Retirement Benefits (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended				3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013 U.K. Pension Plan [Member]	Sep. 30, 2013 Canadian Pension Plan [Member]	Sep. 30, 2013 Pension Benefits [Member]	Sep. 30, 2013 Equity Funds [Member] U.S. Plans [Member]	Sep. 30, 2013 Equity Funds [Member] U.K. Plan [Member]	Sep. 30, 2013 Fixed Income Funds [Member] U.S. Plans [Member]	Sep. 30, 2013 Fixed Income Funds [Member] U.K. Plan [Member]	Sep. 30, 2013 Non-U.S. Plans [Member] U.K. Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation U.S. Plan, equities, prior period					58.00%	53.00%	42.00%	47.00%
Actual asset allocation percentage of equity					62.00%	50.00%	38.00%	50.00%
Concentration Risk, Percentage									83.00%
Contributions to U.S. non qualified and non-U.S. Pension Plan	$ 552	$ 250	$ 70
Expected contribution during remainder of 2013				$ 102