Condensed Consolidated Statements Of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operating Revenues	$ 2,016	$ 2,142	$ 4,834	$ 4,733
Operating Expenses [Abstract]
Energy Costs	600	588	1,552	1,456
Operation and Maintenance	725	718	1,479	1,435
Depreciation and Amortization	280	641	560	1,469
Total Operating Expenses	1,605	1,947	3,591	4,360
OPERATING INCOME (LOSS)	411	195	1,243	373
Income from Equity Method Investments	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 Before Income Taxes	366	168	1,126	311
Income Tax Benefit (Expense)	(97)	(59)	(299)	(88)
Net Income (Loss)	$ 269	$ 109	$ 827	$ 223
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
BASIC (shares)	504	505	504	505
DILUTED (shares)	507	507	507	507
EARNINGS PER SHARE:
BASIC (dollars per share)	$ 0.53	$ 0.22	$ 1.64	$ 0.44
DILUTED (dollars per share)	0.53	0.22	1.63	0.44
DIVIDENDS PAID PER SHARE OF COMMON STOCK (in dollars per share)	$ 0.45	$ 0.43	$ 0.90	$ 0.86
PSE And G [Member]
Operating Revenues	$ 1,386	$ 1,393	$ 3,231	$ 3,219
Operating Expenses [Abstract]
Energy Costs	488	488	1,270	1,250
Operation and Maintenance	353	359	744	729
Depreciation and Amortization	187	166	377	337
Total Operating Expenses	1,028	1,013	2,391	2,316
OPERATING INCOME (LOSS)	358	380	840	903
Net Gains (Losses) on Trust Investments	0	0	0	2
Other Income (Deductions)	20	21	40	43
Non-Operating Pension and OPEB Credits (Costs)	15	(1)	30	(3)
Interest Expense	(82)	(69)	(163)	(144)
Income Before Income Taxes	311	331	747	801
Income Tax Benefit (Expense)	(80)	(123)	(197)	(294)
Net Income (Loss)	231	208	550	507
Power [Member]
Operating Revenues	767	918	2,170	2,187
Operating Expenses [Abstract]
Energy Costs	373	386	1,119	1,078
Operation and Maintenance	268	256	514	488
Depreciation and Amortization	84	465	166	1,115
Total Operating Expenses	725	1,107	1,799	2,681
OPERATING INCOME (LOSS)	42	(189)	371	(494)
Income from Equity Method Investments	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 Before Income Taxes	60	(159)	377	(445)
Income Tax Benefit (Expense)	(19)	62	(102)	178
Net Income (Loss)	$ 41	$ (97)	$ 275	$ (267)