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Segments of Business (Details) £ in Millions, $ in Millions, $ in Millions |  |  | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 11, 2019 USD ($) | May 23, 2018 USD ($) | May 23, 2018 CAD ($) | Dec. 31, 2019 USD ($) country | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2019 USD ($) segment country | Dec. 31, 2018 USD ($) | Dec. 31, 2019 GBP (£) country | Sep. 30, 2019 GBP (£) | Mar. 31, 2019 USD ($) | Mar. 31, 2019 GBP (£) | Dec. 31, 2018 GBP (£)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt outstanding |  |  |  | $ 7,700 |  |  |  |  | $ 7,700 |  |  |  | $ 7,600 |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  | 59,172 |  |  | $ 56,208 |  | $ 172,516 | $ 161,890 |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating profit |  |  |  | 360 |  |  | 683 |  | 1,620 | 1,455 |  |  |  |  |
Corporate Expenses, Net |  |  |  | (211) |  |  | (190) |  | (750) | (480) |  |  |  |  |
Interest Expense |  |  |  | (64) |  |  | (67) |  | (184) | (194) |  |  |  |  |
Income (Loss) from Continuing Operations Before Income Taxes |  |  |  | 294 |  |  | 650 |  | (57) | 1,243 |  |  |  |  |
Pre-tax credits related to LIFO accounting |  |  |  |  |  |  |  |  | 114 | 64 |  |  |  |  |
Proceeds from legal settlements |  |  |  |  |  |  | 104 |  |  | 139 |  |  |  |  |
Pre-tax charge related to customer bankruptcy |  |  |  |  |  |  | 60 |  |  | 60 |  |  |  |  |
Goodwill and other asset impairment charges |  |  |  | 30 |  |  | 35 |  | 113 | 671 |  |  |  |  |
Asset impairment Charge, net of tax |  |  |  | 30 |  |  | 35 |  |  |  |  |  |  |  |
Pretax goodwill impairment charges |  |  |  | 2 |  |  | 21 |  | 2 | 591 |  |  |  |  |
After-tax goodwill impairment |  |  |  |  |  |  |  |  |  | 591 |  |  |  |  |
Net income (loss) from Change Healthcare |  |  |  | 28 |  |  | 50 |  | 1,478 | 162 |  |  |  |  |
Net restructuring, impairment and related charges recognized |  |  |  | 136 |  |  | 110 |  | 204 | 288 |  |  |  |  |
Net restructuring, impairment and related charges recognized, after tax |  |  |  | 115 |  |  | 92 |  | 167 | 244 |  |  |  |  |
U.S. Pharmaceutical and Specialty Solutions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax credits related to LIFO accounting |  |  |  | 66 |  |  | 21 |  | 114 | 64 |  |  |  |  |
After-tax credit related to LIFO accounting |  |  |  | $ 49 |  |  | 16 |  | 84 | 47 |  |  |  |  |
Pretax goodwill impairment charges |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
European Pharmaceutical Solutions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of countries in which entity segment operates | country |  |  |  | 13 |  |  |  |  | 13 |  | 13 |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and other asset impairment charges |  |  |  | $ 64 |  |  |  |  | $ 64 |  |  |  |  |  |
Asset impairment Charge, net of tax |  |  |  | 53 |  |  |  |  | 53 |  |  |  |  |  |
Pretax goodwill impairment charges |  |  |  |  |  |  |  |  | 0 | 570 |  |  |  |  |
After-tax goodwill impairment |  |  |  |  |  |  |  | $ 570 |  | 570 |  |  |  |  |
Medical-Surgical Solutions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pretax goodwill impairment charges |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pretax goodwill impairment charges |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  | 59,172 |  |  | 56,208 |  | 172,516 | 161,890 |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating profit |  |  |  | 569 |  |  | 907 |  | 877 | 1,917 |  |  |  |  |
Operating Segments | U.S. Pharmaceutical and Specialty Solutions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  | 46,923 |  |  | 44,279 |  | 137,067 | 126,866 |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating profit |  |  |  | $ 687 |  |  | $ 671 |  | $ 1,905 | $ 1,824 |  |  |  |  |
Revenue derived from services, percentage (less than) |  |  |  | 1.00% |  |  | 1.00% |  | 1.00% | 1.00% |  |  |  |  |
Operating Segments | European Pharmaceutical Solutions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  | $ 6,931 |  |  | $ 6,911 |  | $ 20,239 | $ 20,485 |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating profit |  |  |  | $ (303) |  |  | $ 26 |  | $ (297) | $ (524) |  |  |  |  |
Revenue derived from services, percentage (less than) |  |  |  | 10.00% |  |  | 10.00% |  | 10.00% | 10.00% |  |  |  |  |
Operating Segments | Medical-Surgical Solutions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  | $ 2,141 |  |  | $ 2,012 |  | $ 6,100 | $ 5,663 |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating profit |  |  |  | $ 124 |  |  | $ 136 |  | $ 378 | $ 334 |  |  |  |  |
Revenue derived from services, percentage (less than) |  |  |  | 2.00% |  |  | 2.00% |  | 2.00% | 2.00% |  |  |  |  |
Operating Segments | Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  | $ 3,177 |  |  | $ 3,006 |  | $ 9,110 | $ 8,876 |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating profit |  |  |  | 61 |  |  | 74 |  | (1,109) | 283 |  |  |  |  |
Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax dilution loss from reduction of ownership |  |  |  |  |  |  |  |  | (246) |  |  |  |  |  |
Pre-tax credit recognized on relief from potential future obligations |  |  |  |  |  |  |  |  |  | 90 |  |  |  |  |
After-tax credit recognized on relief from potential future obligations |  |  |  |  |  |  |  |  |  | 66 |  |  |  |  |
Joint Venture | Change Healthcare JV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax impairment charge |  |  |  |  |  |  |  |  | 1,200 |  |  |  |  |  |
After-tax impairment charge |  |  |  |  |  |  |  |  | 864 |  |  |  |  |  |
Net income (loss) from Change Healthcare |  |  |  | 28 |  |  | 50 |  | 75 | 162 |  |  |  |  |
United States |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  | 49,310 |  |  | 46,523 |  | 143,924 | 133,186 |  |  |  |  |
Foreign |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  | 9,862 |  |  | 9,685 |  | 28,592 | 28,704 |  |  |  |  |
Canada | Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net restructuring charges recognized |  |  |  |  |  |  |  |  |  | 89 |  |  |  |  |
Net restructuring charges recognized, after tax |  |  |  |  |  |  |  |  |  | 83 |  |  |  |  |
Rexall Health |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and other asset impairment charges |  |  |  |  |  |  | 56 |  | 32 | 56 |  |  |  |  |
Asset impairment Charge, net of tax |  |  |  |  |  |  | 56 |  | 32 | 56 |  |  |  |  |
Third Party Seller of Rexall Health | Rexall Health | Canada |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Escrow settlement gain, pre-tax |  | $ 97 | $ 125 |  |  |  |  |  |  | 97 |  |  |  |  |
Escrow settlement gain, net of tax |  |  |  |  |  |  |  |  |  | 97 |  |  |  |  |
United States | Pension Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax settlement expense |  |  |  |  | $ 105 | $ 17 |  |  | 122 |  |  |  |  |  |
After-tax settlement expense |  |  |  |  | $ 78 | $ 12 |  |  | 90 |  |  |  |  |  |
Related to Two Counties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax litigation and other-related expenses |  |  |  |  |  |  |  |  | 82 |  |  |  |  |  |
After-tax litigation and other-related expenses |  |  |  |  |  |  |  |  | 61 |  |  |  |  |  |
In re: National Prescription Opioid Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax litigation and other-related expenses |  |  |  | 36 |  |  |  |  | 190 |  |  |  |  |  |
Enterprise Information Solutions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain on sale of equity method investment |  |  |  |  |  |  | 56 |  |  |  |  |  |  |  |
After-tax gain on sale of equity method investment |  |  |  |  |  |  | 41 |  |  |  |  |  |  |  |
Strategic Growth Initiative Plan - Relocation of Corporate Headquarters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net restructuring, impairment and related charges recognized |  |  |  |  |  |  | 31 |  |  | 31 |  |  |  |  |
Net restructuring, impairment and related charges recognized, after tax |  |  |  |  |  |  | $ 23 |  |  | $ 23 |  |  |  |  |
Held-for-sale | German Wholesale Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss | $ 282 |  |  | 282 |  |  |  |  | 282 |  |  |  |  |  |
Impairment loss, after tax | $ 282 |  |  | $ 282 |  |  |  |  | $ 282 |  |  |  |  |  |
British Pound Sterling Denominated Notes | Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt outstanding | £ |  |  |  |  |  |  |  |  |  |  | £ 450 | £ 450 |  | £ 450 | £ 450

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