Retirement Benefits (Summary of the U.S. and Non-U.S. Plan Investments Measured At Fair Value on a Recurring Basis) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Common/collective trusts	$ 4,847	$ 4,471
Corporate obligations	1,793	1,111
Corporate stocks	1,739	1,941
Private equity/Partnerships	780	747
Government securities	378	547
Real estate	337	301
Short-term investment funds	330	610
Company common stock	253	219
Other investments	237	188
Insurance group annuity contracts	20	20
Swaps	5	9
Total investments	10,719	10,164
Identical Assets (Level 1) [Member]
Common/collective trusts	10	0
Corporate obligations	0	0
Corporate stocks	1,716	1,939
Private equity/Partnerships	0	0
Government securities	10	0
Real estate	14	3
Short-term investment funds	288	561
Company common stock	253	219
Other investments	1	3
Insurance group annuity contracts	0	0
Swaps	0	0
Total investments	2,292	2,725
Observable Inputs (Level 2) [Member]
Common/collective trusts	4,837	4,471
Corporate obligations	1,792	1,103
Corporate stocks	15	1
Private equity/Partnerships	1	1
Government securities	368	547
Real estate	4	5
Short-term investment funds	42	49
Company common stock	0	0
Other investments	34	8
Insurance group annuity contracts	0	0
Swaps	5	9
Total investments	7,098	6,194
Unobservable Inputs (Level 3) [Member]
Common/collective trusts	0	0
Corporate obligations	1	8
Corporate stocks	8	1
Private equity/Partnerships	779	746
Government securities	0	0
Real estate	319	293
Short-term investment funds	0	0
Company common stock	0	0
Other investments	202	177
Insurance group annuity contracts	20	20
Swaps	0	0
Total investments	$ 1,329	$ 1,245