Financial Instruments - Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Millions		Oct. 01, 2017	Dec. 31, 2016
Other selected financial assets
Total selected financial assets		$ 22,815	$ 24,175
Short-term borrowings:
Total short-term borrowings, carried at historical proceeds, as adjusted	[1],[2]	9,448	10,688
Long-term debt:
Total long-term debt, carried at historical proceeds, as adjusted	[1],[3]	34,503	31,398
Total		43,951	42,085
Total selected financial liabilities		45,124	43,750
Reported Value Measurement [Member]
Other selected financial assets
Held-to-maturity debt securities, carried at amortized cost	[2],[4]	1,464	1,242
Restricted stock and private equity securities, carried at cost or at equity-method	[2]	719	735
Total		2,183	1,977
Long-term debt [Member]
Short-term borrowings:
Net fair value adjustments related to hedging and purchase accounting		981	998
Net unamortized discounts, premiums and debt issuance costs		(149)	(130)
Long-term debt:
Principal amount		33,671	30,529
Short-term Debt [Member]
Short-term borrowings:
Principal amount		9,460	10,674
Net fair value adjustments related to hedging and purchase accounting		2	24
Net unamortized discounts, premiums and debt issuance costs		(15)	(11)
Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Trading funds and securities	[5],[6]	347	325
Selected financial assets measured at fair value on a recurring basis	[6],[7]	20,631	22,198
Selected financial liabilities measured at fair value on a recurring basis
Derivative financial instruments in a liability position	[6],[8]	1,173	1,665
Fair Value, Measurements, Recurring [Member] | Interest Rate Swaps [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative financial instruments in a receivable position	[6],[7]	630	625
Selected financial liabilities measured at fair value on a recurring basis
Derivative financial instruments in a liability position	[6],[8]	154	148
Fair Value, Measurements, Recurring [Member] | Foreign Currency Swap [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative financial instruments in a receivable position	[6],[7]	92	79
Selected financial liabilities measured at fair value on a recurring basis
Derivative financial instruments in a liability position	[6],[8]	710	1,374
Fair Value, Measurements, Recurring [Member] | Foreign Currency Forward-Exchange Contracts [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative financial instruments in a receivable position	[6],[7]	110	551
Selected financial liabilities measured at fair value on a recurring basis
Derivative financial instruments in a liability position	[6],[8]	309	143
Fair Value, Measurements, Recurring [Member] | Available-for-sale Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	[4],[6]	16,598	18,632
Fair Value, Measurements, Recurring [Member] | Money Market Funds [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	[6]	1,824	1,445
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	[4],[6]	$ 1,032	$ 540

[1] Amounts may not add due to rounding.

[2] The differences between the estimated fair values and carrying values of held-to-maturity debt securities, restricted stock and private equity securities at cost, and short-term borrowings not measured at fair value on a recurring basis were not significant as of October 1, 2017 or December 31, 2016. 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 carried at cost are based on Level 3 inputs.

[3] The fair value of our long-term debt (not including the current portion of long-term debt) was $39.0 billion as of October 1, 2017 and $34.9 billion as of December 31, 2016. The fair value measurements for our long-term debt are based on Level 2 inputs, using a market approach. Long-term debt includes foreign currency long-term borrowings with fair values of $4.7 billion as of October 1, 2017, which are used as hedging instruments.

[4] Gross unrealized gains and losses are not significant, except as of October 1, 2017, available-for-sale equity securities’ unrealized gains are $406 million and unrealized losses are $119 million.

[5] As of October 1, 2017, trading funds and securities are composed of $274 million of trading equity funds and $74 million of trading debt funds. As of December 31, 2016, trading funds and securities are composed of $236 million of trading equity funds and $89 million of trading debt funds. As of October 1, 2017 and December 31, 2016, trading equity funds of $63 million and $71 million, respectively, are held in trust for benefits attributable to the former Pharmacia Savings Plus Plan.

[6] We use a market approach in valuing financial instruments on a recurring basis. All of our financial assets and liabilities measured at fair value on a recurring basis use Level 2 inputs in the calculation of fair value, except 5% that use Level 1 inputs.

[7] Designated as hedging instruments, except for certain contracts used as offsets; namely, foreign currency forward-exchange contracts with fair values of $40 million as of October 1, 2017; and foreign currency forward-exchange contracts with fair values of $162 million as of December 31, 2016.

[8] Designated as hedging instruments, except for certain contracts used as offsets; namely, foreign currency forward-exchange contracts with fair values of $60 million as of October 1, 2017; and foreign currency swaps with fair values of $269 million and foreign currency forward-exchange contracts with fair values of $113 million as of December 31, 2016.