Retirement Benefits (Status Of The Company Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
U.S. Pension Benefit Plans
Change in Benefit Obligation [Roll Forward]
Benefit obligation at January 1	$ 4,536	$ 7,317
Service cost	0	0	$ 0
Interest cost	193	370	352
Plan amendments	0	0
Settlements/curtailments	0	(4,227)
Actuarial loss (gain)	(319)	1,357
Foreign exchange valuation adjustment	0	0
Employee contributions	0	0
Benefit payments	(106)	(281)
Benefit obligation at December 31	4,304	4,536	7,317
Change in Plan Assets [Roll Forward]
Fair value at January 1	3,317	6,071
Return on plan assets	(84)	642
Company contributions	3	1,112
Settlements	0	(3,196)
Employee contributions	0	0
Foreign exchange valuation adjustment	0	0
Lump sum settlements	0	(1,031)
Benefit payments	(106)	(281)
Fair value at December 31	3,130	3,317	6,071
Funded status of the plan	(1,174)	(1,219)
Unrecognized net loss	1,777	1,846
Unrecognized prior service benefit	0	0
Prepaid (accrued) pension cost	603	627
Components of prepaid (accrued) pension cost:
Non-current benefit liability	(1,174)	(1,219)
Deferred income taxes	657	701
Accumulated other comprehensive loss	1,120	1,145
Non U.S. Pension Benefit Plans
Change in Benefit Obligation [Roll Forward]
Benefit obligation at January 1	2,075	1,904
Service cost	12	15	11
Interest cost	66	80	69
Plan amendments	1	0
Settlements/curtailments	(5)	0
Actuarial loss (gain)	(151)	263
Foreign exchange valuation adjustment	(123)	(146)
Employee contributions	2	2
Benefit payments	(62)	(43)
Benefit obligation at December 31	1,815	2,075	1,904
Change in Plan Assets [Roll Forward]
Fair value at January 1	1,806	1,513
Return on plan assets	33	191
Company contributions	10	237
Settlements	0	0
Employee contributions	2	2
Foreign exchange valuation adjustment	(93)	(96)
Lump sum settlements	0	0
Benefit payments	(62)	(41)
Fair value at December 31	1,696	1,806	1,513
Funded status of the plan	(119)	(269)
Unrecognized net loss	453	593
Unrecognized prior service benefit	0	(35)
Prepaid (accrued) pension cost	334	289
Components of prepaid (accrued) pension cost:
Non-current benefit liability	(119)	(269)
Deferred income taxes	46	51
Accumulated other comprehensive loss	407	507
Postretirement Health Care Benefits Plan
Change in Benefit Obligation [Roll Forward]
Benefit obligation at January 1	212	278
Service cost	1	2	2
Interest cost	8	10	11
Plan amendments	0	(41)
Settlements/curtailments	0	0
Actuarial loss (gain)	(12)	(14)
Foreign exchange valuation adjustment	0	0
Employee contributions	0	0
Benefit payments	(17)	(23)
Benefit obligation at December 31	192	212	278
Change in Plan Assets [Roll Forward]
Fair value at January 1	163	161
Return on plan assets	(6)	21
Company contributions	0	0
Settlements	0	0
Employee contributions	0	0
Foreign exchange valuation adjustment	0	0
Lump sum settlements	0	0
Benefit payments	(14)	(19)
Fair value at December 31	143	163	$ 161
Funded status of the plan	(49)	(49)
Unrecognized net loss	104	109
Unrecognized prior service benefit	(24)	(83)
Prepaid (accrued) pension cost	31	(23)
Components of prepaid (accrued) pension cost:
Non-current benefit liability	(49)	(49)
Deferred income taxes	31	10
Accumulated other comprehensive loss	$ 49	$ 16