Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Abstract]
Total AOCI ending balance at September 30	$ (6,046)		$ (6,046)		$ (6,257)
Derivative instruments [Abstract]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	548
Parent Company [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Total AOCI ending balance at September 30	(6,046)	$ (5,872)	(6,046)	$ (5,872)
Foreign currency transaction [Abstract]
Beginning balance	(3,691)	(2,371)	(3,570)	(2,438)
Gains/(Losses) on foreign currency translation	(183)	(883)	(271)	(816)
Less: Tax/(Tax benefit)	0	0	0	0
Net gains/(losses) on foreign currency translation	(183)	(883)	(271)	(816)
(Gains)/Losses reclassified from AOCI to income	0	0	(33)	0
Other comprehensive income/(loss), net of tax	(183)	(883)	(304)	(816)
Ending balance	(3,874)	(3,254)	(3,874)	(3,254)
Marketable securities [Abstract]
Beginning balance	0	0	(6)	0
Gains/(Losses) on available for sale securities	0	0	11	0
Less: Tax/(Tax benefit)	0	0	0	0
Net gains/(losses) on available for sale securities	0	0	11	0
(Gains)/Losses reclassified from AOCI to net income	0	0	(1)	0
Less: Tax/(Tax benefit)	0	0	4	0
Net (gains)/losses reclassified from AOCI to net income	0	0	(5)	0
Other comprehensive income/(loss), net of tax	0	0	6	0
Ending balance	0	0	0	0
Derivative instruments [Abstract]
Beginning balance	421	(329)	64	(163)
Gains/(Losses) on available for sale securities	340	453	887	86
Less: Tax/(Tax benefit)	87	196	181	86
Net gains/(losses) on available for sale securities	253	257	706	0
(Gains)/Losses reclassified from AOCI to net income	(202)	60	(335)	196
Less: Tax/(Tax benefit)	(48)	(57)	(85)	(12)
Net (gains)/losses reclassified from AOCI to net income	(154)	117	(250)	208
Other comprehensive income/(loss), net of tax	99	374	456	208
Ending balance	520	45	520	45
Pension and other postretirement benefits
Beginning balance	(2,706)	(2,796)	(2,745)	(2,664)
Amortization of prior service costs/(credits)	17	0	50	(2)
Less: Tax/(Tax benefit)	7	(86)	17	(9)
Net prior service costs/(credits) reclassified from AOCI to net income	10	86	33	7
Translation impact on non-U.S. plans	4	47	20	(6)
Other comprehensive income/(loss), net of tax	14	133	53	1
Ending balance	$ (2,692)	$ (2,663)	$ (2,692)	$ (2,663)