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, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Accrued pension plan liability, net	$ (19,651)	$ (16,537)
Pension Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	67,651	59,106
Service cost	1,649	1,406	1,176
Interest cost	3,005	3,116	3,002
Plan participants' contributions	9	9
Amendments	13	186
Actuarial loss/(gain)	6,378	6,586
Settlement/curtailment/acquisitions/dispositions, net	(76)	(104)
Gross benefits paid	(2,744)	(2,644)
Exchange rate adjustment	10	(10)
Ending balance	75,895	67,651	59,106
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance at fair value	51,051	49,252
Actual return on plan assets	6,300	3,953
Company contribution	1,550	531
Plan participants' contributions	9	9
Defined Benefit Plan, Purchases, Sales, and Settlements	(71)	(104)
Benefits paid	(2,669)	(2,581)
Exchange rate adjustment	8	(9)
Ending balance at fair value	56,178	51,051	49,252
Pension plan assets, net	5	1
Other accrued liabilities	(71)	(64)
Accrued pension plan liability, net	(19,651)	(16,537)
Net amount recognized	(19,717)	(16,600)
Other Postretirement Benefits Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	7,997	8,546
Service cost	146	221	121
Interest cost	313	484	404
Plan participants' contributions	3	3
Amendments	12	(719)
Actuarial loss/(gain)	(53)	(63)
Settlement/curtailment/acquisitions/dispositions, net	(1)	3
Gross benefits paid	(474)	(503)
Medicare Part D subsidy	37	31
Exchange rate adjustment	4	(3)
Ending balance	7,981	7,997	8,546
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance at fair value	102	98
Actual return on plan assets	1	4
Company contribution	15	17
Plan participants' contributions	3	3
Defined Benefit Plan, Purchases, Sales, and Settlements	10
Benefits paid	(21)	(20)
Ending balance at fair value	110	102	98
Other accrued liabilities	(343)	(375)
Accrued retiree health care	(7,528)	(7,520)
Net amount recognized	$ (7,871)	$ (7,895)