Financial Instruments: (Details 5) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in income on derivatives	$ 308	$ 226	$ (295)	[1]	$ 186	[1]
Gain (loss) recognized in earnings attributable to risk being hedged	31	35	257	[2]	50	[2]
Gain (Loss) Recognized in Earnings and Other Comprehensive Income, Effective Portion Recognized in OCI	(632)	(190)	(1)		42
Gain (Loss) Recognized in Earnings and Other Comprehensive Income, Effective Portion Reclassified from AOCI to Earnings	27	112	129		246
Gain (Loss) Recognized in Earnings and Other Comprehensive Income, (Ineffectiveness) and Amounts Excluded from Effectiveness Testing	1	6	3	[3]	12	[3]
Derivative instruments in fair value hedging relationships
Derivative Instruments, Gain (Loss) [Line Items]
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) [Line Items]
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) [Line Items]
Gain (Loss) Recognized in Earnings and Other Comprehensive Income, Effective Portion Recognized in OCI	(409)	(54)	(59)		65
Foreign exchange contracts | Derivative instruments in net investment hedging relationships
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Earnings and Other Comprehensive Income, Effective Portion Recognized in OCI	(223)	(136)	58	[4]	(23)	[4]
Cost of financing | Interest rate contracts | Derivative instruments in fair value hedging relationships
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in income, recognized on derivative instruments in fair value hedges	5	13	(82)	[1]	68	[1]
Gain (loss) recognized in earnings attributable to risk being hedged	19	19	156	[2]	27	[2]
Interest expense | Interest rate contracts | Derivative instruments in fair value hedging relationships
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in income, recognized on derivative instruments in fair value hedges	3	11	(53)	[1]	58	[1]
Gain (loss) recognized in earnings attributable to risk being hedged	12	16	101	[2]	23	[2]
Interest expense | Interest rate contracts | Derivative instruments in cash flow hedging relationships
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Earnings and Other Comprehensive Income, Effective Portion Reclassified from AOCI to Earnings		(2)			(6)
Interest expense | Foreign exchange contracts | Derivative instruments in net investment hedging relationships
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Earnings and Other Comprehensive Income, (Ineffectiveness) and Amounts Excluded from Effectiveness Testing	1	6	3	[3],[4]	9	[3],[4]
Other (income) and expense | Foreign exchange contracts | Derivative instruments in cash flow hedging relationships
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Earnings and Other Comprehensive Income, Effective Portion Reclassified from AOCI to Earnings	30	102	115		209
Gain (Loss) Recognized in Earnings and Other Comprehensive Income, (Ineffectiveness) and Amounts Excluded from Effectiveness Testing	0	0	0		3	[3]
Other (income) and expense | Foreign exchange contracts | Derivative instruments not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in income on derivatives	254	148	(265)	[1]	(56)	[1]
Cost of sales | Foreign exchange contracts | Derivative instruments in cash flow hedging relationships
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Earnings and Other Comprehensive Income, Effective Portion Reclassified from AOCI to Earnings	(17)	6	(15)		22
SG&A expense | Foreign exchange contracts | Derivative instruments in cash flow hedging relationships
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Earnings and Other Comprehensive Income, Effective Portion Reclassified from AOCI to Earnings	13	5	29		21
SG&A expense | Equity contracts | Derivative instruments not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in income on derivatives	$ 46	$ 54	$ 105	[1]	$ 116	[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.