Financial Instruments: (Details 5) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Derivative Instruments, Gain (Loss)
Amount of gain (loss) recognized in income on derivatives	$ (26)	$ 131
Gain (loss) recognized in earnings attributable to risk being hedged	102	86
Gain (Loss) Recognized in Earnings and Other Comprehensive Income, Effective Portion Recognized in OCI	12	(388)
Gain (Loss) Recognized in Earnings and Other Comprehensive Income, Effective Portion Reclassified from AOCI to Earnings	24	(101)
Gain (Loss) Recognized in Earnings and Other Comprehensive Income, (Ineffectiveness) and Amounts Excluded from Effectiveness Testing	3	(1)
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	51	(237)
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	(37)	(151)
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	(24)	(9)
Gain (loss) recognized in earnings attributable to risk being hedged	57	52
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	(19)	(6)
Gain (loss) recognized in earnings attributable to risk being hedged	45	34
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	(2)	(2)
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, Effective Portion Reclassified from AOCI to Earnings		0
Gain (Loss) Recognized in Earnings and Other Comprehensive Income, (Ineffectiveness) and Amounts Excluded from Effectiveness Testing	2	(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	20	(47)
Gain (Loss) Recognized in Earnings and Other Comprehensive Income, (Ineffectiveness) and Amounts Excluded from Effectiveness Testing	1	0
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	(81)	87
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	5	(34)
Selling, general and administrative 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	2	(17)
Selling, general and administrative expense | Equity contracts | Derivative instruments not designated as hedging instruments
Derivative Instruments, Gain (Loss)
Amount of gain (loss) recognized in income on derivatives	$ 98	$ 59