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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.

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