Basis of Presentation and Summary of Significant Accounting Policies	3 Months Ended
Sep. 30, 2017
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. References to "we," "our," and similar pronouns in this Quarterly Report on Form 10-Q for the quarter ended September 30, 2017 (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 2018 and 2017 in these condensed consolidated financial statements are to the fiscal years ending or ended June 30, 2018 and June 30, 2017, respectively. 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 2018 interim period are not necessarily indicative of the results that may be expected for the full fiscal year ending June 30, 2018. 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, 2017 (the "2017 Form 10-K"). Recent Financial Accounting Standards In August 2017, the Financial Accounting Standards Board (the "FASB") issued accounting guidance which is intended to improve and simplify accounting rules around hedge accounting. The guidance will be effective for us in the first quarter of fiscal 2020 and early adoption is permitted. We are currently evaluating the impact of this standard on our condensed consolidated financial statements. In March 2016, the FASB issued amended accounting guidance that changed the accounting for certain aspects of share-based compensation to employees. The guidance requires all income tax effects of share-based awards to be recognized in the statement of earnings as awards vest or are settled. Additionally, the guidance increases the amount employers can withhold in shares to cover employee income taxes without requiring liability classification and allows a policy election for accounting for forfeitures. The primary impact of adoption resulted in the recognition of excess tax benefits in the statement of earnings on a prospective basis, rather than as a component of equity. The impact on the presentation in the condensed consolidated statement of cash flows is also prospective. We adopted this guidance in the first quarter of fiscal 2018. The impact of adoption on the provision for income taxes on our condensed consolidated statement of earnings was immaterial. The inclusion of excess tax benefits and deficiencies as a component of our income tax expense will increase volatility within our provision for income taxes as the amount of excess tax benefits or deficiencies from share-based compensation awards depends on our stock price at the date the awards vest. 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 continue to make progress on our evaluation of the amended revenue recognition 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.

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. References to "we," "our," and similar pronouns in this Quarterly Report on Form 10-Q for the quarter ended September 30, 2017 (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 2018 and 2017 in these condensed consolidated financial statements are to the fiscal years ending or ended June 30, 2018 and June 30, 2017, respectively.

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 2018 interim period are not necessarily indicative of the results that may be expected for the full fiscal year ending June 30, 2018. 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, 2017 (the "2017 Form 10-K").

Recent Financial Accounting Standards

In August 2017, the Financial Accounting Standards Board (the "FASB") issued accounting guidance which is intended to improve and simplify accounting rules around hedge accounting. The guidance will be effective for us in the first quarter of fiscal 2020 and early adoption is permitted. We are currently evaluating the impact of this standard on our condensed consolidated financial statements.

In March 2016, the FASB issued amended accounting guidance that changed the accounting for certain aspects of share-based compensation to employees. The guidance requires all income tax effects of share-based awards to be recognized in the statement of earnings as awards vest or are settled. Additionally, the guidance increases the amount employers can withhold in shares to cover employee income taxes without requiring liability classification and allows a policy election for accounting for forfeitures. The primary impact of adoption resulted in the recognition of excess tax benefits in the statement of earnings on a prospective basis, rather than as a component of equity. The impact on the presentation in the condensed consolidated statement of cash flows is also prospective. We adopted this guidance in the first quarter of fiscal 2018. The impact of adoption on the provision for income taxes on our condensed consolidated statement of earnings was immaterial. The inclusion of excess tax benefits and deficiencies as a component of our income tax expense will increase volatility within our provision for income taxes as the amount of excess tax benefits or deficiencies from share-based compensation awards depends on our stock price at the date the awards vest.

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 continue to make progress on our evaluation of the amended revenue recognition 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.