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Financial Instruments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivatives designated as hedging instruments, Asset Derivatives | $ 50 |  | $ 50 |  | $ 178
Derivatives not designated as hedging instruments, Asset Derivatives | 61 |  | 61 |  | 75
Derivatives designated as hedging instruments, Liability Derivatives | 118 |  | 118 |  | 18
Derivatives not designated as hedging instruments, Liability Derivatives | 96 |  | 96 |  | 60
Four Quarter Rolling Average of Notional Amount of Foreign Exchange Contracts Hedging Foreign Currency Transactions | 20,500 |  | $ 20,500 |  | 19,100
Description of Net Investment Hedge Activity |  |  | We have approximately €4.95 billion of euro-denominated long-term debt and €750 million of euro-denominated commercial paper borrowings outstanding, which qualify as a net investment hedge against our investments in European businesses. As of June 30, 2018, the net investment hedge is deemed to be effective. |  |
Gain (loss) recorded in Accumulated other comprehensive loss | (245) | $ 66 | $ (200) | $ 130 |
(Gain) loss reclassified from Accumulated other comprehensive loss into Product Sales (effective portion) | (1) | 5 | $ (28) | 10 |
Maximum Length of Time, Foreign Currency Cash Flow Hedge |  |  | 4 years 22 days |  |
Gain recognized in Other income, net | 19 | $ 28 | $ 70 | $ 40 |
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months | (33) |  | (33) |  |
Other Current Assets [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivatives designated as hedging instruments, Asset Derivatives | 23 |  | 23 |  | 77
Derivatives not designated as hedging instruments, Asset Derivatives | 39 |  | 39 |  | 70
Other Noncurrent Assets [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivatives designated as hedging instruments, Asset Derivatives | 27 |  | 27 |  | 101
Derivatives not designated as hedging instruments, Asset Derivatives | 22 |  | 22 |  | 5
Accrued Liabilities [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivatives designated as hedging instruments, Liability Derivatives | 43 |  | 43 |  | 10
Derivatives not designated as hedging instruments, Liability Derivatives | 93 |  | 93 |  | 57
Other Long-term Liabilities [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivatives designated as hedging instruments, Liability Derivatives | 75 |  | 75 |  | 8
Derivatives not designated as hedging instruments, Liability Derivatives | $ 3 |  | $ 3 |  | $ 3

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