| **Fair Value Measurements and Financial Instruments** | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                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| **Fair Value Disclosures [Abstract]**                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                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| Fair Value Measurements and Financial Instruments     | FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTSThe fair value measurement standard applies to certain financial assets and liabilities that are measured at fair value on a recurring basis (each reporting period) and certain financial assets and liabilities that are measured at fair value on a nonrecurring basis. The Company also maintains other financial instruments that approximate their fair value due to their short maturities, and include such instruments as its cash and cash equivalents, accounts receivable, accounts payable, accrued liabilities and current and long-term debt obligations.Assets and Liabilities that are Measured at Fair Value on a Recurring BasisThe Company's financial assets and liabilities that are measured at fair value on a recurring basis include money-market securities, available-for-sale marketable securities, trading marketable securities, derivative instruments and contingent consideration liabilities. The Company does not have any material nonfinancial assets or liabilities that are measured at fair value on a recurring basis. A summary of the valuation methodologies used for the respective financial assets and liabilities measured at fair value on a recurring basis is as follows:Money-market securities: The Company’s money-market securities include funds that are traded in active markets and are recorded at fair value based upon the quoted market prices. The Company classifies these securities as level 1.Available-for-sale securities: The Company’s available-for-sale securities include publicly-traded equity securities that are traded in active markets and are recorded at fair value based upon the closing stock prices. The Company classifies these securities as level 1. Trading securities: The Company’s trading securities include publicly-traded mutual funds that are traded in active markets and are recorded at fair value based upon quoted market prices of the net asset values of the funds. The Company classifies these securities as level 1.Derivative instruments:  Fair values for the Company’s derivative financial instruments are based on quoted market prices of comparable instruments, if available, or more commonly on standard pricing models that use readily observable market parameters from industry standard data providers as their basis. These models reflect contractual terms of the derivatives, including period to maturity and market-based parameters such as foreign currency exchange rates. They do not contain a high level of subjectivity as the techniques used in the models do not require significant judgment and inputs are readily observable from actively quoted markets. The Company classifies these instruments as level 2 (see Note 12). Contingent consideration liabilities: The fair value of the Company's contingent liabilities is initially measured based on the consideration expected to be transferred (probability-weighted), discounted back to present value. The discount rate used is determined at the time of measurement in accordance with accepted valuation methods. The Company measures the liability on a recurring basis using Level 3 inputs including regulatory approval timing, projected revenues or cash flows, growth rates, discount rates, probabilities of payment and projected payment dates. Projected revenues are based on the Company's most recent internal operating budgets and long-term strategic plans. Changes to any of the inputs may result in significantly higher or lower fair value measurements. A summary of assets and liabilities measured at fair value on a recurring basis at January 2, 2016 and January 3, 2015 is as follows (in millions): Balance SheetClassificationJanuary 2, 2016 Quoted PricesIn ActiveMarkets(Level 1) SignificantOtherObservableInputs(Level 2) SignificantUnobservableInputs(Level 3)Assets        Money-market securitiesCash and cash equivalents$273 $273 $— $—Available-for-sale securitiesOther current assets10 10 — —Foreign currency forward contractsOther current assets14 — 14 —Trading securitiesOther assets302 302 — —Foreign currency forward contractsOther assets2 — 2 —Total assets $601 $585 $16 $—         Liabilities        Contingent considerationOther current liabilities$118 $— $— $118Foreign currency forward contractsOther current liabilities6 — 6 —Contingent considerationOther liabilities33 — — 33Foreign currency forward contractsOther liabilities3 — 3 —Total liabilities $160 $— $9 $151 Balance SheetClassificationJanuary 3, 2015 Quoted PricesIn ActiveMarkets(Level 1) SignificantOtherObservableInputs(Level 2) SignificantUnobservableInputs(Level 3)Assets        Money-market securitiesCash and cash equivalents$729 $729 $— $—Available-for-sale securitiesOther current assets30 30 — —Trading securitiesOther assets301 301 — —Total assets $1,060 $1,060 $— $—         Liabilities        Contingent considerationOther liabilities$50 $— $— $50Total liabilities $50 $— $— $50The recurring Level 3 fair value measurements of the Company's contingent consideration liabilities include the following significant unobservable inputs (in millions):Contingent Consideration LiabilitiesFair Value as of January 2, 2016Valuation Technique Unobservable Input Value or Range         Spinal Modulation regulatory-based milestone$118Probability Weighted Discounted Cash Flow Discount Rate   2.1%    Probability of Payment   95%    Projected Year of Payment   2016         Spinal Modulation revenue-based milestones and earn-outs4Monte Carlo Simulation Discount Rates 1.3%-17.0%    Expected Revenue Volatility   25.0%    Projected Years of Payments 2017, 2018         Nanostim, Inc. (Nanostim) revenue-based milestones2Probability Weighted Discounted Cash Flow Discount Rate   5.0%    Probability of Payments   10.0%    Projected Years of Payments 2017, 2018         Assumed from Thoratec regulatory-based and revenue-based milestones27Probability Weighted Discounted Cash Flow Discount Rate   5.5%    Probability of Payments —%-90.0%    Projected Years of Payments 2017-2020Total contingent consideration liabilities$151       Additionally, the following table provides a reconciliation of the beginning and ending balances of the Company's contingent consideration liabilities (in millions): EndosenseNanostimSpinal ModulationAssumed from ThoratecTotalBalance as of December 29, 2012$—$—$—$—$—Initial fair value measurement of contingent consideration13256——188Change in fair value of contingent consideration1———1Foreign currency translation6———6Balance as of December 28, 201313956——195Change in fair value of contingent consideration28(6)——22Payment of contingent consideration(155)———(155)Foreign currency translation(12)———(12)Balance as of January 3, 2015—50——50Initial fair value measurement of contingent consideration——155—155Liabilities assumed from Thoratec acquisition———3333Change in fair value of contingent consideration—(48)(33)(6)(87)Balance as of January 2, 2016$—$2$122$27$151In February 2016, the Company received FDA approval of the Axium Neurostimulator System and expects to record a charge in the first quarter of 2016 to reflect the value at which the contingent consideration will be settled.The following table provides a reconciliation of the beginning and ending balances of the Company's auction rate securities (in millions): Auction Rate SecuritiesBalance as of January 3, 2015$—Auction rate securities acquired from Thoratec5Sale of auction rate securities(5)Balance as of January 2, 2016$—Assets and Liabilities that are Measured at Fair Value on a Nonrecurring BasisDisclosures are required for certain assets and liabilities that are measured at fair value but are recognized and disclosed at fair value on a nonrecurring basis in periods subsequent to initial recognition. For St. Jude Medical, such measurements of fair value primarily relate to long-lived assets, goodwill, indefinite-lived intangible assets and cost method investments.A summary of the valuation methodologies used for the respective nonfinancial assets and liabilities measured at fair value on a nonrecurring basis is as follows:Long-lived assets: Typically the Company measures the fair value of its long-lived assets, such as its definite-lived intangible assets and property, plant and equipment using independent appraisals, market models and discounted cash flow models. A discounted cash flow model requires inputs to a present value cash flow calculation including a risk-adjusted discount rate, operating budgets, long-term strategic plans and remaining useful lives of the asset or asset group. During 2015, 2014 and 2013, the Company recognized $18 million, $25 million and $14 million of fixed asset write-offs. During 2015, the fixed asset write-offs were primarily related to software development assets no longer expected to be utilized. During 2014, the fixed asset write-offs were associated with the discontinuation of a clinical trial and projects abandoned under the new realigned structure. During 2013, the fixed asset write-offs primarily related to information technology assets no longer expected to be utilized under the new realigned structure. Typically the Company measures these assets using independent appraisals, market models and discounted cash flow models; however, as these fixed assets had no alternative future use and therefore no discrete future cash flows, the assets were fully impaired. During both 2015 and 2013, the Company recognized $2 million and $13 million, respectively, of impairment charges related to customer relationship intangible assets. Due to changes in hospital purchasing practices, the Company determined that the intangible assets no longer had any future discrete cash flows and that the assets were fully impaired.Goodwill: During the third quarter of 2014, the Company performed an interim goodwill impairment test because it significantly changed the composition of the net assets of its reporting units whereby it combined its two legacy reporting units. For this test, the Company bypassed the qualitative assessment and proceeded directly to step one of the two-step goodwill impairment test. In performing the first step, the Company utilized the market approach as computed by its market capitalization plus an estimated control premium. As a result of performing this test, the Company determined that no impairment existed. The fair value inputs utilized in the market approach are considered Level 2 in the fair value hierarchy due to the utilization of quoted prices in active markets for similar assets or liabilities in determining the estimated control premium. During the fourth quarters of 2015 and 2014, the Company performed its annual goodwill impairment test by bypassing the qualitative assessment and proceeding directly to step one using the market approach described above. As a result of performing these tests, the Company determined that no impairments existed.During the fourth quarter of 2013, the Company assessed qualitative factors and determined that no impairments existed since it was more-likely-than-not that the fair values of its reporting units that existed at that time were more than their carrying amounts. The qualitative assessment considered such factors as macroeconomic conditions, industry and market considerations, cost factors, financial performance, entity specific events, changes in net assets and a sustained decrease in share price.Indefinite-lived intangible assets: The Company also reviews its indefinite-lived intangible assets at least annually to determine if any adverse conditions exist that would indicate a potential impairment by considering qualitative factors such as macroeconomic conditions, industry and market considerations, cost factors, financial performance, entity specific events, changes in net assets and project-based performance toward regulatory approvals. During 2015, the Company performed its annual qualitative assessment of its indefinite-lived intangible assets by considering many of the above factors. Additionally, for certain indefinite-lived intangible asset the Company bypassed the qualitative assessment and performed a quantitative assessment using discounted cash flow models. There were no impairments of indefinite-lived intangible assets in 2015.During 2014, the Company recognized impairment charges of $58 million for certain IPR&D intangible assets and a tradename intangible asset to reflect their estimated fair value of $55 million. The Company utilized a discounted cash flow model for each individual asset. The impairments were triggered by clinical information received in the third and fourth quarters of 2014, resulting in the Company revising its expectations, including a decrease in the market opportunity and an increase in the cost and length of time to bring the related products to market. The fair value measurements of these intangible assets are considered Level 3 in the fair value hierarchy due to the use of unobservable inputs to measure fair value, including the terminal growth rate, royalty rate, discount rate and projected future cash flows. During 2013, the Company performed its annual qualitative assessment of its indefinite-lived intangible assets by considering many of the above factors and determined that a quantitative impairment analysis was further necessary for certain indefinite-lived tradename and IPR&D assets as the Company concluded it was more-likely-than-not that the fair value of these assets were less than their respective carrying amounts. The Company utilized a discounted cash flow model for each individual asset and recognized an impairment charge of $29 million to write-down the related assets to their estimated fair value of $50 million. The impairments were due primarily to the Company's revised expectations, including an increase in the cost and length of time to bring the related products to market through regulatory approval. The fair value measurements of these intangible assets are considered Level 3 in the fair value hierarchy due to the use of unobservable inputs used to measure fair value, including the terminal growth rate, royalty rate, discount rate and projected future cash flows. Cost method investments: The Company also holds investments in equity securities that are accounted for as cost method investments, which are classified as other assets and measured at fair value on a nonrecurring basis. The carrying value of these investments was $80 million and $71 million as of January 2, 2016 and January 3, 2015, respectively. The fair value of the Company’s cost method investments is not estimated if there are no identified events or changes in circumstances that may have a significant adverse effect on the fair value of these investments. When measured on a nonrecurring basis, the Company’s cost method investments are considered Level 3 in the fair value hierarchy due to the use of unobservable inputs to measure fair value. Fair Value Measurements of Other Financial InstrumentsThe aggregate fair value of the Company’s fixed-rate senior notes as of January 2, 2016 (measured using quoted prices in active markets) was $3,740 million compared to the aggregate carrying value of $3,774 million (inclusive of the terminated interest rate swaps and unamortized debt discounts). The fair value of the Company’s variable-rate debt obligations as of January 2, 2016 approximated their aggregate $2,651 million carrying value due to the nature of their variable interest rates. The Company also had $393 million and $713 million of cash equivalents invested in short-term deposits and interest and non-interest bearing bank accounts as of January 2, 2016 and January 3, 2015, respectively, the cost basis of which approximated fair value. |

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| - Definition
The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.
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