Pension And Postretirement Benefits (Pension And Postretirement Benefit Costs Included In Operating Expenses) (Details) (USD $) In Millions	6 Months Ended
	Jun. 30, 2011
Defined Benefit Plan Disclosure [Line Items]
Net cost	$ 559
Pension (Benefit) Cost [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	593
Interest cost	1,479
Expected return on assets	(1,844)
Amortization of prior service benefit	(8)
Net cost	220
Postretirement (Benefit) Cost [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	181
Interest cost	1,025
Expected return on assets	(520)
Amortization of prior service benefit	(347)
Net cost	$ 339