Trust Investments (Fair Values And Gross Unrealized Gains And Losses For The Securities Held) (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2019	Dec. 31, 2018
Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member]
Schedule of Trust Investments [Line Items]
Trust Investments, Cost	$ 1,815	$ 1,769
Gross Unrealized Gains	263	192
Gross Unrealized Losses	(29)	(83)
Trust Investments, Fair Value	2,049	1,878
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Trust Investments, Cost	227	228
Gross Unrealized Gains	7	2
Gross Unrealized Losses	(1)	(6)
Trust Investments, Fair Value	233	224
Total Debt Securities [Member] \| Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member]
Schedule of Trust Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	1,004	999
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	12	3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	7	24
Debt Securities, Available-for-Sale, Fair Value	1,009	978
Total Debt Securities [Member] \| Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	205	206
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	4	1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1	6
Debt Securities, Available-for-Sale, Fair Value	208	201
Equity Securities [Member] \| Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member]
Schedule of Trust Investments [Line Items]
Equity Securities, Cost	811	770
Equity Securities, Accumulated Gross Unrealized Gain	251	189
Equity Securities, Accumulated Gross Unrealized Loss	22	59
Equity Securities, Fair Value	1,040	900
Corporate Debt Obligations [Member] \| Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member]
Schedule of Trust Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	495	501
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	6	1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	4	15
Debt Securities, Available-for-Sale, Fair Value	497	487
Corporate Debt Obligations [Member] \| Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	97	96
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	2	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1	4
Debt Securities, Available-for-Sale, Fair Value	98	92
Government Debt Securities [Member] \| Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member]
Schedule of Trust Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	509	498
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	6	2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	3	9
Debt Securities, Available-for-Sale, Fair Value	512	491
Government Debt Securities [Member] \| Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	108	110
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	2	1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	2
Debt Securities, Available-for-Sale, Fair Value	110	109
International Equity Securities [Member] \| Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member]
Schedule of Trust Investments [Line Items]
Equity Securities, Cost	388	323
Equity Securities, Accumulated Gross Unrealized Gain	68	36
Equity Securities, Accumulated Gross Unrealized Loss	16	30
Equity Securities, Fair Value	440	329
Domestic Equity Securities [Member] \| Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member]
Schedule of Trust Investments [Line Items]
Equity Securities, Cost	423	447
Equity Securities, Accumulated Gross Unrealized Gain	183	153
Equity Securities, Accumulated Gross Unrealized Loss	6	29
Equity Securities, Fair Value	600	571
Domestic Equity Securities [Member] \| Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Equity Securities, Cost	22	22
Equity Securities, Accumulated Gross Unrealized Gain	3	1
Equity Securities, Accumulated Gross Unrealized Loss	0	0
Equity Securities, Fair Value	$ 25	$ 23

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of unrealized loss on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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