Retirement Benefits (Components of the Net Periodic Benefit Cost) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Pension Plans, Defined Benefit [Member]
Service cost	$ 226	$ 197	$ 188
Interest cost	609	578	551
Expected return on plan assets	(887)	(815)	(788)
Amortization of prior service credit	(19)	(21)	(49)
Recognized actuarial loss (credit)	215	144	70
Net periodic benefit cost (credit)	144	83	(28)
U.S. Pension Benefits [Member]
Service cost	83	76	76
Interest cost	231	227	219
Expected return on plan assets	(315)	(295)	(293)
Amortization of prior service credit	(16)	(18)	(47)
Recognized actuarial loss (credit)	100	71	52
Net periodic benefit cost (credit)	83	61	7
Non- U.S Pension Benefits [Member]
Service cost	143	121	112
Interest cost	378	351	332
Expected return on plan assets	(572)	(520)	(495)
Amortization of prior service credit	(3)	(3)	(2)
Recognized actuarial loss (credit)	115	73	18
Net periodic benefit cost (credit)	61	22	(35)
Settlement (credit)/loss	0	5	1
Curtailment (credit)/loss	0	0	0
Special termination benefits	0	1	0
Total cost (credit)	61	28	(34)
Postretirement Benefits [Member]
Service cost	5	4	5
Interest cost	13	14	17
Expected return on plan assets	0	0	0
Amortization of prior service credit	(13)	(13)	(13)
Recognized actuarial loss (credit)	(4)	0	1
Net periodic benefit cost (credit)	1	5	10
U.S. Postretirement Benefits [Member]
Service cost	3	3	4
Interest cost	8	10	12
Expected return on plan assets	0	0	0
Amortization of prior service credit	(13)	(13)	(13)
Recognized actuarial loss (credit)	(4)	0	1
Net periodic benefit cost (credit)	(6)	0	4
Non- U.S Postretirement Benefits [Member]
Service cost	2	1	1
Interest cost	5	4	5
Expected return on plan assets	0	0	0
Amortization of prior service credit	0	0	0
Recognized actuarial loss (credit)	0	0	0
Net periodic benefit cost (credit)	7	5	6
Settlement (credit)/loss	0	0	0
Curtailment (credit)/loss	0	0	0
Special termination benefits	0	0	0
Total cost (credit)	$ 7	$ 5	$ 6