Income Taxes (Schedule Of Expiration Periods Of The Deferred Tax Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010
Tax Credit Carryforward [Line Items]
Tax loss carryforwards	$ 2,035
Tax credit carryforwards	477
Other	3,536
Valuation allowance	(1,398)
Deferred tax assets, net	4,650		5,065
Expires Within 10 Years [Member]
Tax Credit Carryforward [Line Items]
Tax loss carryforwards	340
Tax credit carryforwards	360
Valuation allowance	(231)
Deferred tax assets, net	469
Expires Within 11 To 20 Years [Member]
Tax Credit Carryforward [Line Items]
Tax loss carryforwards	815
Tax credit carryforwards	58
Valuation allowance	(643)
Deferred tax assets, net	230
No Expiration [Member]
Tax Credit Carryforward [Line Items]
Tax loss carryforwards	880	[1]
Tax credit carryforwards	59	[1]
Other	507	[1]
Valuation allowance	(213)	[1]
Deferred tax assets, net	1,233	[1]
Other Deferred Tax Assets [Member]
Tax Credit Carryforward [Line Items]
Other	3,029	[1]
Valuation allowance	(311)	[1]
Deferred tax assets, net	$ 2,718	[1]

[1] * Deferred tax assets with no expiration may still have annual limitations on utilization. Other represents deferred tax assets whose expiration is dependent upon the reversal of the underlying temporary difference. A substantial amount of Other relates to employee benefits that will become deductible for tax purposes over an extended period of time as contributions are made to employee benefit plans and payments are made to retirees.