Retirement Benefits (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
Defined Benefit Plan Disclosure [Line Items]
Contributions to U.S. non qualified and non-U.S. Pension Plan		$ 473
Expected fund in U.S. non pension plan	175	175
U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation U.S. Plan, equities, prior period	42.00%
Actual asset allocation percentage of equity		60.00%
Actual asset allocation percentage of fixed income		40.00%
Non-U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation percentage for non-U.S. Plan assets		82.00%
U.K. Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation percentage of equity		53.00%
Target asset allocation non-U.S. Plan, equities	53.00%	53.00%
Target asset allocation non-U.S. Plan, fixed income	47.00%	47.00%
Actual asset allocation percentage of fixed income		47.00%
Contributions to U.S. non qualified and non-U.S. Pension Plan		250
Canadian Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions to U.S. non qualified and non-U.S. Pension Plan		$ 70
Equity Funds [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation U.S. Plan, equities, prior period	58.00%