Financial Instruments by Balance Sheet Grouping (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Assets
Cash and cash equivalents	$ 659		$ 1,000
Short-term investments	33,212		22,319
Long-term investments	15,392		14,149
Taxes and other current assets	367	[1]	296	[1]
Taxes and other noncurrent assets	961	[2]	1,086	[2]
Total	50,591		38,850
Liabilities
Short-term borrowings, including current portion of long-term debt	8,896	[3],[4]	6,424	[3],[4]
Other current liabilities	247	[5]	330	[5]
Long-term debt	31,481	[3],[6],[7]	31,036	[3],[6],[7]
Other noncurrent liabilities	701	[8]	374	[8]
Total selected financial liabilities	$ 41,325	[3]	$ 38,164	[3]

[1] As of March 31, 2013, derivative instruments at fair value include foreign currency forward-exchange contracts ($249 million), interest rate swaps ($64 million), and foreign currency swaps ($54 million) and, as of December 31, 2012, include foreign currency forward-exchange contracts ($152 million) and foreign currency swaps ($144 million).

[2] As of March 31, 2013, derivative instruments at fair value include interest rate swaps ($727 million) and foreign currency swaps ($234 million) and, as of December 31, 2012, include interest rate swaps ($1 billion) and foreign currency swaps ($50 million).

[3] Some carrying amounts may include adjustments for discount or premium amortization or for the effect of interest rate swaps designated as hedges.

[4] The differences between the estimated fair values and carrying values of held-to-maturity debt securities, private equity securities at cost and short-term borrowings not measured at fair value on a recurring basis were not significant as of March 31, 2013 or December 31, 2012. The fair value measurements of our held-to-maturity debt securities and our short-term borrowings are based on Level 2 inputs, using a market approach. The fair value measurements of our private equity securities at cost are based on Level 3 inputs, using a market approach.

[5] At March 31, 2013, derivative instruments at fair value include foreign currency swaps ($148 million) and foreign currency forward-exchange contracts ($99 million) and, as of December 31, 2012, include foreign currency forward-exchange contracts ($243 million) and foreign currency swaps ($87 million).

[6] The fair value of our long-term debt (not including the current portion of long-term debt) is $37.8 billion as of March 31, 2013 and $37.5 billion as of December 31, 2012. The fair value measurements for our long-term debt are based on Level 2 inputs, using a market approach.

[7] Includes foreign currency debt with fair values of $735 million as of March 31, 2013 and $809 million as of December 31, 2012, which are used as hedging instruments.

[8] At March 31, 2013, derivative instruments at fair value include foreign currency swaps ($675 million) and interest rate swaps ($26 million) and, as of December 31, 2012, include foreign currency swaps ($341 million) and interest rate swaps ($33 million).