Financial Instruments: (Details 5) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Derivative Instruments, Gain (Loss)
Amount of gain (loss) recognized in income on derivatives	$ 155	[1]	$ (218)	[1]	$ 224	[1]	$ (603)	[1]
Gain (loss) recognized in earnings attributable to risk being hedged	(83)	[2]	151	[2]	(121)	[2]	226	[2]
Gain (Loss) Recognized in Earnings and Other Comprehensive Income, Effective Portion Recognized in OCI	(67)		52		(4)		632
Gain (Loss) Recognized in Earnings and Other Comprehensive Income, Effective Portion Reclassified from AOCI to Earnings	(34)		47		(33)		103
Gain (Loss) Recognized in Earnings and Other Comprehensive Income, (Ineffectiveness) and Amounts Excluded from Effectiveness Testing	(1)	[3]	2	[3]	(2)	[3]	1	[3]
Derivative instruments in fair value hedging relationships
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Earnings and Other Comprehensive Income, (Ineffectiveness) and Amounts Excluded from Effectiveness Testing	0		0		0		0
Derivative instruments in cash flow hedging relationships
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Earnings and Other Comprehensive Income, (Ineffectiveness) and Amounts Excluded from Effectiveness Testing	0		0		0		0
Foreign exchange contracts | Derivative instruments in cash flow hedging relationships
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Earnings and Other Comprehensive Income, Effective Portion Recognized in OCI	(16)		(10)		72		350
Foreign exchange contracts | Derivative instruments in net investment hedging relationships
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Earnings and Other Comprehensive Income, Effective Portion Recognized in OCI	(51)	[4]	62	[4]	(76)	[4]	282	[4]
Cost of financing | Interest rate contracts | Derivative instruments in fair value hedging relationships
Derivative Instruments, Gain (Loss)
Amount of gain (loss) recognized in income, recognized on derivative instruments in fair value hedges	71	[1]	(68)	[1]	115	[1]	(88)	[1]
Gain (loss) recognized in earnings attributable to risk being hedged	(45)	[2]	92	[2]	(65)	[2]	138	[2]
Interest expense | Interest rate contracts | Derivative instruments in fair value hedging relationships
Derivative Instruments, Gain (Loss)
Amount of gain (loss) recognized in income, recognized on derivative instruments in fair value hedges	62	[1]	(44)	[1]	99	[1]	(56)	[1]
Gain (loss) recognized in earnings attributable to risk being hedged	(38)	[2]	59	[2]	(56)	[2]	88	[2]
Interest expense | Interest rate contracts | Derivative instruments in cash flow hedging relationships
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Earnings and Other Comprehensive Income, Effective Portion Reclassified from AOCI to Earnings	1
Interest expense | Foreign exchange contracts | Derivative instruments in net investment hedging relationships
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Earnings and Other Comprehensive Income, (Ineffectiveness) and Amounts Excluded from Effectiveness Testing	(1)	[3],[4]	3	[3],[4]	(1)	[3],[4]	2	[3],[4]
Other (income) and expense | Interest rate contracts | Derivative instruments not designated as hedging instruments
Derivative Instruments, Gain (Loss)
Amount of gain (loss) recognized in income on derivatives	41	[1]			40	[1]
Other (income) and expense | Foreign exchange contracts | Derivative instruments in cash flow hedging relationships
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Earnings and Other Comprehensive Income, Effective Portion Reclassified from AOCI to Earnings	(5)		48		24		85
Gain (Loss) Recognized in Earnings and Other Comprehensive Income, (Ineffectiveness) and Amounts Excluded from Effectiveness Testing	0	[3]	(1)	[3]	(1)	[3]	(1)	[3]
Other (income) and expense | Foreign exchange contracts | Derivative instruments not designated as hedging instruments
Derivative Instruments, Gain (Loss)
Amount of gain (loss) recognized in income on derivatives	(49)	[1]	(80)	[1]	(81)	[1]	(519)	[1]
Other (income) and expense | Equity contracts | Derivative instruments not designated as hedging instruments
Derivative Instruments, Gain (Loss)
Amount of gain (loss) recognized in income on derivatives	(2)	[1]			(2)	[1]
Cost of sales | Foreign exchange contracts | Derivative instruments in cash flow hedging relationships
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Earnings and Other Comprehensive Income, Effective Portion Reclassified from AOCI to Earnings	(23)		(7)		(49)		2
SG&A expense | Foreign exchange contracts | Derivative instruments in cash flow hedging relationships
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Earnings and Other Comprehensive Income, Effective Portion Reclassified from AOCI to Earnings	(7)		5		(8)		15
SG&A expense | Equity contracts | Derivative instruments not designated as hedging instruments
Derivative Instruments, Gain (Loss)
Amount of gain (loss) recognized in income on derivatives	$ 32	[1]	$ (26)	[1]	$ 53	[1]	$ 60	[1]

[1] The amount includes changes in clean fair values of the derivative instruments in fair value hedging relationships and the periodic accrual for coupon payments required under these derivative contracts.

[2] The amount includes basis adjustments to the carrying value of the hedged item recorded during the period and amortization of basis adjustments recorded on de-designated hedging relationships during the period.

[3] The amount of gain (loss) recognized in income represents ineffectiveness on hedge relationships.

[4] Instruments in net investment hedges include derivative and non-derivative instruments.