Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Foreign currency transaction
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	$ (1,036)	$ (550)	$ (1,344)	$ (468)
Derivative instruments
Other comprehensive income/(loss), Derivative Instruments, net of tax	374	(48)	208	(243)
Pension and other postretirement benefits
Other comprehensive income/(loss), Pension and other post retirement benefits, net of tax	481	540	726	776
Total AOCI ending balance	(20,442)		(20,442)		$ (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	73
Parent Company [Member]
Foreign currency transaction
Beginning balance	(2,655)	(1,664)	(2,348)	(1,746)
Gains/(Losses) on foreign currency translation	(1,037)	(550)	(1,344)	(434)
Less: Net gain/(loss) on foreign currency translation, tax (tax benefit)	0	0	0	53
Net gain/(loss) on foreign currency translation	(1,037)	(550)	(1,344)	(487)
Gains/(Losses) reclassified from AOCI to income	0	0	0	19
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(1,037)	(550)	(1,344)	(468)
Ending balance	(3,692)	(2,214)	(3,692)	(2,214)
Derivative instruments
Beginning balance	(308)	(155)	(142)	40
Gains/(Losses) on Derivative Instruments, Net, Pretax	453	(128)	86	(336)
Less: Net gains/(losses) on derivative instruments, tax (tax benefit)	196	(35)	86	(125)
Net gains/(losses) on derivative instruments	257	(93)	0	(211)
Gains/(Losses) reclassified from AOCI to net income	60	61	196	(99)
Less: Gains/(Losses) reclassified from AOCI to net income, tax (tax benefit)	(57)	16	(12)	(67)
Net gains/(losses) reclassified from AOCI to net income	117	45	208	(32)
Other comprehensive income/(loss), Derivative Instruments, net of tax	374	(48)	208	(243)
Ending balance	66	(203)	66	(203)
Pension and other postretirement benefits
Beginning balance	(17,297)	(16,288)	(17,542)	(16,524)
Gains/(Losses) arising during period, before Tax	4	0	(765)	(13)
Less: Gains/(Losses) arising during period, tax (tax benefit)	0	0	(269)	(5)
Net gain/(loss) arising during the period	4	0	(496)	(8)
Amortization of prior service costs/(credits)	0	(5)	(2)	(14)
Amortization of (gains)/losses	352	225	1,059	673
Recognition of (gains)/losses due to curtailments	0	0	0	0
Recognition of (gains)/losses due to settlements	9	0	9	14
Less: Reclassification adjustment from AOCI,Tax (Tax Benefits)	86	52	362	185
Net amortization and (gains)/losses reclassified from AOCI to net income	275	168	704	488
Translation impact on non-U.S. plans	202	372	518	296
Other comprehensive income/(loss), Pension and other post retirement benefits, net of tax	481	540	726	776
Ending balance	(16,816)	(15,748)	(16,816)	(15,748)
Total AOCI ending balance	$ (20,442)	$ (18,165)	$ (20,442)	$ (18,165)