Condensed Consolidated Statements Of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Operating Revenues	$ 2,263	$ 2,450	$ 6,988	$ 6,971
Operating Expenses [Abstract]
Energy Costs	638	866	2,100	2,326
Operation and Maintenance	680	776	2,100	2,215
Depreciation and Amortization	252	231	1,721	679
Total Operating Expenses	1,570	1,873	5,921	5,220
OPERATING INCOME (LOSS)	693	577	1,067	1,751
Income from Equity Method Investments	3	3	11	9
Other Income	66	47	208	139
Other Deductions	(10)	(8)	(30)	(39)
Other-Than-Temporary Impairments	(5)	(5)	(9)	(25)
Interest Expense	(100)	(99)	(289)	(288)
INCOME (LOSS) BEFORE INCOME TAXES	647	515	958	1,547
Income Tax Benefit (Expense)	(252)	(188)	(340)	(562)
Net Income (Loss)	$ 395	$ 327	$ 618	$ 985
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
BASIC (shares)	505	505	505	505
DILUTED (shares)	507	508	507	508
EARNINGS PER SHARE:
BASIC (dollars per share)	$ 0.78	$ 0.65	$ 1.22	$ 1.95
DILUTED (dollars per share)	0.78	0.64	1.22	1.94
DIVIDENDS PAID PER SHARE OF COMMON STOCK (in dollars per share)	$ 0.43	$ 0.41	$ 1.29	$ 1.23
PSE And G [Member]
Operating Revenues	$ 1,509	$ 1,684	$ 4,689	$ 4,746
Operating Expenses [Abstract]
Energy Costs	535	721	1,760	1,979
Operation and Maintenance	346	376	1,064	1,110
Depreciation and Amortization	169	137	506	412
Total Operating Expenses	1,050	1,234	3,330	3,501
OPERATING INCOME (LOSS)	459	450	1,359	1,245
Other Income	23	22	70	61
Other Deductions	(1)	(1)	(3)	(3)
Interest Expense	(79)	(72)	(223)	(214)
INCOME (LOSS) BEFORE INCOME TAXES	402	399	1,203	1,089
Income Tax Benefit (Expense)	(156)	(144)	(450)	(393)
Net Income (Loss)	246	255	753	696
Power [Member]
Operating Revenues	873	1,075	3,086	3,102
Operating Expenses [Abstract]
Energy Costs	357	462	1,461	1,481
Operation and Maintenance	227	289	711	807
Depreciation and Amortization	76	86	1,191	245
Total Operating Expenses	660	837	3,363	2,533
OPERATING INCOME (LOSS)	213	238	(277)	569
Income from Equity Method Investments	3	3	11	9
Other Income	43	23	127	74
Other Deductions	(8)	(6)	(22)	(33)
Other-Than-Temporary Impairments	(5)	(5)	(9)	(25)
Interest Expense	(12)	(24)	(41)	(66)
INCOME (LOSS) BEFORE INCOME TAXES	234	229	(211)	528
Income Tax Benefit (Expense)	(98)	(90)	80	(208)
Net Income (Loss)	$ 136	$ 139	$ (131)	$ 320