Pension, OPEB and Savings Plans (Pre-Tax Changes Recognized In Accumulated Other Comprehensive Income (Loss), Regulatory Assets And Deferred Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net Actuarial (Gain) Loss in Current Period		$ 350	$ 547
Amortization of Net Actuarial Gain (Loss)		(167)	(119)
Prior Service Credit in Current Period		0	(165)
Amortization of Prior Service Credit	19	19	11
Amortization of Transition Asset		0	0
Total		202	274
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net Actuarial (Gain) Loss in Current Period		169	192
Amortization of Net Actuarial Gain (Loss)		(32)	(14)
Prior Service Credit in Current Period		0	(17)
Amortization of Prior Service Credit	14	14	13
Amortization of Transition Asset		(2)	(4)
Total		$ 149	$ 170