Postretirement Plans (Schedule Of Amounts Recognized In Other Comprehensive Loss Related To Postretirement Benefit Plans) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Amounts Recognized In Other Comprehensive Loss Related To Postretirement Benefit Plans [Line Items]
Actuarial gains and (losses) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost	$ (2,848)	$ (921)	$ 265
Prior service credit and (cost) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost	(10)	(62)	(51)
Total Incurred but Not Recognized	(2,858)	(983)	214
Actuarial (gains) and losses - Recognition of Previously Deferred Amounts	624	501	244
Prior service (credit) and cost - Recognition of Previously Deferred Amounts	42	52	37
Total Reclassification Adjustment for Prior Period Amounts Recognized	666	553	281
Actuarial (gains) and losses - Expected to be Recognized in Net Periodic Benefit Cost in 2012	773
Prior service (credit) and cost - Expected to be Recognized in Net Periodic Benefit Cost in 2012	(39)
Total Expected to be Recognized in Net Periodic Benefit Cost in 2012	(812)
Qualified Defined Benefit Pension Plans [Member]
Amounts Recognized In Other Comprehensive Loss Related To Postretirement Benefit Plans [Line Items]
Actuarial gains and (losses) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost	(2,793)	(763)	298
Prior service credit and (cost) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost	(3)	(61)	(45)
Actuarial (gains) and losses - Recognition of Previously Deferred Amounts	568	464	195
Prior service (credit) and cost - Recognition of Previously Deferred Amounts	53	62	52
Actuarial (gains) and losses - Expected to be Recognized in Net Periodic Benefit Cost in 2012	721
Prior service (credit) and cost - Expected to be Recognized in Net Periodic Benefit Cost in 2012	(47)
Retiree Medical And Life Insurance Plans [Member]
Amounts Recognized In Other Comprehensive Loss Related To Postretirement Benefit Plans [Line Items]
Actuarial gains and (losses) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost	1	(95)	77
Prior service credit and (cost) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost	(7)		(6)
Actuarial (gains) and losses - Recognition of Previously Deferred Amounts	22	17	27
Prior service (credit) and cost - Recognition of Previously Deferred Amounts	(11)	(10)	(15)
Actuarial (gains) and losses - Expected to be Recognized in Net Periodic Benefit Cost in 2012	21
Prior service (credit) and cost - Expected to be Recognized in Net Periodic Benefit Cost in 2012	8
Other Plan [Member]
Amounts Recognized In Other Comprehensive Loss Related To Postretirement Benefit Plans [Line Items]
Actuarial gains and (losses) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost	(56)	(63)	(110)
Prior service credit and (cost) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost		(1)
Actuarial (gains) and losses - Recognition of Previously Deferred Amounts	34	20	22
Prior service (credit) and cost - Recognition of Previously Deferred Amounts
Actuarial (gains) and losses - Expected to be Recognized in Net Periodic Benefit Cost in 2012	$ 31