244 |  | 4,244 |  | 4,168
Noncurrent Liabilities | 12,795 |  | 12,795 |  | 12,633
Long-Term Debt | 12,510 |  | 12,510 |  | 12,068
Member's Equity | 14,158 |  | 14,158 |  | 13,847
TOTAL LIABILITIES AND CAPITALIZATION | 43,707 |  | 43,707 |  | 42,716
Power [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Operating Revenues | 767 | 918 | 2,170 | 2,187 |
Operating Expenses | 725 | 1,107 | 1,799 | 2,681 |
Operating Income (Loss) | 42 | (189) | 371 | (494) |
Equity Earnings (Losses) of Subsidiaries | 5 | 5 | 7 | 8 |
Net Gains (Losses) on Trust Investments | 8 | 24 | (14) | 43 |
Other Income (Deductions) | 13 | 12 | 24 | 23 |
Non-Operating Pension and OPEB Credits (Costs) | 3 | 2 | 7 | 4 |
Interest Expense | (11) | (13) | (18) | (29) |
Income Tax Benefit (Expense) | (19) | 62 | (102) | 178 |
Net Income (Loss) | 41 | (97) | 275 | (267) |
Net Cash Provided By (Used In) Operating Activities |  |  | 869 | 932 |
Net Cash Provided By (Used In) Investing Activities |  |  | (1,095) | (735) |
Net Cash Provided By (Used In) Financing Activities |  |  | 214 | (179) |
Current Assets | 1,565 |  | 1,565 |  | 1,341
Property, Plant and Equipment, net | 8,779 |  | 8,779 |  | 8,596
Noncurrent Assets | 2,428 |  | 2,428 |  | 2,481
Total Assets | 12,772 |  | 12,772 |  | 12,418
Current Liabilities | 973 |  | 973 |  | 1,435
Noncurrent Liabilities | 2,927 |  | 2,927 |  | 2,880
Long-Term Debt | 2,833 |  | 2,833 |  | 2,136
Member's Equity | 6,039 |  | 6,039 |  | 5,967
TOTAL LIABILITIES AND CAPITALIZATION | 12,772 |  | 12,772 |  | 12,418
Power Senior Notes [Member] | Consolidating Adjustments [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Operating Revenues | (31) | (28) | (65) | (66) |
Operating Expenses | (31) | (28) | (65) | (66) |
Operating Income (Loss) | 0 | 0 | 0 | 0 |
Equity Earnings (Losses) of Subsidiaries | (51) | 97 | (282) | 259 |
Net Gains (Losses) on Trust Investments | 0 | 0 | 0 | 0 |
Other Income (Deductions) | (68) | (34) | (125) | (62) |
Non-Operating Pension and OPEB Credits (Costs) | 0 | 0 | 0 | 0 |
Interest Expense | 68 | 34 | 125 | 62 |
Income Tax Benefit (Expense) | 0 | 0 | 0 | 0 |
Net Income (Loss) | (51) | 97 | (282) | 259 |
Comprehensive Income (Loss) | (48) | 88 | (269) | 229 |
Net Cash Provided By (Used In) Operating Activities |  |  | 98 | 51 |
Net Cash Provided By (Used In) Investing Activities |  |  | 808 | (1,355) |
Net Cash Provided By (Used In) Financing Activities |  |  | (906) | 1,304 |
Current Assets | (4,868) |  | (4,868) |  | (4,686)
Property, Plant and Equipment, net | 0 |  | 0 |  | 0
Investment in Subsidiaries | (6,106) |  | (6,106) |  | (5,248)
Noncurrent Assets | (183) |  | (183) |  | (78)
Total Assets | (11,157) |  | (11,157) |  | (10,012)
Current Liabilities | (4,868) |  | (4,868) |  | (4,686)
Noncurrent Liabilities | (183) |  | (183) |  | (78)
Long-Term Debt | 0 |  | 0 |  | 0
Member's Equity | (6,106) |  | (6,106) |  | (5,248)
TOTAL LIABILITIES AND CAPITALIZATION | (11,157) |  | (11,157) |  | (10,012)
Power Senior Notes [Member] | Guarantor Subsidiaries [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Operating Revenues | 747 | 899 | 2,133 | 2,154 |
Operating Expenses | 704 | 1,094 | 1,760 | 2,650 |
Operating Income (Loss) | 43 | (195) | 373 | (496) |
Equity Earnings (Losses) of Subsidiaries | (4) | (4) | (7) | (5) |
Net Gains (Losses) on Trust Investments | 8 | 25 | (14) | 40 |
Other Income (Deductions) | 40 | 21 | 73 | 40 |
Non-Operating Pension and OPEB Credits (Costs) | 2 | 2 | 6 | 4 |
Interest Expense | (19) | (9) | (36) | (18) |
Income Tax Benefit (Expense) | (23) | 60 | (115) | 171 |
Net Income (Loss) | 47 | (100) | 280 | (264) |
Comprehensive Income (Loss) | 44 | (91) | 267 | (234) |
Net Cash Provided By (Used In) Operating Activities |  |  | 745 | 802 |
Net Cash Provided By (Used In) Investing Activities |  |  | (867) | 178 |
Net Cash Provided By (Used In) Financing Activities |  |  | 123 | (978) |
Current Assets | 1,411 |  | 1,411 |  | 1,500
Property, Plant and Equipment, net | 5,048 |  | 5,048 |  | 5,778
Investment in Subsidiaries | 1,129 |  | 1,129 |  | 404
Noncurrent Assets | 2,258 |  | 2,258 |  | 2,349
Total Assets | 9,846 |  | 9,846 |  | 10,031
Current Liabilities | 3,164 |  | 3,164 |  | 3,586
Noncurrent Liabilities | 2,097 |  | 2,097 |  | 1,966
Long-Term Debt | 0 |  | 0 |  | 0
Member's Equity | 4,585 |  | 4,585 |  | 4,479
TOTAL LIABILITIES AND CAPITALIZATION | 9,846 |  | 9,846 |  | 10,031
Power Senior Notes [Member] | Non-Guarantor Subsidiaries [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Operating Revenues | 51 | 47 | 102 | 99 |
Operating Expenses | 49 | 43 | 101 | 95 |
Operating Income (Loss) | 2 | 4 | 1 | 4 |
Equity Earnings (Losses) of Subsidiaries | 5 | 5 | 7 | 8 |
Net Gains (Losses) on Trust Investments | 0 | 0 | 0 | 0 |
Other Income (Deductions) | 0 | 2 | 0 | 2 |
Non-Operating Pension and OPEB Credits (Costs) | 1 | 0 | 1 | 0 |
Interest Expense | (6) | (4) | (11) | (9) |
Income Tax Benefit (Expense) | 2 | (4) | 4 | 0 |
Net Income (Loss) | 4 | 3 | 2 | 5 |
Comprehensive Income (Loss) | 4 | 3 | 2 | 5 |
Net Cash Provided By (Used In) Operating Activities |  |  | (8) | 111 |
Net Cash Provided By (Used In) Investing Activities |  |  | (196) | (241) |
Net Cash Provided By (Used In) Financing Activities |  |  | 191 | 146 |
Current Assets | 216 |  | 216 |  | 200
Property, Plant and Equipment, net | 3,679 |  | 3,679 |  | 2,764
Investment in Subsidiaries | 0 |  | 0 |  | 0
Noncurrent Assets | 110 |  | 110 |  | 110
Total Assets | 4,005 |  | 4,005 |  | 3,074
Current Liabilities | 1,987 |  | 1,987 |  | 1,846
Noncurrent Liabilities | 497 |  | 497 |  | 459
Long-Term Debt | 0 |  | 0 |  | 0
Member's Equity | 1,521 |  | 1,521 |  | 769
TOTAL LIABILITIES AND CAPITALIZATION | 4,005 |  | 4,005 |  | 3,074
Power Senior Notes [Member] | Power Parent [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Operating Revenues | 0 | 0 | 0 | 0 |
Operating Expenses | 3 | (2) | 3 | 2 |
Operating Income (Loss) | (3) | 2 | (3) | (2) |
Equity Earnings (Losses) of Subsidiaries | 55 | (93) | 289 | (254) |
Net Gains (Losses) on Trust Investments | 0 | (1) | 0 | 3 |
Other Income (Deductions) | 41 | 23 | 76 | 43 |
Non-Operating Pension and OPEB Credits (Costs) | 0 | 0 | 0 | 0 |
Interest Expense | (54) | (34) | (96) | (64) |
Income Tax Benefit (Expense) | 2 | 6 | 9 | 7 |
Net Income (Loss) | 41 | (97) | 275 | (267) |
Comprehensive Income (Loss) | 43 | (82) | 272 | (228) |
Net Cash Provided By (Used In) Operating Activities |  |  | 34 | (32) |
Net Cash Provided By (Used In) Investing Activities |  |  | (840) | 683 |
Net Cash Provided By (Used In) Financing Activities |  |  | 806 | (651) |
Current Assets | 4,806 |  | 4,806 |  | 4,327
Property, Plant and Equipment, net | 52 |  | 52 |  | 54
Investment in Subsidiaries | 4,977 |  | 4,977 |  | 4,844
Noncurrent Assets | 243 |  | 243 |  | 100
Total Assets | 10,078 |  | 10,078 |  | 9,325
Current Liabilities | 690 |  | 690 |  | 689
Noncurrent Liabilities | 516 |  | 516 |  | 533
Long-Term Debt | 2,833 |  | 2,833 |  | 2,136
Member's Equity | 6,039 |  | 6,039 |  | 5,967
TOTAL LIABILITIES AND CAPITALIZATION | 10,078 |  | 10,078 |  | 9,325
Power Senior Notes [Member] | Power [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Operating Revenues | 767 | 918 | 2,170 | 2,187 |
Operating Expenses | 725 | 1,107 | 1,799 | 2,681 |
Operating Income (Loss) | 42 | (189) | 371 | (494) |
Equity Earnings (Losses) of Subsidiaries | 5 | 5 | 7 | 8 |
Net Gains (Losses) on Trust Investments | 8 | 24 | (14) | 43 |
Other Income (Deductions) | 13 | 12 | 24 | 23 |
Non-Operating Pension and OPEB Credits (Costs) | 3 | 2 | 7 | 4 |
Interest Expense | (11) | (13) | (18) | (29) |
Income Tax Benefit (Expense) | (19) | 62 | (102) | 178 |
Net Income (Loss) | 41 | (97) | 275 | (267) |
Comprehensive Income (Loss) | 43 | $ (82) | 272 | (228) |
Net Cash Provided By (Used In) Operating Activities |  |  | 869 | 932 |
Net Cash Provided By (Used In) Investing Activities |  |  | (1,095) | (735) |
Net Cash Provided By (Used In) Financing Activities |  |  | 214 | $ (179) |
Current Assets | 1,565 |  | 1,565 |  | 1,341
Property, Plant and Equipment, net | 8,779 |  | 8,779 |  | 8,596
Investment in Subsidiaries | 0 |  | 0 |  | 0
Noncurrent Assets | 2,428 |  | 2,428 |  | 2,481
Total Assets | 12,772 |  | 12,772 |  | 12,418
Current Liabilities | 973 |  | 973 |  | 1,435
Noncurrent Liabilities | 2,927 |  | 2,927 |  | 2,880
Long-Term Debt | 2,833 |  | 2,833 |  | 2,136
Member's Equity | 6,039 |  | 6,039 |  | 5,967
TOTAL LIABILITIES AND CAPITALIZATION | $ 12,772 |  | $ 12,772 |  | $ 12,418

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