Pension and Other Postretirement Benefits (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Pension Benefits - U.S. [Member]
Service cost	$ 124	$ 114	$ 249	$ 224
Interest cost	198	200	396	399
Expected return on plan assets	(193)	(182)	(385)	(363)
Amortization of actuarial loss/(gain) and prior service cost	124	133	247	264
Net pension enhancement and curtailment/settlement cost	101	126	202	253
Net benefit cost	354	391	709	777
Pension Benefits - Non-U.S. [Member]
Service cost	146	113	285	236
Interest cost	323	283	639	579
Expected return on plan assets	(296)	(242)	(586)	(494)
Amortization of actuarial loss/(gain) and prior service cost	193	160	377	325
Net pension enhancement and curtailment/settlement cost	0	0	0	1
Net benefit cost	366	314	715	647
Other Postretirement Benefits [Member]
Service cost	38	28	64	52
Interest cost	101	108	204	211
Expected return on plan assets	(12)	(11)	(22)	(20)
Amortization of actuarial loss/(gain) and prior service cost	49	46	106	108
Net benefit cost	$ 176	$ 171	$ 352	$ 351