Retirement Benefits (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2011
Target asset allocation U.S. Plan, equities, prior period	58.00%
Target asset allocation U.S. Plan, fixed income, prior period	42.00%
Target asset allocation non-U.S. Plan, equities	58.00%
Target asset allocation non-U.S. Plan, fixed income	42.00%
Target asset allocation percentage for non-U.S. Plan assets	82.00%
Contributions to U.S. non qualified and non-U.S. Pension Plan	$ 247
Expected fund in U.S. non pension plan	$ 70
U.S. Plans [Member]
Actual asset allocation percentage of equity	57.00%
Actual asset allocation percentage of fixed income	43.00%
U.K. Plan [Member]
Actual asset allocation percentage of equity	49.00%
Actual asset allocation percentage of fixed income	51.00%