Condensed Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Unrealized Gains (Losses) on Available-for-Sale Securities, tax	$ (15)	$ (24)	$ (40)	$ (50)
Unrealized Gains (Losses) on Cash Flow Hedges, tax	0	0	0	(1)
Pension/OPEB adjustment, tax	(4)	(5)	(12)	(17)
PSE And G [Member]
Unrealized Gains (Losses) on Available-for-Sale Securities, tax	0	0	1	0
Power [Member]
Unrealized Gains (Losses) on Available-for-Sale Securities, tax	(14)	(23)	(41)	(48)
Pension/OPEB adjustment, tax	$ (4)	$ (5)	$ (11)	$ (15)