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
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net Actuarial (Gain) Loss in Current Period	$ (1,009)	$ 350
Amortization of Net Actuarial Gain (Loss)	(188)	(167)
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax	19	19
Amortization of Prior Service Credit	19
Amortization of Transition Asset	0	0
Total	(1,178)	202
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net Actuarial (Gain) Loss in Current Period	(175)	169
Amortization of Net Actuarial Gain (Loss)	(42)	(32)
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax	14	14
Amortization of Prior Service Credit	14
Amortization of Transition Asset	0	2
Total	$ (203)	$ 149