Derivative Financial Instruments and Risk Management (Details 5) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Designated derivatives | Fair value hedges | Interest rate contracts | Other income (expense)
Derivative Instruments, Gain (Loss)
Gains (Losses) on Derivatives	$ (13)	$ (6)	$ (14)	$ (19)
Gains (Losses) on Borrowings	12	6	13	19
Designated derivatives | Cash flow hedges | Interest rate contracts
Derivative Instruments, Gain (Loss)
Amount of Gains (Losses) Reclassified from AOCI to Earnings (Effective Portion)	(2)	(1)	(3)	(2)
Recognized in Earnings (Ineffective Portion)	0	0	0	0
Designated derivatives | Cash flow hedges | Interest rate contracts | Interest expense
Derivative Instruments, Gain (Loss)
Amount of Gains (Losses) Reclassified from AOCI to Earnings (Effective Portion)	(2)	(1)	(3)	(2)
Recognized in Earnings (Ineffective Portion)	0	0	0	0
Designated derivatives | Cash flow hedges | Interest rate contracts | Other income (expense)
Derivative Instruments, Gain (Loss)
Amount of Gains (Losses) Reclassified from AOCI to Earnings (Effective Portion)	0	0	0	0
Recognized in Earnings (Ineffective Portion)	0	0	0	0
Undesignated derivatives
Derivative Instruments, Gain (Loss)
Gains (Losses) on Derivatives Not Designated as Hedging Instruments	4	(12)	(24)	(17)
Undesignated derivatives | Foreign exchange contracts | Other income (expense)
Derivative Instruments, Gain (Loss)
Gains (Losses) on Derivatives Not Designated as Hedging Instruments	6	(9)	(32)	(10)
Undesignated derivatives | Cross currency contracts | Other income (expense)
Derivative Instruments, Gain (Loss)
Gains (Losses) on Derivatives Not Designated as Hedging Instruments	$ (2)	$ (3)	$ 8	$ (7)