Pension, OPEB and Savings Plans (Changes In The Benefit Obligation And The Fair Value Of Plan Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010	Dec. 31, 2013
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Year	$ 4,610		$ 4,042
Pension Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	4,572		4,353
Service Cost	101		92		87
Interest Cost	223		228		231
Actuarial (Gain) Loss	586		300
Gross Benefits Paid	(248)		(236)
Medicare Subsidy Receipts	0		0
Plan Amendments	0		(165)
Special Termination Benefits	1		0
Benefit Obligation at End of Year	5,235		4,572		4,353
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Year	3,831		3,555
Actual Return on Plan Assets	541		87
Employer Contributions	233		425
Gross Benefits Paid	(248)		(236)
Medicare Subsidy Receipts	0		0
Fair Value of Assets at End of Year	4,357		3,831		3,555
Funded Status (Plan Assets less Benefit Obligation)	(878)		(741)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Noncurrent Assets	6		0
Current Accrued Benefit Cost	(8)		(7)
Noncurrent Accrued Benefit Cost	(876)		(734)
Amounts Recognized	(878)		(741)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Net Transition Obligation	0	[1]	0	[1]
Prior Service Cost	(139)	[1]	(158)	[1]
Net Actuarial Loss	2,174	[1]	1,991	[1]		188
Total	2,035	[1]	1,833	[1]
Accumulated Other Comprehensive Loss related to Pension and OPEB, before tax	827		745
Accumulated Other Comprehensive Loss related to Pension and OPEB, after tax	485		438
Other Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	1,338		1,162
Service Cost	17		14		16
Interest Cost	65		61		72
Actuarial (Gain) Loss	182		179
Gross Benefits Paid	(69)		(67)
Medicare Subsidy Receipts	5		6
Plan Amendments	0		(17)
Benefit Obligation at End of Year	1,538		1,338		1,162
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Year	211		195
Actual Return on Plan Assets	31		5
Employer Contributions	75		72
Gross Benefits Paid	(69)		(67)
Medicare Subsidy Receipts	5		6
Fair Value of Assets at End of Year	253		211		195
Funded Status (Plan Assets less Benefit Obligation)	(1,285)		(1,127)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Current Accrued Benefit Cost	0		0
Noncurrent Accrued Benefit Cost	(1,285)		(1,127)
Amounts Recognized	(1,285)		(1,127)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Net Transition Obligation	0	[1]	2	[1]
Prior Service Cost	(67)	[1]	(81)	[1]
Net Actuarial Loss	527	[1]	390	[1]		43
Total	$ 460	[1]	$ 311	[1]

[1] Includes $827 million ($485 million, after-tax) and $745 million ($438 million, after-tax) in Accumulated Other Comprehensive Loss related to Pension and OPEB as of December 31, 2012 and 2011, respectively.