Condensed Consolidated Statements Of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Operating Revenues	$ 2,394	$ 2,254	$ 7,228	$ 6,987
Operating Expenses [Abstract]
Energy Costs	804	616	2,356	2,072
Operation and Maintenance	742	693	2,221	2,128
Depreciation and Amortization	294	252	854	1,721
Total Operating Expenses	1,840	1,561	5,431	5,921
OPERATING INCOME (LOSS)	554	693	1,797	1,066
Income from Equity Method Investments	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 Before Income Taxes	529	647	1,655	958
Income Tax Benefit (Expense)	(117)	(252)	(416)	(340)
Net Income (Loss)	$ 412	$ 395	$ 1,239	$ 618
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
BASIC (shares)	504	505	504	505
DILUTED (shares)	507	507	507	507
EARNINGS PER SHARE:
BASIC (dollars per share)	$ 0.82	$ 0.78	$ 2.46	$ 1.22
DILUTED (dollars per share)	0.81	0.78	2.44	1.22
DIVIDENDS PAID PER SHARE OF COMMON STOCK (in dollars per share)	$ 0.45	$ 0.43	$ 1.35	$ 1.29
PSE And G [Member]
Operating Revenues	$ 1,595	$ 1,530	$ 4,826	$ 4,749
Operating Expenses [Abstract]
Energy Costs	593	543	1,863	1,793
Operation and Maintenance	389	357	1,133	1,086
Depreciation and Amortization	192	169	569	506
Total Operating Expenses	1,174	1,069	3,565	3,385
OPERATING INCOME (LOSS)	421	461	1,261	1,364
Net Gains (Losses) on Trust Investments	0	0	0	2
Other Income (Deductions)	21	22	61	65
Non-Operating Pension and OPEB Credits (Costs)	14	(2)	44	(5)
Interest Expense	(83)	(79)	(246)	(223)
Income Before Income Taxes	373	402	1,120	1,203
Income Tax Benefit (Expense)	(95)	(156)	(292)	(450)
Net Income (Loss)	278	246	828	753
Power [Member]
Operating Revenues	868	846	3,038	3,033
Operating Expenses [Abstract]
Energy Costs	431	330	1,550	1,408
Operation and Maintenance	231	229	745	717
Depreciation and Amortization	94	76	260	1,191
Total Operating Expenses	756	635	2,555	3,316
OPERATING INCOME (LOSS)	112	211	483	(283)
Income from Equity Method Investments	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 Before Income Taxes	150	234	527	(211)
Income Tax Benefit (Expense)	(25)	(98)	(127)	80
Net Income (Loss)	$ 125	$ 136	$ 400	$ (131)