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Segments of Business - Segment Assets and Property, Plant and Equipment, Net by Geographical Area (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Mar. 31, 2020
--- | --- | ---
Segment assets |  |
Total assets | $ 65,015 | $ 61,247
Long-lived assets |  |
Total long-lived assets | 3,094 | 2,765
United States |  |
Long-lived assets |  |
Total long-lived assets | 2,110 | 1,873
Foreign |  |
Long-lived assets |  |
Total long-lived assets | 984 | 892
Operating Segments | U.S. Pharmaceutical |  |
Segment assets |  |
Total assets | 35,236 | 33,541
Operating Segments | International |  |
Segment assets |  |
Total assets | 14,987 | 14,994
Operating Segments | Medical-Surgical Solutions |  |
Segment assets |  |
Total assets | 5,986 | 5,395
Operating Segments | Prescription Technology Solutions |  |
Segment assets |  |
Total assets | 3,446 | 3,786
Corporate |  |
Segment assets |  |
Total assets | $ 5,360 | $ 3,531

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