Postretirement Plans (Schedule Of Changes In The Benefit Obligation, Plan Assets And Funded Status Of Both Pensions And OPB) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Accrued pension plan liability, net	$ (17,783)	$ (17,182)
Pension Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	78,391	68,625
Service cost	1,764	1,661	$ 1,886
Interest cost	2,990	3,058	2,906
Plan participants’ contributions	5	6
Amendments	(1,379)	51
Actuarial (gain)/loss	(3,505)	10,655
Settlement/curtailment/other	(457)	(2,518)
Gross benefits paid	(3,382)	(3,126)
Exchange rate adjustment	(39)	(21)
Ending balance	74,388	78,391	68,625
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance at fair value	61,119	58,131
Actual return/(loss) on plan assets	(701)	5,893
Company contribution	59	784
Plan participants’ contributions	5	6
Settlement payments	(649)	(640)
Benefits paid	(3,284)	(3,039)
Exchange rate adjustment	(35)	(16)
Ending balance at fair value	56,514	61,119	58,131
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Other assets	10	3
Other accrued liabilities	(101)	(93)
Accrued pension plan liability, net	(17,783)	(17,182)
Net amount recognized	(17,874)	(17,272)
Other Postretirement Benefits Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	7,306	7,008
Service cost	140	129	148
Interest cost	248	289	263
Plan participants’ contributions	5	2
Amendments	(19)	(43)
Actuarial (gain)/loss	(89)	334
Settlement/curtailment/other	10	7
Gross benefits paid	(486)	(449)
Subsidies	43	39
Exchange rate adjustment	(15)	(8)
Ending balance	7,138	7,306	7,008
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance at fair value	141	140
Actual return/(loss) on plan assets	1	10
Company contribution	5	8
Plan participants’ contributions	$ 5	$ 2
Settlement payments
Benefits paid	$ (20)	$ (19)
Exchange rate adjustment
Ending balance at fair value	$ 132	$ 141	$ 140
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Other accrued liabilities	(390)	(363)
Accrued retiree health care	(6,616)	(6,802)
Net amount recognized	$ (7,006)	$ (7,165)