Derivative Financial Instruments and Risk Management (Details 5) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Designated derivatives | Fair value hedges | Interest rate contracts | Other income (expense)
Derivative Instruments, Gain (Loss)
Gains (Losses) on Derivatives	$ 3	$ (19)	$ (11)	$ (38)
Gains (Losses) on Borrowings	(3)	18	10	37
Designated derivatives | Cash flow hedges | Interest rate contracts
Derivative Instruments, Gain (Loss)
Amount of Gains (Losses) Reclassified from AOCI to Earnings (Effective Portion)	(1)	(2)	(4)	(4)
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)	(1)	(2)	(4)	(4)
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	6	(19)	(18)	(36)
Undesignated derivatives | Foreign exchange contracts | Other income (expense)
Derivative Instruments, Gain (Loss)
Gains (Losses) on Derivatives Not Designated as Hedging Instruments	(2)	(25)	(34)	(35)
Undesignated derivatives | Cross currency contracts | Other income (expense)
Derivative Instruments, Gain (Loss)
Gains (Losses) on Derivatives Not Designated as Hedging Instruments	$ 8	$ 6	$ 16	$ (1)