Basis of Presentation and Summary of Significant Accounting Policies	6 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	1. Basis of Presentation and Summary of Significant Accounting Policies 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. Investments in business entities in which we do not have control, but have the ability to exercise significant influence over operating and financial policies, are accounted for using the equity method. Refer to Note 4 for further information on our equity method investments. References to "we," "our," and similar pronouns in in this Quarterly Report on Form 10-Q for the quarter ended December 31, 2019 (this "Form 10-Q") refer to Cardinal Health, Inc. and its majority-owned or controlled subsidiaries unless the context requires otherwise. Our fiscal year ends on June 30. References to fiscal 2020 and 2019 in these condensed consolidated financial statements are to the fiscal years ending or ended June 30, 2020 and June 30, 2019, respectively. Our condensed consolidated financial statements have been prepared in accordance with the United States 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. To conform to the current year presentation, certain prior year amounts have been reclassified. In addition, financial results presented for this fiscal 2020 interim period are not necessarily indicative of the results that may be expected for the full fiscal year ending June 30, 2020. 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, 2019 (the "2019 Form 10-K"). Recently Adopted Financial Accounting Standards Derivatives and Hedging In October 2018, the Financial Accounting Standards Board ("FASB") issued amended accounting guidance related to derivatives and hedging which permits the use of the Secured Overnight Financing Rate ("SOFR") Overnight Index Swap ("OIS") as a benchmark interest rate for hedge accounting purposes. This guidance is effective beginning the first quarter of fiscal 2020 and must be applied on a prospective basis. The adoption did not have a material impact on our consolidated financial statements. Leases In February 2016, the FASB issued amended accounting guidance that requires lessees to recognize most leases on the balance sheet as a lease liability and corresponding right-of-use asset. The guidance also requires disclosures that meet the objective of enabling financial statement users to assess the amount, timing and uncertainty of cash flows arising from leases. We adopted this guidance during the first quarter of fiscal 2020 and elected the transition option which allows us to apply the guidance prospectively. The adoption resulted in the recognition of lease liabilities in the amount of $422 million and did not have a material impact on our results of operations, liquidity or debt covenant compliance under our current debt agreements. The majority of our lease spend relates to certain real estate with the remaining lease spend primarily related to vehicles and equipment. The adoption required certain changes to our systems and processes. See Note 5 for additional information regarding leases. Recently Issued Financial Accounting Standards Not Yet Adopted Financial Instruments - Credit Losses In June 2016, the FASB issued amended accounting guidance that will require entities to measure credit losses on trade and other receivables, held-to-maturity debt securities, loans and other instruments using an "expected credit loss" model that considers historical experience, current conditions and reasonable supportable forecasts. This guidance also requires that credit losses on available-for-sale debt securities with unrealized losses be recognized as allowances rather than as deductions in the amortized cost of the securities. This guidance will be effective for us in the first quarter of fiscal 2021. We are currently evaluating the impact of adoption on our consolidated financial statements.