Condensed Consolidated Statements Of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net Income	$ 320	$ 493
Other Comprehensive Income (Loss), net of tax
Available-for-Sale Securities, net of tax (expense) benefit for the three months ended 2013 and 2012, respectively	27	37
Change in Fair Value of Derivative Instruments, net of tax (expense) benefit for the three months ended 2013 and 2012, respectively	0	20
Reclassification Adjustments for Net Amounts included in Net Income, net of tax (expense) benefit for the three months ended 2013 and 2012, respectively	(4)	(20)
Pension/OPEB adjustment, net of tax (expense) benefit for the three months ended 2013 and 2012, respectively	10	7
Other Comprehensive Income (Loss), net of tax	33	44
COMPREHENSIVE INCOME	353	537
Power [Member]
Net Income	137	253
Other Comprehensive Income (Loss), net of tax
Available-for-Sale Securities, net of tax (expense) benefit for the three months ended 2013 and 2012, respectively	27	37
Change in Fair Value of Derivative Instruments, net of tax (expense) benefit for the three months ended 2013 and 2012, respectively	0	20
Reclassification Adjustments for Net Amounts included in Net Income, net of tax (expense) benefit for the three months ended 2013 and 2012, respectively	(4)	(20)
Pension/OPEB adjustment, net of tax (expense) benefit for the three months ended 2013 and 2012, respectively	9	7
Other Comprehensive Income (Loss), net of tax	32	44
COMPREHENSIVE INCOME	169	297
PSE And G [Member]
Net Income	179	197
Other Comprehensive Income (Loss), net of tax
Available-for-Sale Securities, net of tax (expense) benefit for the three months ended 2013 and 2012, respectively	0	(1)
Other Comprehensive Income (Loss), net of tax		(1)
COMPREHENSIVE INCOME	$ 179	$ 196