Condensed Consolidated Statements Of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net Income	$ 347	$ 294	$ 1,051	$ 1,143
Other Comprehensive Income (Loss), net of tax
Available-for-Sale Securities, net of tax (expense) benefit for the three and nine months ended 2012 and 2011, respectively	(10)	(58)	12	(73)
Change in Fair Value of Derivative Instruments, net of tax (expense) benefit for the three and nine months ended 2012 and 2011, respectively	(2)	12	13	11
Reclassification Adjustments for Net Amounts included in Net Income, net of tax (expense) benefit for the three and nine months ended 2012 and 2011, respectively	(8)	(35)	(33)	(91)
Pension/OPEB adjustment, net of tax (expense) benefit for the three and nine months ended 2012 and 2011, respectively	8	4	23	53
Other Comprehensive Income (Loss), net of tax	(12)	(77)	15	(100)
COMPREHENSIVE INCOME	335	217	1,066	1,043
Power [Member]
Net Income	181	302	538	871
Other Comprehensive Income (Loss), net of tax
Available-for-Sale Securities, net of tax (expense) benefit for the three and nine months ended 2012 and 2011, respectively	(11)	(60)	11	(77)
Change in Fair Value of Derivative Instruments, net of tax (expense) benefit for the three and nine months ended 2012 and 2011, respectively	(2)	12	13	11
Reclassification Adjustments for Net Amounts included in Net Income, net of tax (expense) benefit for the three and nine months ended 2012 and 2011, respectively	(9)	(35)	(34)	(91)
Pension/OPEB adjustment, net of tax (expense) benefit for the three and nine months ended 2012 and 2011, respectively	7	3	21	45
Other Comprehensive Income (Loss), net of tax	(15)	(80)	11	(112)
COMPREHENSIVE INCOME	166	222	549	759
PSE And G [Member]
Net Income	155	154	453	422
Other Comprehensive Income (Loss), net of tax
Available-for-Sale Securities, net of tax (expense) benefit for the three and nine months ended 2012 and 2011, respectively	1	1	0	2
COMPREHENSIVE INCOME	$ 156	$ 155	$ 453	$ 424