Postretirement Plans (Schedule Of Changes In The Benefit Obligation, Plan Assets And Funded Status Of Both Pensions And OPB) (Details) (USD $) In Millions, unless otherwise specified			12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Pension Plans [Member]	Dec. 31, 2010 Pension Plans [Member]	Dec. 31, 2011 Other Postretirement Benefits Plans [Member]	Dec. 31, 2010 Other Postretirement Benefits Plans [Member]	Sep. 30, 2011 Increase Due To Adjustment [Member] Other Postretirement Benefits Plans [Member]	Dec. 31, 2010 Increase Due To Adjustment [Member] Other Postretirement Benefits Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning balance			$ 59,106	$ 52,166	$ 8,546	$ 7,576	$ 294	$ 274
Service cost			1,406	1,176	221	121
Interest cost			3,116	3,002	484	404
Plan participants' contributions			9	9
Amendments			186	142	(719)	(130)
Actuarial (gain)/loss			6,586	5,243	(63)	1,061
Settlement/curtailment/acquisitions/ dispositions, net			(104)	(93)	3	32
Benefits paid			(2,644)	(2,567)	(503)	(555)
Medicare Part D subsidy					31	31
Exchange rate adjustment			(10)	28	(3)	6
Ending balance			67,651	59,106	7,997	8,546	294	274
Beginning balance at fair value	50,614	48,886	49,252	45,810	98	89
Actual return on plan assets			3,953	5,979	4	11
Company contribution			531	35	17	15
Plan participants' contributions			9	9	3	2
Settlement/curtailment/acquisitions/ dispositions, net			(104)	(98)
Benefits paid			(2,581)	(2,507)	(20)	(19)
Exchange rate adjustment			(9)	24
Ending balance at fair value	50,614	48,886	51,051	49,252	102	98
Pension plan assets, net			1	6
Other accrued liabilities			(64)	(60)	(375)	(423)
Accrued retiree health care					(7,520)	(8,025)
Accrued pension plan liability, net	(16,537)	(9,800)	(16,537)	(9,800)
Net amount recognized			$ (16,600)	$ (9,854)	$ (7,895)	$ (8,448)