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Commitments and Contingent Liabilities - Estimated Accrual Liability (Details) - National Prescription Opioid Litigation - USD ($) $ in Millions | Sep. 30, 2023 | Mar. 31, 2023
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Loss Contingencies [Line Items] |  |
Current litigation liabilities | $ 516 | $ 548
Long-term litigation liabilities | 6,128 | 6,625
Total litigation liabilities | $ 6,644 | $ 7,173

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