Condensed Consolidated Statements Of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net Income	$ 211	$ 323	$ 704	$ 849
Other Comprehensive Income (Loss), net of tax
Available-for-Sale Securities, net of tax of $(17), $(10), $22 and $(19) for the three and six months ended 2012 and 2011, respectively	(15)	(10)	22	(15)
Change in Fair Value of Derivative Instruments, net of tax of $(3), $(7), $11 and $(1) for the three and six months ended 2012 and 2011, respectively	(5)	(10)	15	(1)
Reclassification Adjustments for Net Amounts included in Net Income, net of tax of $(2), $(9), $(17) and $(37) for the three and six months ended 2012 and 2011, respectively	(5)	(15)	(25)	(56)
Pension/OPEB adjustment, net of tax of $5, $24, $10 and $28 for the three and six months ended 2012 and 2011, respectively	8	43	15	49
Other Comprehensive Income (Loss), net of tax	(17)	8	27	(23)
COMPREHENSIVE INCOME	194	331	731	826
Power [Member]
Net Income	104	208	357	569
Other Comprehensive Income (Loss), net of tax
Available-for-Sale Securities, net of tax of $(17), $(10), $22 and $(19) for the three and six months ended 2012 and 2011, respectively	(15)	(10)	22	(17)
Change in Fair Value of Derivative Instruments, net of tax of $(3), $(7), $11 and $(1) for the three and six months ended 2012 and 2011, respectively	(5)	(10)	15	(1)
Reclassification Adjustments for Net Amounts included in Net Income, net of tax of $(2), $(9), $(17) and $(37) for the three and six months ended 2012 and 2011, respectively	(5)	(15)	(25)	(56)
Pension/OPEB adjustment, net of tax of $5, $24, $10 and $28 for the three and six months ended 2012 and 2011, respectively	7	36	14	42
Other Comprehensive Income (Loss), net of tax	(18)	1	26	(32)
COMPREHENSIVE INCOME	86	209	383	537
PSE And G [Member]
Net Income	101	105	298	268
Other Comprehensive Income (Loss), net of tax
Available-for-Sale Securities, net of tax of $(17), $(10), $22 and $(19) for the three and six months ended 2012 and 2011, respectively	0	0	(1)	1
COMPREHENSIVE INCOME	$ 101	$ 105	$ 297	$ 269