Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Abstract]
Total AOCI ending balance at March 31	$ (6,046)		$ (6,257)
Derivative instruments [Abstract]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	363
Parent Company [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Total AOCI ending balance at March 31	(6,046)	$ (5,400)
Foreign currency transaction [Abstract]
Beginning balance	(3,570)	(2,438)
Gains/(Losses) on foreign currency translation	(30)	103
Less: Tax/(Tax benefit)	0	0
Net gains/(losses) on foreign currency translation	(30)	103
(Gains)/Losses reclassified from AOCI to income	(33)	0
Other comprehensive income/(loss), net of tax	(63)	103
Ending balance	(3,633)	(2,335)
Marketable securities [Abstract]
Beginning balance	(6)	0
Gains/(Losses) on available for sale securities	11	0
Less: Tax/(Tax benefit)	0	0
Net gains/(losses) on available for sale securities	11	0
(Gains)/Losses reclassified from AOCI to net income	(1)	0
Less: Tax/(Tax benefit)	4	0
Net (gains)/losses reclassified from AOCI to net income	(5)	0
Other comprehensive income/(loss), net of tax	6	0
Ending balance	0	0
Derivative instruments [Abstract]
Beginning balance	64	(163)
Gains/(Losses) on available for sale securities	363	(150)
Less: Tax/(Tax benefit)	59	(32)
Net gains/(losses) on available for sale securities	304	(118)
(Gains)/Losses reclassified from AOCI to net income	(87)	46
Less: Tax/(Tax benefit)	(29)	18
Net (gains)/losses reclassified from AOCI to net income	(58)	28
Other comprehensive income/(loss), net of tax	246	(90)
Ending balance	310	(253)
Pension and other postretirement benefits
Beginning balance	(2,745)	(2,664)
Amortization of prior service costs/(credits)	17	0
Less: Tax/(Tax benefit)	3	79
Net prior service costs/(credits) reclassified from AOCI to net income	14	(79)
Translation impact on non-U.S. plans	8	(69)
Other comprehensive income/(loss), net of tax	22	(148)
Ending balance	$ (2,723)	$ (2,812)