Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Abstract]
Total AOCI ending balance at June 30	$ (5,976)		$ (5,976)		$ (6,257)
Derivative instruments [Abstract]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	465
Parent Company [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Total AOCI ending balance at June 30	(5,976)	$ (5,496)	(5,976)	$ (5,496)
Foreign currency transaction [Abstract]
Beginning balance	(3,633)	(2,335)	(3,570)	(2,438)
Gains/(Losses) on foreign currency translation	(58)	(36)	(88)	67
Less: Tax/(Tax benefit)	0	0	0	0
Net gains/(losses) on foreign currency translation	(58)	(36)	(88)	67
(Gains)/Losses reclassified from AOCI to income	0	0	(33)	0
Other comprehensive income/(loss), net of tax	(58)	(36)	(121)	67
Ending balance	(3,691)	(2,371)	(3,691)	(2,371)
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	310	(253)	64	(163)
Gains/(Losses) on available for sale securities	184	(217)	547	(367)
Less: Tax/(Tax benefit)	35	(78)	94	(110)
Net gains/(losses) on available for sale securities	149	(139)	453	(257)
(Gains)/Losses reclassified from AOCI to net income	(46)	90	(133)	136
Less: Tax/(Tax benefit)	(8)	27	(37)	45
Net (gains)/losses reclassified from AOCI to net income	(38)	63	(96)	91
Other comprehensive income/(loss), net of tax	111	(76)	357	(166)
Ending balance	421	(329)	421	(329)
Pension and other postretirement benefits
Beginning balance	(2,723)	(2,812)	(2,745)	(2,664)
Amortization of prior service costs/(credits)	16	(2)	33	(2)
Less: Tax/(Tax benefit)	7	(2)	10	77
Net prior service costs/(credits) reclassified from AOCI to net income	9	0	23	(79)
Translation impact on non-U.S. plans	8	16	16	(53)
Other comprehensive income/(loss), net of tax	17	16	39	(132)
Ending balance	$ (2,706)	$ (2,796)	$ (2,706)	$ (2,796)