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Guarantees of Debt (Tables) | 6 Months Ended
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Jun. 30, 2018
Power [Member] |
Debt Instrument [Line Items] |
Schedule Of Financial Statements Of Guarantors | The following tables present condensed financial information for the guarantor subsidiaries, as well as Power’s non-guarantor subsidiaries, as of June 30, 2018 and December 31, 2017 and for the three months and six months ended June 30, 2018 and 2017.
|  | Power |  | Guarantor Subsidiaries |  | Other Subsidiaries |  | Consolidating Adjustments |  | Total |
|  | Millions |
| Three Months Ended June 30, 2018 |  |  |  |  |  |  |  |  |  |
| Operating Revenues | $ | — |  |  | $ | 747 |  |  | $ | 51 |  |  | $ | (31 | ) |  | $ | 767 |  |
| Operating Expenses | 3 |  |  | 704 |  |  | 49 |  |  | (31 | ) |  | 725 |  |
| Operating Income (Loss) | (3 | ) |  | 43 |  |  | 2 |  |  | — |  |  | 42 |  |
| Equity Earnings (Losses) of Subsidiaries | 55 |  |  | (4 | ) |  | 5 |  |  | (51 | ) |  | 5 |  |
| Net Gains (Losses) on Trust Investments | — |  |  | 8 |  |  | — |  |  | — |  |  | 8 |  |
| Other Income (Deductions) | 41 |  |  | 40 |  |  | — |  |  | (68 | ) |  | 13 |  |
| Non-Operating Pension and OPEB Credits (Costs) | — |  |  | 2 |  |  | 1 |  |  | — |  |  | 3 |  |
| Interest Expense | (54 | ) |  | (19 | ) |  | (6 | ) |  | 68 |  |  | (11 | ) |
| Income Tax Benefit (Expense) | 2 |  |  | (23 | ) |  | 2 |  |  | — |  |  | (19 | ) |
| Net Income (Loss) | $ | 41 |  |  | $ | 47 |  |  | $ | 4 |  |  | $ | (51 | ) |  | $ | 41 |  |
| Comprehensive Income (Loss) | $ | 43 |  |  | $ | 44 |  |  | $ | 4 |  |  | $ | (48 | ) |  | $ | 43 |  |
| Six Months Ended June 30, 2018 |  |  |  |  |  |  |  |  |  |
| Operating Revenues | $ | — |  |  | $ | 2,133 |  |  | $ | 102 |  |  | $ | (65 | ) |  | $ | 2,170 |  |
| Operating Expenses | 3 |  |  | 1,760 |  |  | 101 |  |  | (65 | ) |  | 1,799 |  |
| Operating Income (Loss) | (3 | ) |  | 373 |  |  | 1 |  |  | — |  |  | 371 |  |
| Equity Earnings (Losses) of Subsidiaries | 289 |  |  | (7 | ) |  | 7 |  |  | (282 | ) |  | 7 |  |
| Net Gains (Losses) on Trust Investments | — |  |  | (14 | ) |  | — |  |  | — |  |  | (14 | ) |
| Other Income (Deductions) | 76 |  |  | 73 |  |  | — |  |  | (125 | ) |  | 24 |  |
| Non-Operating Pension and OPEB Credits (Costs) | — |  |  | 6 |  |  | 1 |  |  | — |  |  | 7 |  |
| Interest Expense | (96 | ) |  | (36 | ) |  | (11 | ) |  | 125 |  |  | (18 | ) |
| Income Tax Benefit (Expense) | 9 |  |  | (115 | ) |  | 4 |  |  | — |  |  | (102 | ) |
| Net Income (Loss) | $ | 275 |  |  | $ | 280 |  |  | $ | 2 |  |  | $ | (282 | ) |  | $ | 275 |  |
| Comprehensive Income (Loss) | $ | 272 |  |  | $ | 267 |  |  | $ | 2 |  |  | $ | (269 | ) |  | $ | 272 |  |
| Six Months Ended June 30, 2018 |  |  |  |  |  |  |  |  |  |
| Net Cash Provided By (Used In) Operating Activities | $ | 34 |  |  | $ | 745 |  |  | $ | (8 | ) |  | $ | 98 |  |  | $ | 869 |  |
| Net Cash Provided By (Used In) Investing Activities | $ | (840 | ) |  | $ | (867 | ) |  | $ | (196 | ) |  | $ | 808 |  |  | $ | (1,095 | ) |
| Net Cash Provided By (Used In) Financing Activities | $ | 806 |  |  | $ | 123 |  |  | $ | 191 |  |  | $ | (906 | ) |  | $ | 214 |  |
|  | Power |  | Guarantor Subsidiaries |  | Other Subsidiaries |  | Consolidating Adjustments |  | Total |
|  | Millions |
| Three Months Ended June 30, 2017 |  |  |  |  |  |  |  |  |  |
| Operating Revenues | $ | — |  |  | $ | 899 |  |  | $ | 47 |  |  | $ | (28 | ) |  | $ | 918 |  |
| Operating Expenses | (2 | ) |  | 1,094 |  |  | 43 |  |  | (28 | ) |  | 1,107 |  |
| Operating Income (Loss) | 2 |  |  | (195 | ) |  | 4 |  |  | — |  |  | (189 | ) |
| Equity Earnings (Losses) of Subsidiaries | (93 | ) |  | (4 | ) |  | 5 |  |  | 97 |  |  | 5 |  |
| Net Gains (Losses) on Trust Investments | (1 | ) |  | 25 |  |  | — |  |  | — |  |  | 24 |  |
| Other Income (Deductions) | 23 |  |  | 21 |  |  | 2 |  |  | (34 | ) |  | 12 |  |
| Non-Operating Pension and OPEB Credits (Costs) | — |  |  | 2 |  |  | — |  |  | — |  |  | 2 |  |
| Interest Expense | (34 | ) |  | (9 | ) |  | (4 | ) |  | 34 |  |  | (13 | ) |
| Income Tax Benefit (Expense) | 6 |  |  | 60 |  |  | (4 | ) |  | — |  |  | 62 |  |
| Net Income (Loss) | $ | (97 | ) |  | $ | (100 | ) |  | $ | 3 |  |  | $ | 97 |  |  | $ | (97 | ) |
| Comprehensive Income (Loss) | $ | (82 | ) |  | $ | (91 | ) |  | $ | 3 |  |  | $ | 88 |  |  | $ | (82 | ) |
| Six Months Ended June 30, 2017 |  |  |  |  |  |  |  |  |  |
| Operating Revenues | $ | — |  |  | $ | 2,154 |  |  | $ | 99 |  |  | $ | (66 | ) |  | $ | 2,187 |  |
| Operating Expenses | 2 |  |  | 2,650 |  |  | 95 |  |  | (66 | ) |  | 2,681 |  |
| Operating Income (Loss) | (2 | ) |  | (496 | ) |  | 4 |  |  | — |  |  | (494 | ) |
| Equity Earnings (Losses) of Subsidiaries | (254 | ) |  | (5 | ) |  | 8 |  |  | 259 |  |  | 8 |  |
| Net Gains (Losses) on Trust Investments | 3 |  |  | 40 |  |  | — |  |  | — |  |  | 43 |  |
| Other Income (Deductions) | 43 |  |  | 40 |  |  | 2 |  |  | (62 | ) |  | 23 |  |
| Non-Operating Pension and OPEB Credits (Costs) | — |  |  | 4 |  |  | — |  |  | — |  |  | 4 |  |
| Interest Expense | (64 | ) |  | (18 | ) |  | (9 | ) |  | 62 |  |  | (29 | ) |
| Income Tax Benefit (Expense) | 7 |  |  | 171 |  |  | — |  |  | — |  |  | 178 |  |
| Net Income (Loss) | $ | (267 | ) |  | $ | (264 | ) |  | $ | 5 |  |  | $ | 259 |  |  | $ | (267 | ) |
| Comprehensive Income (Loss) | $ | (228 | ) |  | $ | (234 | ) |  | $ | 5 |  |  | $ | 229 |  |  | $ | (228 | ) |
| Three Months Ended June 30, 2017 |  |  |  |  |  |  |  |  |  |
| Net Cash Provided By (Used In) Operating Activities | $ | (32 | ) |  | $ | 802 |  |  | $ | 111 |  |  | $ | 51 |  |  | $ | 932 |  |
| Net Cash Provided By (Used In) Investing Activities | $ | 683 |  |  | $ | 178 |  |  | $ | (241 | ) |  | $ | (1,355 | ) |  | $ | (735 | ) |
| Net Cash Provided By (Used In) Financing Activities | $ | (651 | ) |  | $ | (978 | ) |  | $ | 146 |  |  | $ | 1,304 |  |  | $ | (179 | ) |
|  | Power |  | Guarantor Subsidiaries |  | Other Subsidiaries |  | Consolidating Adjustments |  | Total |
|  | Millions |
| As of June 30, 2018 |  |  |  |  |  |  |  |  |  |
| Current Assets | $ | 4,806 |  |  | $ | 1,411 |  |  | $ | 216 |  |  | $ | (4,868 | ) |  | $ | 1,565 |  |
| Property, Plant and Equipment, net | 52 |  |  | 5,048 |  |  | 3,679 |  |  | — |  |  | 8,779 |  |
| Investment in Subsidiaries | 4,977 |  |  | 1,129 |  |  | — |  |  | (6,106 | ) |  | — |  |
| Noncurrent Assets | 243 |  |  | 2,258 |  |  | 110 |  |  | (183 | ) |  | 2,428 |  |
| Total Assets | $ | 10,078 |  |  | $ | 9,846 |  |  | $ | 4,005 |  |  | $ | (11,157 | ) |  | $ | 12,772 |  |
| Current Liabilities | $ | 690 |  |  | $ | 3,164 |  |  | $ | 1,987 |  |  | $ | (4,868 | ) |  | $ | 973 |  |
| Noncurrent Liabilities | 516 |  |  | 2,097 |  |  | 497 |  |  | (183 | ) |  | 2,927 |  |
| Long-Term Debt | 2,833 |  |  | — |  |  | — |  |  | — |  |  | 2,833 |  |
| Member’s Equity | 6,039 |  |  | 4,585 |  |  | 1,521 |  |  | (6,106 | ) |  | 6,039 |  |
| Total Liabilities and Member’s Equity | $ | 10,078 |  |  | $ | 9,846 |  |  | $ | 4,005 |  |  | $ | (11,157 | ) |  | $ | 12,772 |  |
| As of December 31, 2017 |  |  |  |  |  |  |  |  |  |
| Current Assets | $ | 4,327 |  |  | $ | 1,500 |  |  | $ | 200 |  |  | $ | (4,686 | ) |  | $ | 1,341 |  |
| Property, Plant and Equipment, net | 54 |  |  | 5,778 |  |  | 2,764 |  |  | — |  |  | 8,596 |  |
| Investment in Subsidiaries | 4,844 |  |  | 404 |  |  | — |  |  | (5,248 | ) |  | — |  |
| Noncurrent Assets | 100 |  |  | 2,349 |  |  | 110 |  |  | (78 | ) |  | 2,481 |  |
| Total Assets | $ | 9,325 |  |  | $ | 10,031 |  |  | $ | 3,074 |  |  | $ | (10,012 | ) |  | $ | 12,418 |  |
| Current Liabilities | $ | 689 |  |  | $ | 3,586 |  |  | $ | 1,846 |  |  | $ | (4,686 | ) |  | $ | 1,435 |  |
| Noncurrent Liabilities | 533 |  |  | 1,966 |  |  | 459 |  |  | (78 | ) |  | 2,880 |  |
| Long-Term Debt | 2,136 |  |  | — |  |  | — |  |  | — |  |  | 2,136 |  |
| Member’s Equity | 5,967 |  |  | 4,479 |  |  | 769 |  |  | (5,248 | ) |  | 5,967 |  |
| Total Liabilities and Member’s Equity | $ | 9,325 |  |  | $ | 10,031 |  |  | $ | 3,074 |  |  | $ | (10,012 | ) |  | $ | 12,418 |  |

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