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Segments of Business (Details) $ in Millions, $ in Millions |  | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
May 23, 2018 USD ($) | May 23, 2018 CAD ($) | Dec. 31, 2018 USD ($) country | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2017 CAD ($) | Dec. 31, 2018 USD ($) segment country | Dec. 31, 2017 USD ($)
Revenues |  |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  | $ 56,208 |  |  | $ 53,617 |  |  |  |  | $ 161,890 | $ 156,729
Operating profit (8) |  |  |  |  |  |  |  |  |  |  |  |
Total operating profit |  |  | 683 |  |  | 834 |  |  |  |  | 1,455 | 1,706
Corporate Expenses, Net |  |  | (190) |  |  | (120) |  |  |  |  | (480) | (337)
Interest Expense |  |  | (67) |  |  | (67) |  |  |  |  | (194) | (204)
Income from Continuing Operations Before Income Taxes |  |  | 650 |  |  | 697 |  |  |  |  | $ 1,243 | 1,333
Number of reportable segments | segment |  |  |  |  |  |  |  |  |  |  | 3 |
Pre-tax credits related to LIFO accounting |  |  |  |  |  |  |  |  |  |  | $ 64 | 5
Proceeds from legal settlements |  |  | 104 |  |  |  |  |  |  |  | 139 |
Pretax charge related to customer bankruptcy |  |  | 60 |  |  |  |  |  |  |  | 60 |
Pretax goodwill impairment charges |  |  | 21 |  |  | 0 |  |  |  |  | 591 | 350
Goodwill and other asset impairment charges |  |  |  |  |  |  |  |  |  |  | 671 | 539
Pre-tax restructuring and asset impairment charges |  |  | 110 |  |  | 6 |  |  |  |  | 288 | 242
After-tax restructuring and asset impairment charges |  |  | 92 |  |  | 5 |  |  |  |  | 244 | 202
Gain from sale of business, pre-tax |  |  | 0 |  |  | 109 |  |  |  |  | 0 | 109
Net income (loss) from Change Healthcare |  |  | (50) |  |  | (90) |  |  |  |  | $ (162) | (271)
U.S. Pharmaceutical and Specialty Solutions |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (8) |  |  |  |  |  |  |  |  |  |  |  |
Revenue derived from services, percentage (less than) |  |  |  |  |  |  |  |  |  |  | 1.00% |
Pre-tax credits related to LIFO accounting |  |  | $ 21 |  |  | 2 |  |  |  |  | $ 64 | 5
Pre-tax gain on sale of equity method investments |  |  |  |  |  | 43 |  |  |  |  |  | 43
After-tax gain on sale of equity method investments |  |  |  |  |  | 26 |  |  |  |  |  | 26
Pretax goodwill impairment charges |  |  |  |  |  |  |  |  |  |  | $ 0 |
European Pharmaceutical Solutions |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (8) |  |  |  |  |  |  |  |  |  |  |  |
Number of countries in which entity segment operates | country |  |  | 13 |  |  |  |  |  |  |  | 13 |
Revenue derived from services, percentage (less than) |  |  |  |  |  |  |  |  |  |  | 10.00% |
Pretax goodwill impairment charges |  |  |  |  | $ 570 |  |  |  |  |  | $ 570 |
After-tax goodwill impairment |  |  |  |  | $ 570 |  |  |  |  |  |  |
Medical-Surgical Solutions |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (8) |  |  |  |  |  |  |  |  |  |  |  |
Revenue derived from services, percentage (less than) |  |  |  |  |  |  |  |  |  |  | 1.00% |
Pretax goodwill impairment charges |  |  |  |  |  |  |  |  |  |  | $ 0 |
Other |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (8) |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain on sale of equity method investments |  |  | $ 56 |  |  |  |  |  |  |  | 56 |
After-tax gain on sale of equity method investments |  |  | 41 |  |  |  |  |  |  |  | 41 |
Pretax goodwill impairment charges |  |  |  |  |  |  |  |  |  |  | 21 |
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  | 56,208 |  |  | 53,617 |  |  |  |  | 161,890 | 156,729
Operating profit (8) |  |  |  |  |  |  |  |  |  |  |  |
Total operating profit |  |  | $ 907 |  |  | $ 884 |  |  |  |  | 1,917 | $ 1,874
Revenue derived from services, percentage (less than) |  |  | 1.00% |  |  | 1.00% |  |  |  |  |  | 1.00%
Operating Segments | U.S. Pharmaceutical and Specialty Solutions |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  | $ 44,279 |  |  | $ 41,969 |  |  |  |  | 126,866 | $ 122,854
Operating profit (8) |  |  |  |  |  |  |  |  |  |  |  |
Total operating profit |  |  | 671 |  |  | 565 |  |  |  |  | 1,824 | 1,750
Operating Segments | European Pharmaceutical Solutions |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  | 6,911 |  |  | 6,989 |  |  |  |  | 20,485 | 20,144
Operating profit (8) |  |  |  |  |  |  |  |  |  |  |  |
Total operating profit |  |  | $ 26 |  |  | $ 16 |  |  |  |  | (524) | $ (496)
Revenue derived from services, percentage (less than) |  |  | 10.00% |  |  | 10.00% |  |  |  |  |  | 10.00%
Pretax goodwill impairment charges |  |  |  |  |  |  |  |  |  |  | 570 |
After-tax goodwill impairment |  |  |  |  |  |  |  |  |  |  | 570 |
Pre-tax restructuring and asset impairment charges |  |  |  |  |  |  |  |  |  |  |  | $ 242
After-tax restructuring and asset impairment charges |  |  |  |  |  |  |  |  |  |  |  | 202
Operating Segments | Medical-Surgical Solutions |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  | $ 2,012 |  |  | $ 1,693 |  |  |  |  | 5,663 | 4,886
Operating profit (8) |  |  |  |  |  |  |  |  |  |  |  |
Total operating profit |  |  | $ 136 |  |  | $ 123 |  |  |  |  | 334 | $ 349
Revenue derived from services, percentage (less than) |  |  | 1.00% |  |  | 1.00% |  |  |  |  |  | 1.00%
Operating Segments | Other |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  | $ 3,006 |  |  | $ 2,966 |  |  |  |  | 8,876 | $ 8,845
Operating profit (8) |  |  |  |  |  |  |  |  |  |  |  |
Total operating profit |  |  | 74 |  |  | 180 |  |  |  |  | 283 | 271
Gain (credit) on derecognition of liability, pre-tax |  |  |  |  |  | (46) |  |  |  |  |  | (46)
Gain (credit) on derecognition of liability, after tax |  |  |  |  |  | (30) |  |  |  |  |  | (30)
Joint Venture | Change Healthcare, LLC (“Change Healthcare”) |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (8) |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in the joint venture (percent) |  |  |  |  |  |  |  | 70.00% |  |  |  |
Gain (credit) on derecognition of liability, pre-tax |  |  |  |  |  |  |  |  |  |  | 90 |
Gain (credit) on derecognition of liability, after tax |  |  |  |  |  |  |  |  |  |  | 66 |
Net income (loss) from Change Healthcare |  |  | $ (50) |  |  | (90) |  |  |  |  | $ (162) | (271)
Core MTS Businesses | Change Healthcare, LLC (“Change Healthcare”) | Operating Segments | Other |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (8) |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain on sale of equity method investments |  |  |  |  |  |  |  |  |  |  |  | 37
After-tax gain on sale of equity method investments |  |  |  |  |  |  |  |  |  |  |  | 22
Gain from sale of business, pre-tax |  |  |  |  |  |  | $ 37 | $ 3,900 |  |  |  |
Gain from sale of business, after tax |  |  |  |  |  |  | $ 22 | $ 3,000 |  |  |  |
Core MTS Businesses | Joint Venture |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (8) |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in the joint venture (percent) |  |  | 70.00% |  |  |  |  |  |  |  | 70.00% |
Enterprise Information Solutions |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (8) |  |  |  |  |  |  |  |  |  |  |  |
Gain from sale of business, pre-tax |  |  |  |  |  | 109 |  |  |  |  |  |
Gain from sale of business, after tax |  |  |  |  |  | 30 |  |  |  |  |  |
Enterprise Information Solutions | Operating Segments | Other |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (8) |  |  |  |  |  |  |  |  |  |  |  |
Gain from sale of business, pre-tax |  |  |  |  |  | 109 |  |  |  |  |  | 109
Gain from sale of business, after tax |  |  |  |  |  | 30 |  |  |  |  |  | 30
CANADA | Other |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (8) |  |  |  |  |  |  |  |  |  |  |  |
Net restructuring charges recognized |  |  |  |  |  |  |  |  |  |  | $ 89 |
Net restructuring charges recognized, after tax |  |  |  |  |  |  |  |  |  |  | 83 |
United States |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  | $ 46,523 |  |  | 43,849 |  |  |  |  | 133,186 | 128,517
Foreign |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  | 9,685 |  |  | $ 9,768 |  |  |  |  | 28,704 | 28,212
Third Party Seller of Rexall Health | Rexall Health | CANADA |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (8) |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from prior acquisitions | $ 97 | $ 125 |  |  |  |  |  |  | $ 119 | $ 147 | 97 |
Strategic Growth Initiative Plan |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (8) |  |  |  |  |  |  |  |  |  |  |  |
Net restructuring charges recognized |  |  | 50 |  |  |  |  |  |  |  | 161 |
Strategic Growth Initiative Plan | Operating Segments | U.S. Pharmaceutical and Specialty Solutions |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (8) |  |  |  |  |  |  |  |  |  |  |  |
Net restructuring charges recognized |  |  | 4 |  |  |  |  |  |  |  | 17 |
Strategic Growth Initiative Plan | Operating Segments | Medical-Surgical Solutions |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (8) |  |  |  |  |  |  |  |  |  |  |  |
Net restructuring charges recognized |  |  | 6 |  |  |  |  |  |  |  | 24 |
Strategic Growth Initiative Plan | Operating Segments | Other |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (8) |  |  |  |  |  |  |  |  |  |  |  |
Net restructuring charges recognized |  |  | 9 |  |  |  |  |  |  |  | 89 |
Mckesson Europe Reporting Unit | Operating Segments | European Pharmaceutical Solutions |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (8) |  |  |  |  |  |  |  |  |  |  |  |
Pretax goodwill impairment charges |  |  |  |  |  |  |  |  |  |  |  | 350
After-tax goodwill impairment |  |  |  |  |  |  |  |  |  |  |  | $ 350
Rexall Health |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (8) |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and other asset impairment charges |  |  | 35 |  |  |  |  |  |  |  |  |
Rexall Health | Other |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (8) |  |  |  |  |  |  |  |  |  |  |  |
Pretax goodwill impairment charges |  |  | 21 |  |  |  |  |  |  |  |  |
Goodwill and other asset impairment charges |  |  | 56 |  |  |  |  |  |  |  | 56 |
Impairment of Goodwill and other long-lived assets, net of tax |  |  | 56 |  |  |  |  |  |  |  | 56 |
After-tax goodwill impairment |  |  | 21 |  |  |  |  |  |  |  |  |
Tax Receivable Agreement (“TRA”) | Change Healthcare, LLC (“Change Healthcare”) | Other |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (8) |  |  |  |  |  |  |  |  |  |  |  |
Gain (credit) on derecognition of liability, pre-tax |  |  |  | $ 90 |  |  |  |  |  |  |  |
Gain (credit) on derecognition of liability, after tax |  |  |  | $ 66 |  |  |  |  |  |  |  |
Severance | Strategic Growth Initiative Plan - Relocation of Corporate Headquarters |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (8) |  |  |  |  |  |  |  |  |  |  |  |
Net restructuring charges recognized |  |  | 31 |  |  |  |  |  |  |  | 31 |
Net restructuring charges recognized, after tax |  |  | $ 23 |  |  |  |  |  |  |  | $ 23 |

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