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, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Accrued pension plan liability, net	$ (17,182)	$ (10,474)
Pension Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	68,625	75,895
Service cost	1,661	1,886	1,649
Interest cost	3,058	2,906	3,005
Plan participants’ contributions	6	8
Amendments	51	111
Actuarial (gain)/loss	10,655	(9,205)
Settlement/curtailment/other	(2,518)	(81)
Gross benefits paid	(3,126)	(2,874)
Exchange rate adjustment	(21)	(21)
Ending balance	78,391	68,625	75,895
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance at fair value	58,131	56,178
Actual return on plan assets	5,893	3,316
Company contribution	784	1,542
Plan participants’ contributions	6	8
Settlement/curtailment/other	(640)	(103)
Benefits paid	(3,039)	(2,792)
Exchange rate adjustment	(16)	(18)
Ending balance at fair value	61,119	58,131	56,178
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Other assets	3	60
Other accrued liabilities	(93)	(80)
Accrued pension plan liability, net	(17,182)	(10,474)
Net amount recognized	(17,272)	(10,494)
Other Postretirement Benefits Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	7,008	7,981
Service cost	129	148	146
Interest cost	289	263	313
Plan participants’ contributions	2	3
Amendments	(43)	4
Actuarial (gain)/loss	334	(905)
Settlement/curtailment/other	7	(57)
Gross benefits paid	(449)	(451)
Subsidies	39	32
Exchange rate adjustment	(8)	(7)
Ending balance	7,306	7,008	7,981
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance at fair value	140	110
Actual return on plan assets	10	23
Company contribution	8	14
Plan participants’ contributions	2	3
Settlement/curtailment/other		11
Benefits paid	(19)	(21)
Exchange rate adjustment
Ending balance at fair value	141	140	110
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Other accrued liabilities	(363)	(340)
Accrued retiree health care	(6,802)	(6,528)
Net amount recognized	$ (7,165)	$ (6,868)