Basis of Presentation and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Mar. 31, 2017
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation Our condensed consolidated financial statements include the accounts of all majority-owned or controlled subsidiaries, and all significant intercompany transactions and amounts have been eliminated. References to "we," "our," and similar pronouns in this Quarterly Report on Form 10-Q for the quarter ended March 31, 2017 (this "Form 10-Q") refer to Cardinal Health, Inc. and its majority-owned or controlled subsidiaries unless the context requires otherwise. Our condensed consolidated financial statements have been prepared in accordance with the U.S. Securities and Exchange Commission ("SEC") instructions to Quarterly Reports on Form 10-Q and include the information and disclosures required by accounting principles generally accepted in the United States ("GAAP") for interim financial reporting. The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect amounts reported in the condensed consolidated financial statements and accompanying notes. Actual amounts may differ from these estimated amounts. In our opinion, all adjustments necessary for a fair presentation of the condensed consolidated financial statements have been included. Except as disclosed elsewhere in this Form 10-Q, all such adjustments are of a normal and recurring nature. In addition, financial results presented for this fiscal 2017 interim period are not necessarily indicative of the results that may be expected for the full fiscal year ending June 30, 2017. These condensed consolidated financial statements are unaudited and, accordingly, should be read in conjunction with the audited consolidated financial statements and related notes contained in our Annual Report on Form 10-K for the fiscal year ended June 30, 2016 (the "2016 Form 10-K").
Inventories	Inventories A substantial portion of our inventories are valued at the lower of cost, using the last-in, first-out ("LIFO") method, or market. These inventories are included within the core pharmaceutical distribution facilities of our Pharmaceutical segment (“distribution facilities”) and are primarily merchandise inventories. The LIFO method presumes that the most recent inventory purchases are the first items sold, so LIFO helps us better match current costs and revenue. We believe that the average cost method of inventory valuation provides a reasonable approximation of the current cost of replacing inventory within these distribution facilities. As such, the LIFO reserve is the difference between (a) inventory at the lower of LIFO cost or market and (b) inventory at replacement cost determined using the average cost method of inventory valuation. Interim LIFO calculations are based on our estimates of the expected year-end inventory levels and costs, since the actual valuation of inventory under the LIFO method is computed at the end of the fiscal year based on the inventory levels, inventory mix and inventory cost inflation and deflation at that time. Based upon the year-to-date balance and expectations for the remainder of the fiscal year, we recorded a LIFO credit of $9 million in the three months ended March 31, 2017, which brings our year-to-date LIFO charges to zero. We recorded LIFO charges of $12 million and $51 million for the three and nine months ended March 31, 2016, respectively. These LIFO charges and credits are included in cost of products sold in the condensed consolidated financial statements.
Recent Financial Accounting Standards	Recent Financial Accounting Standards In January 2017, the Financial Accounting Standards Board ("FASB") issued amended accounting guidance that simplifies the accounting for goodwill impairment by eliminating the step of measuring a goodwill impairment by estimating the implied fair value of goodwill. Instead, goodwill impairment will be measured as the amount by which the reporting unit’s carrying value exceeds its fair value, limited to the carrying value of the goodwill. This guidance will be effective for us in the first quarter of fiscal 2021, with early adoption permitted. We are currently evaluating the timing of adoption. The impact of adoption is dependent on future events. Also in January 2017, the FASB issued new accounting guidance that changes the definition of a business when evaluating whether a set of transferred assets and activities is considered a business. This guidance will be effective for us in the first quarter of fiscal 2019, with early adoption permitted. We are currently evaluating the timing of adoption. The impact of adoption is dependent on future events. In November 2016, the FASB issued amended accounting guidance on the presentation of restricted cash and restricted cash equivalents in the statement of cash flows. The guidance requires an entity to include restricted cash and restricted cash equivalents with cash and cash equivalents when reconciling the beginning-of-period and end-of-period amounts shown on the statements of cash flows. This amendment will be effective for us in the first quarter of fiscal 2019, with early adoption permitted. We are currently evaluating the timing of adoption and the impact of this standard on our consolidated financial statements. In October 2016, the FASB issued amended accounting guidance that requires an entity to recognize the income tax effect of intercompany sales and transfers of assets other than inventory at the time that the transfer occurs rather than when the asset is sold to a third party. This amendment will be effective for us in the first quarter of fiscal 2019. We are currently evaluating the impact of this standard on our consolidated financial statements. In August 2016, the FASB issued accounting guidance which clarifies the classification of certain cash receipts and cash payments in the statement of cash flows, including those related to contingent consideration payments made after a business combination, distributions received from equity method investees, debt prepayment or debt extinguishment costs and proceeds from the settlement of insurance claims. This guidance will be effective for us in the first quarter of fiscal 2019. We are currently evaluating the impact of this standard on our consolidated financial statements. In April 2015, the FASB issued amended accounting guidance that clarifies the circumstances under which a cloud computing customer would account for the arrangement as a license of internal-use software. If it is determined that a software license does not exist in the arrangement, the customer would account for this arrangement as a service contract. We adopted this guidance in the first quarter of fiscal 2017. The adoption of this guidance did not have a material impact on our financial position or results of operations. Also in April 2015, the FASB issued amended accounting guidance related to the presentation of debt issuance costs in the financial statements. This guidance requires an entity to present such costs in the balance sheet as a direct deduction from the related debt rather than as an asset. We adopted this guidance in the first quarter of fiscal 2017. Upon adoption of this guidance, debt issuance costs of $29 million were reclassified from other assets to long-term obligations, less current portion within the condensed consolidated balance sheet. In May 2014, the FASB issued amended accounting guidance related to revenue recognition. This guidance is based on the principle that revenue is recognized in an amount that reflects the consideration to which an entity expects to be entitled in exchange for the transfer of goods or services to customers. The guidance also requires additional disclosure about the nature, amount, timing, and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments, and assets recognized from costs incurred to obtain or fulfill a contract. The FASB also subsequently issued several amendments to the standard, including clarification on principal versus agent considerations, performance obligations and licensing, and certain scope improvements and practical expedients. We have made progress on our evaluation of the amended guidance, including identification of revenue streams and customer contract reviews. Our revenue is primarily distribution revenue, which we recognize at a point in time when title transfers to customers and we have no further obligation to provide services related to such merchandise. Although we are continuing to assess the impact of the amended guidance, we generally anticipate that the timing of recognition of distribution revenue will be substantially unchanged under the amended guidance. The amended guidance will be effective for us in the first quarter of fiscal 2019 and permits adoption under either the full retrospective approach (recognize effects of the amended guidance in each prior reporting period presented) or the modified retrospective approach (recognize the cumulative effect of adoption as an adjustment to retained earnings at the date of initial application). We are still evaluating our method of adoption.