Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Foreign currency transaction
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	$ 328		$ 317	$ (308)	$ 82
Derivative instruments
Other comprehensive income/(loss), Derivative Instruments, net of tax	(76)		(287)	(166)	(195)
Pension and other postretirement benefits
Other comprehensive income/(loss), Pension and other post retirement benefits, net of tax	(107)		53	245	236
Total AOCI ending balance	(20,260)			(20,260)		$ (20,032)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest [Abstract]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Noncontrolling Interest	(1)
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	(311)
Parent Company [Member]
Foreign currency transaction
Beginning balance	(2,984)	$ (2,348)	(1,981)	(2,348)	(1,746)
Gains/(Losses) on foreign currency translation	329		298	(307)	116
Less: Net gain/(loss) on foreign currency translation, tax (tax benefit)	0		0	0	53
Net gain/(loss) on foreign currency translation	329		298	(307)	63
Gains/(Losses) reclassified from AOCI to income	0		19	0	19
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	329		317	(307)	82
Ending balance	(2,655)	(2,984)	(1,664)	(2,655)	(1,664)
Derivative instruments
Beginning balance	(232)	(142)	132	(142)	40
Gains/(Losses) on Derivative Instruments, Net, Pretax	(217)		(338)	(367)	(208)
Less: Net gains/(losses) on derivative instruments, tax (tax benefit)	(78)		(42)	(110)	(90)
Net gains/(losses) on derivative instruments	(139)		(296)	(257)	(118)
Gains/(Losses) reclassified from AOCI to net income	90		(92)	136	(160)
Less: Gains/(Losses) reclassified from AOCI to net income, tax (tax benefit)	27		(101)	45	(83)
Net gains/(losses) reclassified from AOCI to net income	63		9	91	(77)
Other comprehensive income/(loss), Derivative Instruments, net of tax	(76)		(287)	(166)	(195)
Ending balance	(308)	(232)	(155)	(308)	(155)
Pension and other postretirement benefits
Beginning balance	(17,190)	(17,542)	(16,341)	(17,542)	(16,524)
Gains/(Losses) arising during period, before Tax	0		0	(769)	(13)
Less: Gains/(Losses) arising during period, tax (tax benefit)	0		(2)	(269)	(5)
Net gain/(loss) arising during the period	0		2	(500)	(8)
Amortization of prior service costs/(credits)	(2)		(5)	(2)	(9)
Amortization of (gains)/losses	350		225	707	448
Recognition of (gains)/losses due to curtailments	0		0	0	0
Recognition of (gains)/losses due to settlements	0		0	0	14
Less: Reclassification adjustment from AOCI,Tax (Tax Benefits)	105		66	276	133
Net amortization and (gains)/losses reclassified from AOCI to net income	243		154	429	320
Translation impact on non-U.S. plans	(350)		(103)	316	(76)
Other comprehensive income/(loss), Pension and other post retirement benefits, net of tax	(107)		53	245	236
Ending balance	(17,297)	$ (17,190)	(16,288)	(17,297)	(16,288)
Total AOCI ending balance	$ (20,260)		$ (18,107)	$ (20,260)	$ (18,107)