Condensed Consolidated Statements Of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
NET INCOME	$ 493	$ 526
Other Comprehensive Income, net of tax
Available-for-Sale Securities, net of tax	37	(5)
Change in Fair Value of Derivative Instruments, net of tax	20	9
Reclassification Adjustments for Net Amounts included in Net Income, net of tax	(20)	(41)
Pension/OPEB adjustment, net of tax	7	6
Other Comprehensive Income, net of tax	44	(31)
COMPREHENSIVE INCOME	537	495
Power [Member]
NET INCOME	253	362
Other Comprehensive Income, net of tax
Available-for-Sale Securities, net of tax	37	(7)
Change in Fair Value of Derivative Instruments, net of tax	20	9
Reclassification Adjustments for Net Amounts included in Net Income, net of tax	(20)	(41)
Pension/OPEB adjustment, net of tax	7	6
Other Comprehensive Income, net of tax	44	(33)
COMPREHENSIVE INCOME	297	329
PSE And G [Member]
NET INCOME	197	163
Other Comprehensive Income, net of tax
Available-for-Sale Securities, net of tax	(1)	1
COMPREHENSIVE INCOME	$ 196	$ 164