Retirement Benefits (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended					12 Months Ended			9 Months Ended	12 Months Ended			1 Months Ended			3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2007	Dec. 31, 2006	Dec. 31, 2012 U.S. Plans	Dec. 31, 2011 U.S. Plans	Dec. 31, 2010 U.S. Plans	Dec. 31, 2011 Non-U.S. Plans	Dec. 31, 2012 Non-U.S. Plans	Dec. 31, 2011 Non-U.S. Plans	Dec. 31, 2010 Non-U.S. Plans	Jan. 31, 2011 Pension Benefit Guaranty Corporation [Member]	Dec. 31, 2012 Pension Benefit Plans	Dec. 31, 2011 Pension Benefit Plans	Sep. 29, 2012 Postretirement Health Care Benefits Plans	Dec. 31, 2012 Postretirement Health Care Benefits Plans	Dec. 31, 2011 Postretirement Health Care Benefits Plans	Dec. 31, 2010 Postretirement Health Care Benefits Plans	Dec. 31, 2012 Minimum [Member]	Dec. 31, 2011 Minimum [Member]	Dec. 31, 2012 Maximum	Dec. 31, 2010 Maximum	Dec. 31, 2012 2013 [Member]	Dec. 31, 2012 2012 [Member]	Dec. 31, 2011 2012 [Member]	Dec. 31, 2011 Through 2015 [Member]	Dec. 31, 2011 2019 [Member]
Defined Benefit Plan Disclosure [Line Items]
Additional eligible compensation after IRS limit						$ 175,000
Defined benefit Pension Plan vesting period		3 years			5 years
Accumulated other comprehensive loss	(3,300,000,000)	(3,300,000,000)	(2,876,000,000)				(131,000,000)				8,000,000
Unrecognized gains (losses) amortization periods range, in years																					3 years		13 years
Unrecognized gains (losses) expected amortization period																						5 years		28 years
Prior service costs amortization periods range, years																					10 years		12 years
U.S. pension plan freeze curtailment gain										9,000,000
Expected company contributions		340,000,000	489,000,000
Additional company contributions	250,000,000													100,000,000
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year							300,000,000				30,000,000
Retiree Health Reimbursement Account, Participant Minimum Age		65 years
Plan amendments - reduction in liability																	(139,000,000)	151,000,000	0
Decrease in accumulated other comprehensive loss																		(87,000,000)
Amortization period of prior service cost																		3 years
Amortization of net credit included in 2013 estimated periodic expense																		28,000,000
Non-cash tax charge to reduce deferred tax				18,000,000
Ultimate health care cost																									8.50%	5.00%	7.25%	7.25%	5.00%
Net periodic pension cost for split-dollar life insurance arrangements		5,000,000	5,000,000	5,000,000			188,000,000	151,000,000	119,000,000		26,000,000	11,000,000	38,000,000					3,000,000	20,000,000	18,000,000
Actuarial present value of the future death benefits															58,000,000	56,000,000		322,000,000	450,000,000	447,000,000
Employee contributions				4.00%
Expenses for material defined contribution plans		42,000,000	48,000,000	23,000,000
Discretionary matching contributions made during period		$ 0