Condensed Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Unrealized Gains (Losses) on Available-for-Sale Securities, tax	$ (16)	$ 5	$ (27)	$ (16)
Unrealized Gains (Losses) on Cash Flow Hedges, tax	1	8	4	14
Pension/OPEB adjustment, tax	(6)	(5)	(20)	(16)
Power [Member]
Unrealized Gains (Losses) on Available-for-Sale Securities, tax	(18)	6	(29)	(16)
Unrealized Gains (Losses) on Cash Flow Hedges, tax	1	8	4	14
Pension/OPEB adjustment, tax	(6)	(4)	(17)	(14)
PSE And G [Member]
Unrealized Gains (Losses) on Available-for-Sale Securities, tax	$ 0	$ (1)	$ 1	$ 0