Retirement Benefits - Expense (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 130,000,000	$ 117,000,000	$ 260,000,000	$ 234,000,000
Interest cost	552,000,000	594,000,000	1,104,000,000	1,188,000,000
Expected return on assets	(718,000,000)	(757,000,000)	(1,436,000,000)	(1,514,000,000)
Defined Benefit Plan Amortization Categories [Abstract]
Prior service costs/(credits)	55,000,000	85,000,000	110,000,000	171,000,000
(Gains)/Losses	106,000,000	48,000,000	212,000,000	96,000,000
Separation programs/other	(2,000,000)		5,000,000	(1,000,000)
(Gains)/Losses from curtailment and settlements
Net expense/(income)	123,000,000	87,000,000	255,000,000	174,000,000
Pension Plan Contributions [Abstract]
Pension and Other Postretirement Benefit Contributions			1,000,000,000
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	1,000,000,000		1,000,000,000
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	93,000,000	84,000,000	186,000,000	164,000,000
Interest cost	298,000,000	314,000,000	596,000,000	617,000,000
Expected return on assets	(335,000,000)	(358,000,000)	(669,000,000)	(706,000,000)
Defined Benefit Plan Amortization Categories [Abstract]
Prior service costs/(credits)	18,000,000	18,000,000	36,000,000	36,000,000
(Gains)/Losses	103,000,000	77,000,000	206,000,000	153,000,000
Separation programs/other	11,000,000	48,000,000	45,000,000	60,000,000
(Gains)/Losses from curtailment and settlements	0	104,000,000	0	104,000,000
Net expense/(income)	188,000,000	287,000,000	400,000,000	428,000,000
Worldwide OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	17,000,000	16,000,000	34,000,000	31,000,000
Interest cost	72,000,000	83,000,000	144,000,000	165,000,000
Expected return on assets
Defined Benefit Plan Amortization Categories [Abstract]
Prior service costs/(credits)	(136,000,000)	(151,000,000)	(272,000,000)	(303,000,000)
(Gains)/Losses	32,000,000	28,000,000	64,000,000	57,000,000
Separation programs/other		1,000,000	1,000,000	1,000,000
(Gains)/Losses from curtailment and settlements			(10,000,000)
Net expense/(income)	(15,000,000)	(23,000,000)	(39,000,000)	(49,000,000)
Pension Plan Contributions [Abstract]
Pension and Other Postretirement Benefit Contributions			1,900,000,000
Pension and Other Postretirement Benefit Contributions Unfunded Plans			200,000,000
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	1,500,000,000		1,500,000,000
Pension And Other Postretirement Expected Benefit Contributions Unfunded Plans	200,000,000		200,000,000
Pension and Other Postretirement Benefit Contributions and Expected Future Employer Contributions To Funded and Unfunded Plans	$ 3,800,000,000		$ 3,800,000,000