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Trust Investments (Proceeds From The Sales Of And The Net Realized Gains On Securities in the NDT and Rabbi Trusts) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Schedule of Trust Investments [Line Items] |  |  |  |  |  |  |  |  |
Net Gains (Losses) on Trust Investments |  | $ 8 |  | $ 25 |  | $ (14) |  | $ 53 |
Rabbi Trust [Member] |  |  |  |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Sales |  | 22 | [1] | 93 | [1] | 47 | [2] | 144 | [2]
Gross Realized Gains |  | 0 |  | 2 |  | 2 |  | 17 |
Gross Realized Losses |  | 0 |  | (1) |  | (2) |  | (4) |
Net Realized Gains (Losses) |  | 0 |  | 1 |  | 0 | [3] | 13 | [3]
Unrealized Gain (Loss) on Securities | [4] | 0 |  |  |  | 0 |  |  |
Other than Temporary Impairment Losses, Investments |  | 0 |  | 0 |  | 0 |  | 0 |
Net Gains (Losses) on Trust Investments |  | 0 |  | 1 |  | 0 |  | 13 |
Power [Member] |  |  |  |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |  |  |  |
Net Gains (Losses) on Trust Investments |  | 8 |  | 24 |  | (14) |  | 43 |
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Sales | [1] | 402 |  | 320 |  | 774 |  | 567 |
Gross Realized Gains |  | 34 |  | 32 |  | 58 |  | 53 |
Gross Realized Losses |  | (10) |  | (5) |  | (22) |  | (9) |
Net Realized Gains (Losses) |  | 24 |  | 27 |  | 36 | [5] | 44 | [5]
Unrealized Gain (Loss) on Securities | [6] | (16) |  |  |  | (50) |  |  |
Other than Temporary Impairment Losses, Investments |  | 0 |  | (3) |  | 0 |  | (4) |
Net Gains (Losses) on Trust Investments |  | $ 8 |  | $ 24 |  | $ (14) |  | $ 40 |
[1] | Includes activity in accounts related to the liquidation of funds being transitioned to new managers.
[2] | Includes activity in accounts related to the liquidation of funds being transitioned to new managers.
[3] | The cost of these securities was determined on the basis of specific identification.
[4] | Effective January 1, 2018, unrealized gains (losses) on equity securities are recorded in Net Income instead of Other Comprehensive Income (Loss).
[5] | The cost of these securities was determined on the basis of specific identification.
[6] | Effective January 1, 2018, unrealized gains (losses) on equity securities are recorded in Net Income instead of Other Comprehensive Income (Loss).

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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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- Definition This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c)-(e) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27405-111563 + Details
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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=82895926&loc=d3e25351-111560 + Details
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- Definition The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 325 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75031664&loc=d3e22529-158502 + Details
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- Definition Amount of unrealized gain (loss) recognized in the income statement on unsold other securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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