Retirement Benefits (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Mar. 31, 2014	Jun. 30, 2014	Jun. 30, 2013
Defined Benefit Plan Disclosure [Line Items]
Contributions to U.S. non qualified and non-U.S. Pension Plan		$ 106
Non-U.S. Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Effect of plan amendment on accumulated benefit obligation		147
Effect of plan amendment on funded status		137
Gain (loss) due to curtailments	65	65	0
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Gain (loss) due to curtailments		65	0
Expected contribution during remainder of 2013		$ 78
Equity Funds [Member] | United States Pension and Postretirement Benefit Plan of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation U.S. Plan, equities, prior period		58.00%
Actual asset allocation percentage of equity		60.00%
Fixed Income Funds [Member] | United States Pension and Postretirement Benefit Plan of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation U.S. Plan, equities, prior period		42.00%
Actual asset allocation percentage of equity		40.00%
United Kingdom [Member] | Equity Funds [Member] | Non-U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation U.S. Plan, equities, prior period		50.00%
Actual asset allocation percentage of equity		48.00%
United Kingdom [Member] | Fixed Income Funds [Member] | Non-U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation U.S. Plan, equities, prior period		50.00%
Actual asset allocation percentage of equity		52.00%
United Kingdom [Member] | Geographic Concentration Risk [Member] | Non-U.S. Plans [Member] | Non-U.S. Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Concentration risk percentage		82.00%