Retirement Benefits (Components of the Net Periodic Benefit Cost) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 252	$ 240	$ 226
Interest cost	581	596	609
Expected return on plan assets	(911)	(905)	(887)
Amortization of prior service credit	(22)	(19)	(19)
Recognized actuarial loss (credit)	315	270	215
Net periodic benefit cost	215	182	144
U.S. Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	104	93	83
Interest cost	229	230	231
Expected return on plan assets	(324)	(322)	(315)
Amortization of prior service credit	(16)	(16)	(16)
Recognized actuarial loss (credit)	207	152	100
Net periodic benefit cost	200	137	83
Non- U.S Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	148	147	143
Interest cost	352	366	378
Expected return on plan assets	(587)	(583)	(572)
Amortization of prior service credit	(6)	(3)	(3)
Recognized actuarial loss (credit)	108	118	115
Net periodic benefit cost	15	45	61
Settlement loss	0	1	0
Curtailment credit	0	(1)	0
Special termination benefits	0	0	0
Total cost	15	45	61
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	5	5
Interest cost	11	13	13
Expected return on plan assets
Amortization of prior service credit		(14)	(13)
Recognized actuarial loss (credit)	2		(4)
Net periodic benefit cost	18	4	1
U.S. Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3	3
Interest cost	7	8	8
Expected return on plan assets
Amortization of prior service credit		(13)	(13)
Recognized actuarial loss (credit)		(1)	(4)
Net periodic benefit cost	10	(3)	(6)
Foreign Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	2	2
Interest cost	4	5	5
Expected return on plan assets
Amortization of prior service credit		(1)
Recognized actuarial loss (credit)	2	1
Net periodic benefit cost	8	7	7
Settlement loss	0	0	0
Curtailment credit	0	0	0
Special termination benefits	0	0	0
Total cost	$ 8	$ 7	$ 7