Retirement Benefits (Expected Future Service Benefit Payments) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Regular Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
2012	$ 247
2013	261
2014	271
2015	286
2016	305
2017-2021	1,850
Officers' And MSPP [Member]
Defined Benefit Plan Disclosure [Line Items]
2012	2
2013	2
2014	2
2015	3
2016	3
2017-2021	18
Non-U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
2012	38
2013	39
2014	40
2015	42
2016	42
2017-2021	$ 232