Significant Accounting Policies (Policies)	12 Months Ended
Significant Accounting Policies (Policies)	Mar. 31, 2017
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation: The consolidated financial statements and accompanying notes are prepared in accordance with U. S. generally accepted accounting principles (“GAAP”). The consolidated financial statements of McKesson include the financial statements of all wholly-owned subsidiaries and majority-owned or controlled companies. For those consolidated subsidiaries where our ownership is less than 100%, the portion of the net income or loss allocable to the noncontrolling interests is reported as “Net Income or Loss Attributable to Noncontrolling Interests” on the consolidated statements of operations. All significant intercompany balances and transactions have been eliminated in consolidation. We consider ourselves to control an entity if we are the majority owner of or have voting control over such entity. We also assess control through means other than voting rights (“variable interest entities” or “VIEs”) and determine which business entity is the primary beneficiary of the VIE. We consolidate VIEs when it is determined that we are the primary beneficiary of the VIE.
Fiscal Period	Fiscal Period: The Company’s fiscal year begins on April 1 and ends on March 31. Unless otherwise noted, all references to a particular year shall mean the Company’s fiscal year.
Reclassifications	Reclassifications: Certain prior year amounts have been reclassified to conform to the current year presentation.
Use of Estimates	Use of Estimates: The preparation of financial statements in conformity with U.S. GAAP requires that we make estimates and assumptions that affect the reported amounts in the consolidated financial statements and accompanying notes. Actual amounts could differ from those estimated amounts.
Cash and Cash Equivalents	Cash and Cash Equivalents: All highly liquid debt and money market instruments purchased with original maturity of three months or less at the date of acquisition are included in cash and cash equivalents. Cash equivalents are carried at fair value. Cash equivalents are primarily invested in AAA rated prime and U.S. government money market funds denominated in U.S. dollars, AAA rated prime money market funds denominated in Euros, overnight repurchase agreements collateralized by U.S. government securities, Canadian government securities and/or securities that are guaranteed or sponsored by the U.S. government and an AAA rated prime money market fund denominated in British pound sterling. The remaining cash and cash equivalents are deposited with several financial institutions. Deposits may exceed the amounts insured by the Federal Deposit Insurance Corporation in the U.S. and similar deposit insurance programs in other jurisdictions. We mitigate the risk of our short-term investment portfolio by depositing funds with reputable financial institutions and monitoring risk profiles and investment strategies of money market funds.
Restricted Cash	Restricted Cash: Cash that is subject to legal restrictions or is unavailable for general operating purposes is classified as restricted cash and is included within “Prepaid expenses and other” and “Other Noncurrent Assets” in the consolidated balance sheets.
Marketable Securities Available-for-Sale	Marketable Securities Available-for-Sale: We carry our marketable securities, which are available-for-sale, at fair value and they are included in prepaid expenses and other in the consolidated balance sheets. The unrealized gains and losses, net of the related tax effect, computed in marking these securities to market have been reported within stockholders’ equity. At March 31, 2017 and 2016, marketable securities were not material. In determining whether an other-than-temporary decline in market value has occurred, we consider the duration that, and extent to which, the fair value of the investment is below its cost, the financial condition and future prospects of the issuer or underlying collateral of a security, and our intent and ability to retain the security in order to allow for an anticipated recovery in fair value. Other-than-temporary declines in fair value from amortized cost for available-for-sale equity securities that we intend to sell or would more likely than not be required to sell before the expected recovery of the amortized cost basis are charged to other income, net, in the period in which the loss occurs.
Equity Method Investments	Equity Method Investments: 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. We evaluate our equity method investments for impairment whenever an event or change in circumstances occurs that may have a significant adverse impact on the carrying value of the investment. If a loss in value has occurred that is deemed to be other than temporary, an impairment loss is recorded. Refer to Financial Note 2, “Healthcare Technology Net Asset Exchange” for further information relating to our equity method investment in Change Healthcare, LLC.
Concentrations of Credit Risk and Receivables	Concentrations of Credit Risk and Receivables: Our trade receivables are subject to a concentration of credit risk with customers primarily in our Distribution Solutions segment. During 2017, sales to our ten largest customers, including group purchasing organizations (“GPOs”) accounted for approximately 54.2% of our total consolidated revenues. Sales to our largest customer, CVS Health (“CVS”), accounted for approximately 20.2% of our total consolidated revenues. At March 31, 2017, trade accounts receivable from our ten largest customers were approximately 33.7% of total trade accounts receivable. Accounts receivable from CVS were approximately 17.8% of total trade accounts receivable. As a result, our sales and credit concentration is significant. We also have agreements with GPOs, each of which functions as a purchasing agent on behalf of member hospitals, pharmacies and other healthcare providers, as well as with government entities and agencies. The accounts receivables balances are with individual members of the GPOs, and therefore no significant concentration of credit risk exists. A default in payment, a material reduction in purchases from these or any other large customers, or the loss of a large customer or customer groups could have a material adverse impact on our financial condition, results of operations and liquidity. In addition, trade receivables are subject to a concentration of credit risk with customers in the institutional, retail and healthcare provider sectors, which can be affected by a downturn in the economy and changes in reimbursement policies. This credit risk is mitigated by the size and diversity of the customer base as well as its geographic dispersion. We estimate the receivables for which we do not expect full collection based on historical collection rates and ongoing evaluations of the creditworthiness of our customers. An allowance is recorded in our consolidated financial statements for these amounts.
Financing Receivables	Financing Receivables: We assess and monitor credit risk associated with financing receivables, primarily lease and notes receivables, through regular review of our collection experience in determining our allowance for loan losses. On an ongoing basis, we also evaluate credit quality of our financing receivables utilizing aging of receivables and write-offs, as well as considering existing economic conditions, to determine if an allowance is necessary. Financing receivables are derecognized if legal title to them has been transferred and all related risks and rewards incidental to ownership have passed to the buyer.
Inventories	Inventories: We report inventories at the lower of cost or market (“LCM”). Inventories for our Distribution Solutions segment consist of merchandise held for resale. For our Distribution Solutions segment, the majority of the cost of domestic inventories is determined using the last-in, first-out (“LIFO”) method. The majority of the cost of inventories held in foreign locations is based on weighted average purchase prices using the first-in, first-out method (“FIFO”). Technology Solutions segment inventories consist of computer hardware with cost generally determined by the standard cost method, which approximates average cost. Rebates, cash discounts, and other incentives received from vendors are recognized within cost of sales upon the sale of the related inventory. The LIFO method was used to value approximately 70% and 74% of our inventories at March 31, 2017 and 2016. If we had used the FIFO method of inventory valuation, which approximates current replacement costs, inventories would have been approximately $1,005 million and $1,012 million higher than the amounts reported at March 31, 2017 and 2016, respectively. These amounts are equivalent to our LIFO reserves. Our LIFO valuation amount includes both pharmaceutical and non-pharmaceutical products. We recognized LIFO related credits of $7 million in 2017 and net LIFO charges of $244 million and $337 million in 2016 and 2015 in cost of sales within our consolidated statements of operations. A LIFO charge is recognized when the net effect of price increases on pharmaceutical and non-pharmaceutical products held in inventory exceeds the impact of price declines, including the effect of branded pharmaceutical products that have lost market exclusivity. A LIFO credit is recognized when the net effect of price declines exceeds the impact of price increases on pharmaceutical and non-pharmaceutical products held in inventory. We believe that the average inventory costing method provides a reasonable estimation of the current cost of replacing inventory (i.e., “market”). As such, our LIFO inventory is valued at the lower of LIFO cost or market.
Shipping and Handling Costs	Shipping and Handling Costs: We include costs to pack and deliver inventory to our customers in selling, distribution and administrative expenses.
Property, Plant and Equipment	Property, Plant and Equipment: We state our property, plant and equipment (“PPE”) at cost and depreciate them under the straight-line method at rates designed to distribute the cost of PPE over estimated service lives ranging from one to thirty years. When certain events or changes in operating conditions occur, an impairment assessment may be performed on the recoverability of the carrying amounts.
Goodwill	Goodwill: Goodwill is tested for impairment on an annual basis in the fourth quarter or more frequently if indicators for potential impairment exist. Impairment testing is conducted at the reporting unit level, which is generally defined as a component, one level below our Distribution Solutions and Technology Solutions operating segments, for which discrete financial information is available and segment management regularly reviews the operating results of that unit. The first step in goodwill testing requires us to compare the estimated fair value of a reporting unit to its carrying value. This step may be performed utilizing either a qualitative or quantitative assessment. If the carrying value of the reporting unit is lower than its estimated fair value, no further evaluation is necessary. If the carrying value of the reporting unit is higher than its estimated fair value, the second step must be performed to measure the amount of impairment loss. Under the second step, the implied fair value of goodwill is calculated in a hypothetical analysis by subtracting the fair value of all assets and liabilities of the reporting unit, including any unrecognized intangible assets, from the fair value of the reporting unit calculated in the first step of the impairment test. If the carrying value of goodwill for the reporting unit exceeds the implied fair value of goodwill, an impairment charge is recorded for that excess. To estimate the fair value of our reporting units, we use a combination of the market approach and the income approach. Under the market approach, we estimate fair value by comparing the business to similar businesses or guideline companies whose securities are actively traded in public markets. Under the income approach, we use a discounted cash flow model in which cash flows anticipated over several periods, plus a terminal value at the end of that time horizon, are discounted to their present value using an appropriate expected rate of return. The fair value estimates in the goodwill impairment analysis are highly sensitive to the discount rates used in the expected cash flows attributable to the reporting units. The discount rates are the weighted average cost of capital measuring the reporting units’ cost of debt and equity financing weighted by the percentage of debt and percentage of equity in a company’s target capital. Other estimates inherent in both the market and income approaches include long-term growth rates, projected revenues, earnings and cash flow forecasts for the reporting units. In addition, we compare the aggregate of the reporting units’ fair value to the Company’s market capitalization as a further corroboration of the fair values. The testing requires a complex series of assumptions and judgment by management in projecting future operating results, selecting guideline companies for comparisons and assessing risks. The use of alternative assumptions and estimates could affect the fair values and change the impairment determinations.
Intangible Assets	Intangible Assets: Currently all of our intangible assets are subject to amortization and are amortized based on the pattern of their economic consumption or on a straight-line basis over their estimated useful lives, ranging from one to 38 years. We review intangible assets for impairment whenever events or changes in circumstances indicate that the carrying value of the assets may not be recoverable. Determination of recoverability is based on the lowest level of identifiable estimated future undiscounted cash flows resulting from use of the asset and its eventual disposition. Measurement of any impairment loss is based on the excess of the carrying value of the asset over its fair market value.
Capitalized Software Held for Sale	Capitalized Software Held for Sale: Development costs for software held for sale, which primarily pertain to our Technology Solutions segment, are capitalized once a project has reached the point of technological feasibility. Completed projects are amortized after reaching the point of general availability using the straight-line method based on an estimated useful life of approximately three years. At each balance sheet date, or earlier if an indicator of an impairment exists, we evaluate the recoverability of unamortized capitalized software costs based on estimated future undiscounted revenues net of estimated related costs over the remaining amortization period.
Capitalized Software Held for Internal Use	Capitalized Software Held for Internal Use: We capitalize costs of software held for internal use during the application development stage of a project and amortize those costs over their estimated useful lives ranging from one to ten years.
Insurance Programs	Insurance Programs: Under our insurance programs, we seek to obtain coverage for catastrophic exposures as well as those risks required to be insured by law or contract. It is our policy to retain a significant portion of certain losses primarily related to workers’ compensation and comprehensive general, product and vehicle liability. Provisions for losses expected under these programs are recorded based upon our estimate of the aggregate liability for claims incurred as well as for claims incurred but not yet reported. Such estimates utilize certain actuarial assumptions followed in the insurance industry.
Revenue Recognition	Revenue Recognition: Distribution Solutions Revenues for our Distribution Solutions segment are recognized when persuasive evidence of an arrangement exists, product is delivered and title passes to the customer or when services have been rendered and there are no further obligations to the customer, the price is fixed or determinable, and collection of the amounts are reasonably assured. Revenues for our Distribution Solutions segment include large volume sales of pharmaceuticals primarily to a limited number of large customers who warehouse their own products. We order bulk product from the manufacturer, receive and process the product primarily through our central distribution facility and deliver the bulk product (generally in the same form as received from the manufacturer) directly to our customers’ warehouses. We also record revenues for direct store deliveries of shipments from the manufacturer to our customers. We assume the primary liability to the manufacturer for these products. Revenues are recorded gross when we are the primary party obligated in the transaction, take title to and possession of the inventory, are subject to inventory risk, have latitude in establishing prices, assume the risk of loss for collection from customers as well as delivery or return of the product, are responsible for fulfillment and other customer service requirements, or the transactions have several but not all of these indicators. Revenues are recorded net of sales returns, allowances, rebates and other incentives. Our sales return policy generally allows customers to return products only if they can be resold for value or returned to suppliers for credit. Sales returns are accrued based on estimates at the time of sale to the customer. Sales returns from customers were approximately $3.1 billion in 2017 and 2016 and $2.7 billion in 2015. We collect taxes from customers and remit to governmental authorities. We report all revenues net of taxes assessed by governmental authorities. Our Distribution Solutions segment also engages in multiple-element arrangements, which may contain a combination of various products and services. Revenue from a multiple-element arrangement is allocated to the separate elements based on their relative selling price and recognized in accordance with the revenue recognition criteria applicable to each element. Relative selling price is determined based on vendor-specific objective evidence (“VSOE”) of selling price, if available, third-party evidence (“TPE”), if VSOE of selling price is not available, or estimated selling price (“ESP”), if neither VSOE of selling price nor TPE is available. Technology Solutions Revenues for our Technology Solutions segment are generated primarily by licensing software and software systems consisting of software, hardware and maintenance support, providing software as a service (“Saas”) or SaaS-based solutions and providing claims processing, outsourcing and professional services. Revenue for this segment is recognized as follows: Software systems are marketed under information systems agreements as well as service agreements. Perpetual software arrangements are recognized at the time of delivery or under the percentage-of-completion method if the arrangements require significant production, modification or customization of the software. Contracts accounted for under the percentage-of-completion method are generally measured based on the ratio of labor hours incurred to date to total estimated labor hours to be incurred. Changes in estimates to complete and revisions in overall profit estimates on these contracts are charged to earnings in the period in which they are determined. We accrue for contract losses if and when the current estimate of total contract costs exceeds total contract revenue. Revenue from time-based software license agreements is recognized ratably over the term of the agreement. Software implementation fees are recognized as the work is performed or under the percentage-of-completion method. Maintenance and support agreements are marketed under annual or multi-year agreements and are recognized ratably over the period covered by the agreements. Hardware revenues are generally recognized upon delivery. SaaS-based subscription, content and transaction processing fees are generally marketed under annual and multi-year agreements and are recognized ratably over the contracted terms beginning on the service start date for fixed fee arrangements and recognized as transactions are performed beginning on the service start date for per-transaction fee arrangements. Remote processing service fees are recognized monthly as the service is performed. Outsourcing service revenues are recognized as the service is performed. We also offer certain products on an application service provider basis, making our software functionality available on a remote hosting basis from our data centers. The data centers provide system and administrative support, as well as hosting services. Revenue on products sold on an application service provider basis is recognized on a monthly basis over the term of the contract beginning on the service start date of products hosted. This segment engages in multiple-element arrangements, which may contain any combination of software, hardware, implementation, SaaS-based offerings, consulting services or maintenance services. For multiple-element arrangements that do not include software, revenue is allocated to the separate elements based on their relative selling price and recognized in accordance with the revenue recognition criteria applicable to each element. Relative selling price is determined based on VSOE of selling price if available, TPE, if VSOE of selling price is not available, or ESP if neither VSOE of selling price nor TPE is available. For multiple-element arrangements accounted for in accordance with specific software accounting guidance when some elements are delivered prior to others in an arrangement and VSOE of fair value exists for the undelivered elements, revenue for the delivered elements is recognized upon delivery of such items. The segment establishes VSOE for hardware and implementation and consulting services based on the price charged when sold separately, and for maintenance services, based on renewal rates offered to customers. Revenue for the software element is recognized under the residual method only when fair value has been established for all of the undelivered elements in an arrangement. If fair value cannot be established for any undelivered element, all of the arrangement’s revenue is deferred until the delivery of the last element or until the fair value of the undelivered element is determinable. For multiple-element arrangements with both software elements and nonsoftware elements, arrangement consideration is allocated between the software elements as a whole and nonsoftware elements. The segment then further allocates consideration to the individual elements within the software group, and revenue is recognized for all elements under the applicable accounting guidance and our policies described above.
Supplier Incentives	Supplier Incentives: Fees for service and other incentives received from suppliers, relating to the purchase or distribution of inventory, are generally reported as a reduction to cost of sales. We consider these fees and other incentives to represent product discounts and as a result, the amounts are recognized within cost of sales upon the sale of the related inventory.
Supplier Reserves	Supplier Reserves: We establish reserves against amounts due from suppliers relating to various fees for services and price and rebate incentives, including deductions taken against payments otherwise due to them. These reserve estimates are established based on judgment after considering the status of current outstanding claims, historical experience with the suppliers, the specific incentive programs and any other pertinent information available. We evaluate the amounts due from suppliers on a continual basis and adjust the reserve estimates when appropriate based on changes in factual circumstances. All adjustments to supplier reserves are included in cost of sales. The ultimate outcome of any outstanding claims may be different than our estimate.
Income Taxes	Income Taxes: We account for income taxes under the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements or the tax returns. Under this method, deferred tax assets and liabilities are determined based on the difference between the financial statements and the tax basis of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. Tax benefits from uncertain tax positions are recognized when it is more likely than not that the position will be sustained upon examination, including resolutions of any related appeals or litigation processes, based on the technical merits. The amount recognized is measured as the largest amount of tax benefit that is greater than 50 percent likely of being realized upon effective settlement. Deferred taxes are not provided on undistributed earnings of our foreign operations that are considered to be permanently reinvested.
Foreign Currency Translation	Foreign Currency Translation: The reporting currency of the Company and its subsidiaries is the U.S. dollar. Our foreign subsidiaries generally consider their local currency to be their functional currency. Foreign currency-denominated assets and liabilities of these foreign subsidiaries are translated into U.S. dollars at year-end exchange rates and revenues and expenses are translated at average exchange rates during the corresponding period, and stockholders’ equity accounts are primarily translated at historical exchange rates. Foreign currency translation adjustments are included in other comprehensive income or loss in the statements of consolidated comprehensive income, and the cumulative effect is included in the stockholders’ equity section of the consolidated balance sheets. Realized gains and losses from currency exchange transactions are recorded in operating expenses in the consolidated statements of operations and were not material to our consolidated results of operations in 2017, 2016 or 2015. We release cumulative translation adjustment from stockholders’ equity into net income as a gain or loss only upon complete or substantially complete liquidation of a controlling interest in a subsidiary or a group of assets within a foreign entity. We also release all or a pro rata portion of the cumulative translation adjustment into net income upon the sale of an equity method investment that is a foreign entity.
Derivative Financial Instruments	Derivative Financial Instruments: Derivative financial instruments are used principally in the management of foreign currency exchange and interest rate exposures and are recorded on the consolidated balance sheets at fair value. If a derivative is designated as a fair value hedge, the changes in the fair value of the derivative and of the hedged item attributable to the hedged risk are recognized as a charge or credit to earnings. We use foreign currency-denominated notes to hedge our net investment in our foreign subsidiaries. If the financial instrument is designated as a cash flow hedge or net investment hedge, the effective portions of changes in the fair value of the derivative are included in other comprehensive income or loss in the statements of consolidated comprehensive income, and the cumulative effect is included in the stockholders’ equity section of the consolidated balance sheets. The cumulative changes in fair value are reclassified to the consolidated statements of operations when the hedged item affects earnings. We periodically evaluate hedge effectiveness, and ineffective portions of changes in the fair value of cash flow hedges and net investment hedges are recognized as a charge or credit to earnings. Derivative instruments not designated as hedges are marked-to-market at the end of each accounting period with the change included in earnings.
Comprehensive Income	Comprehensive Income: Comprehensive income consists of two components, net income and other comprehensive income. Other comprehensive income refers to revenue, expenses, and gains and losses that under GAAP are recorded as an element of stockholders’ equity but are excluded from net income. Our other comprehensive income primarily consists of foreign currency translation adjustments from those subsidiaries where the local currency is the functional currency, unrealized gains and losses on cash flow hedges and net investment hedges, as well as unrealized gains and losses on retirement-related benefit plans.
Noncontrolling Interests and Redeemable Noncontrolling Interests	Noncontrolling Interests and Redeemable Noncontrolling Interests: Noncontrolling interests represent the portion of profit or loss, net assets and comprehensive income that is not allocable to McKesson Corporation. In 2017, 2016 and 2015, net income attributable to noncontrolling interests included guaranteed dividends or recurring compensation that McKesson is obligated to pay to the noncontrolling shareholders of Celesio AG (“Celesio”) under the profit and loss transfer agreement. In 2017, net income attributable to noncontrolling interests also included third-party equity interests in our consolidated entities including Vantage Oncology Holdings, LLC (“Vantage”) and ClarusOne Sourcing Services LLC, which was established between McKesson and Wal-Mart Stores, Inc. Noncontrolling interests with redemption features, such as put rights, that are not solely within the Company’s control are considered redeemable noncontrolling interests. Redeemable noncontrolling interests are presented outside of Stockholders’ Equity on our consolidated balance sheet. Refer to Financial Note 11, “Redeemable Noncontrolling Interests and Noncontrolling Interests,” for more information.
Share-Based Compensation	Share-Based Compensation: We account for all share-based compensation transactions using a fair-value based measurement method. The share-based compensation expense, for the portion of the awards that is ultimately expected to vest, is recognized on a straight-line basis over the requisite service period. The compensation expense recognized has been classified in the consolidated statements of operations or capitalized on the consolidated balance sheets in the same manner as cash compensation paid to our employees.
Loss Contingencies	Loss Contingencies: We are subject to various claims, including claims with customers and vendors, pending and potential legal actions for damages, investigations relating to governmental laws and regulations and other matters arising out of the normal conduct of our business. When a loss is considered probable and reasonably estimable, we record a liability in the amount of our best estimate for the ultimate loss. However, the likelihood of a loss with respect to a particular contingency is often difficult to predict and determining a meaningful estimate of the loss or a range of loss may not be practicable based on the information available and the potential effect of future events and decisions by third parties that will determine the ultimate resolution of the contingency. Moreover, it is not uncommon for such matters to be resolved over many years, during which time relevant developments and new information must be reevaluated at least quarterly to determine both the likelihood of potential loss and whether it is possible to reasonably estimate a range of possible loss. When a material loss is probable but a reasonable estimate cannot be made, disclosure of the proceeding is provided. Disclosure is also provided when it is reasonably possible that a material loss will be incurred or when it is reasonably possible that the amount of a loss will exceed the recorded provision. We review all contingencies at least quarterly to determine whether the likelihood of loss has changed and to assess whether a reasonable estimate of the loss or range of the loss can be made. As discussed above, development of a meaningful estimate of loss or a range of potential loss is complex when the outcome is directly dependent on negotiations with or decisions by third parties, such as regulatory agencies, the court system and other interested parties. Such factors bear directly on whether it is possible to reasonably estimate a range of potential loss and boundaries of high and low estimate.
Business Combinations	Business Combinations: We account for acquired businesses using the acquisition method of accounting, which requires that once control of a business is obtained, 100% of the assets acquired and liabilities assumed, including amounts attributed to noncontrolling interests, be recorded at the date of acquisition at their respective fair values. Any excess of the purchase price over the estimated fair values of the net assets acquired is recorded as goodwill. Acquisition-related expenses and related restructuring costs are expensed as incurred. Several valuation methods may be used to determine the fair value of assets acquired and liabilities assumed. For intangible assets, we typically use the income method. This method starts with a forecast of all of the expected future net cash flows for each asset. These cash flows are then adjusted to present value by applying an appropriate discount rate that reflects the risk factors associated with the cash flow streams. Some of the more significant estimates and assumptions inherent in the income method or other methods include the amount and timing of projected future cash flows, the discount rate selected to measure the risks inherent in the future cash flows and the assessment of the asset’s life cycle and the competitive trends impacting the asset, including consideration of any technical, legal, regulatory, or economic barriers to entry. Determining the useful life of an intangible asset also requires judgment as different types of intangible assets will have different useful lives and certain assets may even be considered to have indefinite useful lives.
Recently Adopted Accounting Pronouncements and Recently Issued Accounting Pronouncements Not Yet Adopted	Recently Adopted Accounting Pronouncements Share-Based Payments: In March 2016, amended guidance was issued for employee share-based payment awards. Under the amended guidance, all excess tax benefits (“windfalls”) and deficiencies (“shortfalls”) related to employee share-based compensation arrangements are recognized within income tax expense. Under the previous guidance, windfalls were recognized in additional paid-in capital (“APIC”) and shortfalls were only recognized to the extent they exceeded the pool of windfall tax benefits. The amended guidance also requires excess tax benefits to be classified as an operating activity in the statement of cash flows, rather than a financing activity. The amended guidance is effective for us commencing in the first quarter of 2018. Early adoption is permitted. We elected to early adopt this amended guidance in the first quarter of 2017. The primary impact of the adoption was the recognition of excess tax benefits in the income statement on a prospective basis, rather than APIC. As a result, discrete tax benefits of $54 million were recognized in income tax expense in 2017. We also elected to adopt the cash flow presentation of the excess tax benefits prospectively commencing in the first quarter of 2017. None of the other provisions in this amended guidance had a material impact on our consolidated financial statements. Business Combinations: In the first quarter of 2017, we adopted amended guidance for an acquirer’s accounting for measurement-period adjustments. The amended guidance eliminates the requirement that an acquirer in a business combination account for measurement-period adjustments retrospectively and instead requires that measurement-period adjustments be recognized during the period in which it determines the adjustment. In addition, the amended guidance requires that the acquirer record, in the same period’s financial statements, the effect on earnings of changes in depreciation, amortization, or other income effects, if any, as a result of the change to the provisional amounts, calculated as if the accounting had been completed at the acquisition date. The adoption of this amended guidance did not have a material effect on our consolidated financial statements. Fair Value Measurement: In the first quarter of 2017, we adopted amended fair value guidance on a retrospective basis. This amended guidance limits disclosures and removes the requirement to categorize investments within the fair value hierarchy if the fair value of the investment is measured using the net asset value (“NAV”) per share practical expedient. The amended guidance primarily affected our fiscal 2017 annual disclosures related to our pension benefits. Refer to Financial Note 19, “Pension Benefits,” for more information regarding the impact of this amended guidance on our pension benefits. The adoption of this amended guidance did not have a material effect on our consolidated financial statements. Fees Paid in a Cloud Computing Arrangement: In the first quarter of 2017, we adopted amended guidance for a customer’s accounting for fees paid in a cloud computing arrangement. The amended guidance requires customers to determine whether or not an arrangement contains a software license element. If the arrangement contains a software element, the related fees paid should be accounted for as an acquisition of a software license. If the arrangement does not contain a software license, it is accounted for as a service contract. The adoption of this amended guidance did not have a material effect on our consolidated financial statements. Debt Issuance Costs: In the first quarter of 2017, we adopted amended guidance for the balance sheet presentation of debt issuance costs on a retrospective basis. The amended guidance requires debt issuance costs related to a recognized debt liability to be reported on the balance sheet as a direct deduction from the carrying amount of that debt liability. The recognition and measurement guidance for debt issuance costs are not affected by the amended guidance. In August 2015, a clarification was added to this amended guidance that debt issuance costs related to line-of-credit arrangements can continue to be deferred and presented as an asset on the balance sheet. Upon adoption, unamortized debt issuance costs of $40 million were reclassified primarily from other noncurrent assets to long-term debt at March 31, 2016. Consolidation: In the first quarter of 2017, we adopted amended guidance for consolidating legal entities in which a reporting entity holds a variable interest. The amended guidance modifies the evaluation of whether limited partnerships and similar legal entities are VIEs and changes the consolidation analysis of reporting entities that are involved with VIEs that have fee arrangements and related party relationships. The adoption of this amended guidance did not have a material effect on our consolidated financial statements. Deferred Income Taxes: In November 2015, amended guidance was issued for the balance sheet classification of deferred income taxes. The amended guidance requires the classification of all deferred tax assets and liabilities as noncurrent on the balance sheet instead of separating deferred taxes into current and noncurrent amounts. The amended guidance would have been effective for us commencing in the first quarter of 2018, however, early adoption was permitted. We early adopted this amended guidance in the fourth quarter of 2016 on a prospective basis. As a result, we reclassified current net deferred tax liabilities of approximately $2 billion on our consolidated balance sheet as of March 31, 2016. The adoption of this guidance had no impact on our consolidated statements of earnings, comprehensive income or cash flows. This amended guidance only resulted in a change in presentation of our deferred income taxes on our consolidated balance sheet as of March 31, 2016. Discontinued Operations: In the first quarter of 2016, we adopted amended guidance for reporting of discontinued operations and disclosures of disposals of components. The amended guidance revises the criteria for disposals to qualify as discontinued operations and permits significant continuing involvement and continuing cash flows with the discontinued operation. In addition, the amended guidance requires additional disclosures for discontinued operations and new disclosures for individually material disposal transactions that do not meet the definition of a discontinued operation. Refer to Financial Note 7, “Divestiture of Businesses,” for more information regarding the impact of this amended guidance on our consolidated financial statements. Cumulative Translation Adjustment: In the first quarter of 2015, we adopted amended guidance for a parent’s accounting for the cumulative translation adjustment upon derecognition of certain subsidiaries or group of assets within a foreign entity or of an investment in a foreign entity. The amended guidance requires the release of any cumulative translation adjustment into net income only upon complete or substantially complete liquidation of a controlling interest in a subsidiary or a group of assets within a foreign entity. Also, it requires the release of all or a pro rata portion of the cumulative translation adjustment to net income in the case of sale of an equity method investment that is a foreign entity. The adoption of this amended guidance did not have a material effect on our consolidated financial statements. Recently Issued Accounting Pronouncements Not Yet Adopted Share-Based Payments: In May 2017, amended guidance was issued for employee share-based payment awards. This amendment provides guidance on which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting. Under the amended guidance, we are required to account for the effects of a modification if the fair value, the vesting conditions or the classification (as an equity instrument or a liability instrument) of the modified award change from that of the original award immediately before the modification. The amended guidance is effective for us on a prospective basis commencing in the first quarter of 2019. Early adoption is permitted. We are currently evaluating the impact of this amended guidance on our consolidated financial statements. Premium Amortization of Purchased Callable Debt Securities: In March 2017, amended guidance was issued to shorten the amortization period for certain callable debt securities held at a premium. The amended guidance requires that the premium of callable debt securities to be amortized to the earliest call date but does not require an accounting change for securities held at a discount as they would still be amortized to maturity. The amended guidance is effective for us on a modified retrospective basis commencing in the first quarter of 2020. Early adoption is permitted. We are currently evaluating the impact of this amended guidance on our consolidated financial statements. Compensation - Retirement Benefits: In March 2017, amended guidance was issued which requires us to report the service cost component of defined benefit pension plans and other postretirement plans in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. Other components of net benefit cost are required to be presented in the statements of operations separately from the service cost component. This amended guidance is effective for us in the first quarter of 2019 on a retrospective basis. Early adoption is permitted. We are currently evaluating the impact of this amended guidance on our consolidated financial statements. Derecognition of Nonfinancial Assets: In February 2017, amended guidance was issued that defines the term “in substance nonfinancial asset” as a financial asset promised to a counterparty in a contract if substantially all of the fair value of the asset that is promised is concentrated in nonfinancial assets. The scope of this amendment includes nonfinancial assets transferred within a legal entity including a parent entity’s transfer of nonfinancial assets by transferring ownership interests in consolidated subsidiaries. The amendment excludes all businesses and nonprofit activities from its scope and therefore all entities, with limited exceptions, are required to account for the derecognition of a business or nonprofit activity in accordance with the consolidation guidance once this amended guidance becomes effective. We are required to apply this amended guidance at the same time we apply the amended revenue guidance in the first quarter of 2019. It allows for either full retrospective adoption or modified retrospective adoption. Early adoption is permitted but not prior to our first quarter of 2018. We are currently evaluating the impact of this amended guidance on our consolidated financial statements. Goodwill Impairment Testing: In January 2017, amended guidance was issued to simplify goodwill impairment testing by eliminating the second step of the impairment test as previously described. The amended guidance requires a one-step impairment test in which an entity compares the fair value of a reporting unit with its carrying amount and recognizes an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value, if any. The amended guidance is effective for us on a prospective basis commencing in the first quarter of 2021. Early adoption is permitted. We are currently evaluating the impact of this amended guidance on our consolidated financial statements. Business Combinations: In January 2017, amended guidance was issued to clarify the definition of a business to assist entities in evaluating whether transactions should be accounted for as acquisitions of assets or businesses. The amended guidance provides a practical screen to determine when an integrated set of assets and activities (collectively referred to as a “set”) is not a business. The screen requires that when substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets, the set is not a business. If the screen is not met, the amended guidance requires that to be considered a business, a set must include an input and a substantive process that together significantly contribute to the ability to create output. The amended guidance is effective for us commencing in the first quarter of 2019 on a prospective basis. Early adoption is permitted in certain circumstances. We are currently evaluating the impact of this amended guidance on our condensed consolidated financial statements. Restricted Cash: In November 2016, amended guidance was issued that requires restricted cash and restricted cash equivalents to be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total cash amounts shown on the statement of cash flows. Transfers between cash and cash equivalents and restricted cash or restricted cash equivalents are not reported as cash flow activities in the statement of cash flows. The amended guidance is effective for us commencing in the first quarter of 2019 on a retrospective basis. Early adoption is permitted. We are currently evaluating the impact of this amended guidance on our consolidated financial statements. Consolidation: In October 2016, amended guidance was issued that requires a single decision maker of a VIE to consider indirect economic interests in the entity held through related parties that are under common control on a proportionate basis when determining whether it is the primary beneficiary of that VIE. This amendment does not change the existing characteristics of a primary beneficiary. The amended guidance becomes effective for us commencing in the first quarter of 2018 on a retrospective basis. Early adoption is permitted. We do not expect the adoption of this amended guidance to have a material effect on our consolidated financial statements. Income Taxes - Intra-Entity Transfers of Assets Other Than Inventory: In October 2016, amended guidance was issued to require entities to recognize income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. The amended guidance is effective for us commencing in the first quarter of 2019 on a modified retrospective basis. Early adoption is permitted. We are currently evaluating the impact of this amended guidance on our consolidated financial statements. Statement of Cash Flows - Classification of Certain Cash Receipts and Cash Payments: In August 2016, amended guidance was issued to provide clarification on cash flow classification related to eight specific issues including contingent consideration payments made after a business combination and distributions received from equity method investees. The amended guidance is effective for us commencing in the first quarter of 2019 on a retrospective basis. Early adoption is permitted. We are currently evaluating the impact of this amended guidance on our consolidated financial statements. Financial Instruments - Credit Losses: In June 2016, amended guidance was issued, which will change the impairment model for most financial assets and require additional disclosures. The amended guidance requires financial assets that are measured at amortized cost, be presented at the net amount expected to be collected. The allowance for credit losses is a valuation account that is deducted from the amortized cost basis of the financial assets. The amended guidance also requires us to consider historical experience, current conditions, and reasonable and supportable forecasts that affect the collectibility of the reported amount in estimating credit losses. The amended guidance becomes effective for us commencing in 2021 and will be applied through a cumulative-effect adjustment to the beginning retained earnings in the year of adoption. Early adoption is permitted. We are currently evaluating the impact of this amended guidance on our consolidated financial statements. Investments: In March 2016, amended guidance was issued to simplify the transition to the equity method of accounting. This standard eliminates the requirement that when an existing cost method investment qualifies for use of the equity method, an investor must restate its historical financial statements, as if the equity method had been used during all previous periods. Additionally, at the point an investment qualifies for the equity method, any unrealized gain or loss in accumulated other comprehensive income (loss) will be recognized through earnings. The amended guidance is effective for us prospectively commencing in the first quarter of 2018. Early adoption is permitted. We do not expect the adoption of this amended guidance to have a material effect on our consolidated financial statements. Derivatives and Hedging: In March 2016, amended guidance was issued for derivative instrument novations. The amendments clarify that a novation, a change in the counterparty, to a derivative instrument that has been designated as a hedging instrument does not, in and of itself, require dedesignation of that hedging relationships provided all other hedge accounting criteria continue to be met. The amended guidance is effective for us commencing in the first quarter of 2018. The amended guidance allows for either prospective or modified retrospective adoption. Early adoption is permitted. We do not expect the adoption of this amended guidance to have a material effect on our consolidated financial statements. Leases: In February 2016, amended guidance was issued for lease arrangements. The amended standard will require lessees to recognize assets and liabilities on the balance sheet for all leases with terms longer than 12 months and provide enhanced disclosures on key information of leasing arrangements. The amended guidance is effective for us commencing in the first quarter of 2020, on a modified retrospective basis. Early adoption is permitted. We plan to adopt the new standard on the effective date and are currently evaluating the impact of this amended guidance on our consolidated financial statements. We anticipate that the adoption of the amended lease guidance will materially affect our consolidated balance sheets and will require certain changes to our systems and processes. Financial Instruments: In January 2016, amended guidance was issued that requires equity investments to be measured at fair value with changes in fair value recognized in net income and enhanced disclosures about those investments. This guidance also simplifies the impairment assessments of equity investments without readily determinable fair value. The investments that are accounted for under the equity method of accounting or result in consolidation of the investee are excluded from the scope of this amended guidance. The amended guidance will become effective for us commencing in the first quarter of 2019 and will be adopted through a cumulative-effect adjustment. Early adoption is not permitted except for certain provisions. We are currently evaluating the impact of this amended guidance on our consolidated financial statements. Inventory: In July 2015, amended guidance was issued for the subsequent measurement of inventory. The amended guidance requires entities to measure inventory at the lower of cost or net realizable value. Net realizable value is the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal, and transportation. The requirement would replace the current lower of cost or market evaluation. Accounting guidance is unchanged for inventory measured using last-in, first-out (“LIFO”) or the retail method. The amended guidance will become effective for us commencing in the first quarter of 2018. Early adoption is permitted. We do not expect the adoption of this amended guidance to have a material effect on our consolidated financial statements. Revenue Recognition: In May 2014, amended guidance was issued for recognizing revenue from contracts with customers. The amended guidance eliminates industry specific guidance and applies to all companies. Revenues will be recognized when an entity satisfies a performance obligation by transferring control of a promised good or service to a customer in an amount that reflects the consideration to which the entity expects to be entitled for that good or service. Revenue from a contract that contains multiple performance obligations is allocated to each performance obligation generally on a relative standalone selling price basis. The amended guidance also requires additional quantitative and qualitative disclosures. In March, April and May 2016, amended guidance was further issued including clarifying guidance on principal versus agent considerations, ability to choose an accounting policy election to account for shipping and handling activities that occur after the customer has obtained control of a good as an activity to fulfill the promise to transfer the good, and provided certain scope improvements and practical expedients. The amended standard is effective for us commencing in the first quarter of 2019 and allows for either full retrospective adoption or modified retrospective adoption. Early adoption is permitted but not prior to our first quarter of 2018. While we continue to evaluate the effect of the amended standard, we have conducted a preliminary assessment for our Distribution Solutions segment and do not expect adoption of the amended standard to have a material impact to our consolidated financial statements. We generally anticipate having substantially similar performance obligations under the amended guidance as compared with deliverables and units of account currently being recognized. We intend to make policy elections within the amended standard that are consistent with our current accounting. Our preliminary assessment does not include certain businesses for which we are exploring strategic alternatives and we continue to evaluate the potential impact of the recent acquisitions. This preliminary assessment is subject to change prior to adoption. Additionally, we anticipate adopting this amended standard on a modified retrospective basis in our first quarter of 2019.