Retirement Benefits (Summary of changes in the fair value of the plans’ Level 3 assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Asset Value, Beginning	$ 1,430	$ 1,329
Purchases	247	275
Sales	(282)	(263)
Unrealized Gain/(Loss)	(144)	254
Realized Gain/(Loss)	176	(194)
Exchange Rate Impact	(3)	29
Transfers in/(out) and Other	83	0
Fair Value, Asset Value, Ending	1,507	1,430
Private equity/partnerships [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Asset Value, Beginning	824	779
Purchases	146	86
Sales	(174)	(79)
Unrealized Gain/(Loss)	(155)	138
Realized Gain/(Loss)	150	(113)
Exchange Rate Impact	(1)	13
Transfers in/(out) and Other	9	0
Fair Value, Asset Value, Ending	799	824
Real Estate [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Asset Value, Beginning	357	319
Purchases	21	11
Sales	(95)	(3)
Unrealized Gain/(Loss)	6	104
Realized Gain/(Loss)	26	(86)
Exchange Rate Impact	(3)	12
Transfers in/(out) and Other	0	0
Fair Value, Asset Value, Ending	312	357
Other Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Asset Value, Beginning	216	202
Purchases	18	17
Sales	(13)	(24)
Unrealized Gain/(Loss)	11	11
Realized Gain/(Loss)	0	6
Exchange Rate Impact	6	4
Transfers in/(out) and Other	0	0
Fair Value, Asset Value, Ending	238	216
Common/Collective trusts [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Asset Value, Beginning	0
Purchases	61
Sales	0
Unrealized Gain/(Loss)	(4)
Realized Gain/(Loss)	0
Exchange Rate Impact	(5)
Transfers in/(out) and Other	99
Fair Value, Asset Value, Ending	151
Insurance Group Annuity Contracts [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Asset Value, Beginning	23	20
Purchases	0	160
Sales	0	(157)
Unrealized Gain/(Loss)	(1)	1
Realized Gain/(Loss)	0	(1)
Exchange Rate Impact	0	0
Transfers in/(out) and Other	(22)	0
Fair Value, Asset Value, Ending	0	23
Corporate stocks [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Asset Value, Beginning	9	8
Purchases	0	1
Sales	0	0
Unrealized Gain/(Loss)	0	0
Realized Gain/(Loss)	0	0
Exchange Rate Impact	0	0
Transfers in/(out) and Other	(8)	0
Fair Value, Asset Value, Ending	1	9
Corporate Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Asset Value, Beginning	1	1
Purchases	1	0
Sales	0	0
Unrealized Gain/(Loss)	0	0
Realized Gain/(Loss)	0	0
Exchange Rate Impact	0	0
Transfers in/(out) and Other	2	0
Fair Value, Asset Value, Ending	4	1
Government Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Asset Value, Beginning	0
Purchases	0
Sales	0
Unrealized Gain/(Loss)	(1)
Realized Gain/(Loss)	0
Exchange Rate Impact	0
Transfers in/(out) and Other	3
Fair Value, Asset Value, Ending	$ 2