Accumulated Other Comprehensive Income/(Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Foreign currency transaction
Other comprehensive income/(loss), net of tax	$ (778)	$ 248	$ (255)	$ 836
Derivative instruments
Other comprehensive income/(loss), net of tax	(89)	17	(152)	134
Pension and other postretirement benefits
Other comprehensive income/(loss), net of tax	253	183	213	105
Net holding gain/(loss)
Total AOCI ending balance	(18,928)		(18,928)		(18,734)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest [Abstract]
Foreign currency transaction losses attributable to noncontrolling interests				2
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax, Portion Attributable to Parent [Abstract]
Net gain/(loss) on foreign currency translation, tax			0	0
Reclassifications to net income, tax			0	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax, Portion Attributable to Parent [Abstract]
Net gain/(loss) on derivative instruments, tax			(118)	27
Reclassifications to net income, tax			51	(3)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax, Portion Attributable to Parent [Abstract]
Prior service cost arising during the period, tax			0	0
Net gain/(loss) arising during the period, tax			0	0
Amortization of prior service cost included in net income, tax			(54)	5
Amortization of gain/(loss) included in net income, tax			151	21
Translation Impact on non-U.S. plans, tax			0	0
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax, Portion Attributable to Parent [Abstract]
Reclassifications to net income, tax			0	0
Parent [Member]
Foreign currency transaction
Beginning balance			(1,383)	(665)
Net gain/(loss) on foreign currency translation			(255)	844
Reclassifications to net income			0	(6)
Other comprehensive income/(loss), net of tax			(255)	838
Ending balance	(1,638)	173	(1,638)	173
Derivative instruments
Beginning balance			(181)	(29)
Net gain/(loss) on derivative instruments			(251)	167
Reclassifications to net income			99	(33)
Other comprehensive income/(loss), net of tax			(152)	134
Ending balance	(333)	105	(333)	105
Pension and other postretirement benefits
Beginning balance			(17,170)	(13,617)
Prior service cost arising during the period			0	(45)
Net gain/(loss) arising during the period			0	0
Amortization of prior service cost included in net income			(82)	(101)
Amortization of (gain)/loss included in net income			331	389
Translation impact on non-U.S. plans			(36)	(138)
Other comprehensive income/(loss), net of tax			213	105
Ending balance	(16,957)	(13,512)	(16,957)	(13,512)
Net holding gain/(loss)
Beginning balance			0	(2)
Reclassifications to net income			0	0
Ending balance	0	(2)	0	(2)
Total AOCI ending balance	$ (18,928)	$ (13,236)	$ (18,928)	$ (13,236)