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Business Acquisitions and Divestitures - Narrative (Details) - USD ($) $ in Millions |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 02, 2025 | Apr. 01, 2025 | Dec. 30, 2024 | Jun. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Mar. 31, 2025
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 11,283 |  | $ 10,022
Canadian businesses held for sale |  |  |  |  |  | 0 | $ 638 |
Held-for-sale | Norway Disposal Group |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Divested net assets |  |  |  |  |  | 112 |  |
Accumulated other comprehensive loss in charge for remeasurement to fair value |  |  |  |  |  | $ 171 |  |
Disposed of by sale | Canadian retail disposal group |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Divested net assets |  |  | $ 741 |  |  |  |  |
Accumulated other comprehensive loss in charge for remeasurement to fair value |  |  |  |  |  |  |  | 48
Cash proceeds from divestiture |  |  | 9 |  |  |  |  |
Noncash divestiture, amount of consideration received |  |  | $ 120 |  |  |  |  |
Noncash divestiture payable period (in years) |  |  | 6 years |  |  |  |  |
Trade accounts payable |  |  | $ 125 |  |  |  |  |
Canadian businesses held for sale |  |  |  |  | $ 643 |  | $ 643 | $ 667
PRISM Vision LLC |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Controlling interest acquired (as a percent) |  | 80.00% |  |  |  |  |  |
Cash payments to acquire business |  | $ 871 |  |  |  |  |  |
Redeemable noncontrolling interests |  | 25 |  |  |  |  |  |
Intangible assets |  | 510 |  |  |  |  |  |
Goodwill |  | $ 429 |  |  |  |  |  |
PRISM Vision LLC | Redeemable Noncontrolling Interests |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Redeemable noncontrolling interests |  |  |  | $ 25 |  |  |  |
PRISM Vision LLC | PRISM Vision Physicians |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Ownership retained (as a percent) |  | 20.00% |  |  |  |  |  |
Core Ventures |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Controlling interest acquired (as a percent) | 70.00% |  |  |  |  |  |  |
Cash payments to acquire business | $ 2,481 |  |  |  |  |  |  |
Redeemable noncontrolling interests | 700 |  |  |  |  |  |  |
Intangible assets | 2,310 |  |  |  |  |  |  |
Goodwill | $ 785 |  |  |  |  |  |  |
Core Ventures | Redeemable Noncontrolling Interests |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Redeemable noncontrolling interests |  |  |  | $ 700 |  |  |  |
Core Ventures | FCS Physicians |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Ownership retained (as a percent) | 30.00% |  |  |  |  |  |  |
Exercisable term (in years) | 5 years |  |  |  |  |  |  |
Initial fair value (as a percent) | 75.00% |  |  |  |  |  |  |

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