Retirement Plans (Schedule Of Net Funded Status) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Curtailments		$ (7)
U.S. Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, January 1	$ 14,741	12,903
Service cost	161	145	$ 188
Interest cost	597	600	576
Curtailments	0	0
Settlements	(43)	0
Actuarial (gain) loss	(254)	1,755
Defined Benefit Plan, Divestitures, Benefit Obligation	0	(23)
Other	0	0
Plan amendments	0	133
Benefits paid	(764)	(772)
Effect of foreign currency exchange rate movements	0	0
Benefit obligation, December 31	14,438	14,741	12,903
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	10,918	10,706
Actual return on plan assets	(1)	593
Company contributions	813	391
Benefits paid	(764)	(772)
Settlements	(43)	0
Other	0	0
Effect of foreign currency exchange rate movements	0	0
Fair value of plan assets, December 31	10,923	10,918	10,706
Funded status, December 31	(3,515)	(3,823)
Non-U.S. Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, January 1	233	228
Service cost	6	5	4
Interest cost	10	13	11
Curtailments	0	(4)
Settlements	(12)	0
Actuarial (gain) loss	(1)	12
Defined Benefit Plan, Divestitures, Benefit Obligation	0	0
Other	0	12
Plan amendments	0	0
Benefits paid	(7)	(13)
Effect of foreign currency exchange rate movements	(25)	(20)
Benefit obligation, December 31	204	233	228
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	180	181
Actual return on plan assets	4	13
Company contributions	9	8
Benefits paid	(7)	(13)
Settlements	(12)	0
Other	0	6
Effect of foreign currency exchange rate movements	(19)	(15)
Fair value of plan assets, December 31	155	180	$ 181
Funded status, December 31	$ (49)	$ (53)