Retirement Benefits (Status Of The Company Plans) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
U.S. Pension Benefit Plans
Change in Benefit Obligation [Roll Forward]
Benefit obligation at January 1	$ 7,317	$ 8,288
Service cost	0	0	0
Interest cost	370	352	349
Plan amendments	0	0
Settlements	(4,227)	0
Actuarial loss (gain)	1,357	(1,012)
Foreign exchange valuation adjustment	0	0
Employee contributions	0	0
Benefit payments	(281)	(311)
Benefit obligation at December 31	4,536	7,317	8,288
Change in Plan Assets [Roll Forward]
Fair value at January 1	6,071	5,426
Return on plan assets	642	806
Company contributions	1,112	150
Settlements	(3,196)	0
Employee contributions	0	0
Foreign exchange valuation adjustment	0	0
Lump sum settlements	(1,031)	0
Benefit payments	(281)	(311)
Fair value at December 31	3,317	6,071	5,426
Funded status of the plan	(1,219)	(1,246)
Unrecognized net loss	1,846	2,732
Unrecognized prior service benefit	0	0
Prepaid (accrued) pension cost	627	1,486
Components of prepaid (accrued) pension cost:
Non-current benefit liability	(1,219)	(1,246)
Deferred income taxes	701	1,002
Accumulated other comprehensive loss	1,145	1,730
Non U.S. Pension Benefit Plans
Change in Benefit Obligation [Roll Forward]
Benefit obligation at January 1	1,904	1,771
Service cost	15	11	10
Interest cost	80	69	73
Plan amendments	0	0
Settlements	0	0
Actuarial loss (gain)	263	91
Foreign exchange valuation adjustment	(146)	(1)
Employee contributions	2	2
Benefit payments	(43)	(39)
Benefit obligation at December 31	2,075	1,904	1,771
Change in Plan Assets [Roll Forward]
Fair value at January 1	1,513	1,343
Return on plan assets	191	182
Company contributions	237	32
Settlements	0	0
Employee contributions	2	2
Foreign exchange valuation adjustment	(96)	(8)
Lump sum settlements	0	0
Benefit payments	(41)	(38)
Fair value at December 31	1,806	1,513	1,343
Funded status of the plan	(269)	(391)
Unrecognized net loss	593	483
Unrecognized prior service benefit	(35)	(44)
Prepaid (accrued) pension cost	289	48
Components of prepaid (accrued) pension cost:
Non-current benefit liability	(269)	(391)
Deferred income taxes	51	28
Accumulated other comprehensive loss	507	411
Postretirement Health Care Benefits Plan
Change in Benefit Obligation [Roll Forward]
Benefit obligation at January 1	278	322
Service cost	2	2	3
Interest cost	10	11	16
Plan amendments	(41)	0
Settlements	0	0
Actuarial loss (gain)	(14)	(37)
Foreign exchange valuation adjustment	0	0
Employee contributions	0	0
Benefit payments	(23)	(20)
Benefit obligation at December 31	212	278	322
Change in Plan Assets [Roll Forward]
Fair value at January 1	161	155
Return on plan assets	21	22
Company contributions	0	0
Settlements	0	0
Employee contributions	0	0
Foreign exchange valuation adjustment	0	0
Lump sum settlements	0	0
Benefit payments	(19)	(16)
Fair value at December 31	163	161	155
Funded status of the plan	(49)	(117)
Unrecognized net loss	109	143
Unrecognized prior service benefit	(83)	(92)
Prepaid (accrued) pension cost	(23)	(66)
Components of prepaid (accrued) pension cost:
Non-current benefit liability	(49)	(117)
Deferred income taxes	10	19
Accumulated other comprehensive loss	$ 16	$ 32