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Business Combinations - Estimated Fair Values of Aggregate Assets and Liabilities Acquired (Details) - USD ($) $ in Millions |  |  | 9 Months Ended
--- | --- | --- | ---
Aug. 01, 2025 | Jun. 10, 2025 | Sep. 30, 2025 | Sep. 30, 2024
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |  |
Cash paid |  |  | $ 8,514 |
Common stock issued |  |  | 612 |
Other payable |  |  | 699 |
Recorded earn-out payable |  |  | 24 | $ 28
Total consideration |  |  | 9,849 |
Maximum potential earn-out payable |  |  | 48 |
Allocation of purchase price: |  |  |  |
Cash and equivalents |  |  | 319 |
Fiduciary cash |  |  | 536 |
Fiduciary receivables |  |  | 460 |
Other current assets |  |  | 1,135 |
Goodwill |  |  | 6,703 |
Other assets |  |  | 117 |
Total assets acquired |  |  | 12,577 |
Fiduciary liabilities |  |  | (993) |
Other current liabilities |  |  | (564) |
Deferred income tax, net |  |  | (113) |
Other long-term liabilities |  |  | (1,058) |
Total liabilities assumed |  |  | (2,728) |
Net assets acquired |  |  | 9,849 |
Purchased Customer Accounts and Other |  |  |  |
Allocation of purchase price: |  |  |  |
Intangible assets |  |  | 3,307 |
NBS Insurance Agency | Specialty Distribution |  |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |  |
Cash paid |  |  | 54 |
Common stock issued |  |  | 0 |
Other payable |  |  | 0 |
Recorded earn-out payable |  |  | 0 |
Total consideration |  |  | 54 |
Maximum potential earn-out payable |  |  | 0 |
Allocation of purchase price: |  |  |  |
Cash and equivalents |  |  | (3) |
Fiduciary cash |  |  | 14 |
Fiduciary receivables |  |  | (1) |
Other current assets |  |  | 4 |
Goodwill |  |  | 34 |
Other assets |  |  | 0 |
Total assets acquired |  |  | 64 |
Fiduciary liabilities |  |  | (10) |
Other current liabilities |  |  | 0 |
Deferred income tax, net |  |  | 0 |
Other long-term liabilities |  |  | 0 |
Total liabilities assumed |  |  | (10) |
Net assets acquired |  |  | 54 |
NBS Insurance Agency | Specialty Distribution | Purchased Customer Accounts and Other |  |  |  |
Allocation of purchase price: |  |  |  |
Intangible assets |  |  | 16 |
Tim Parkman, Inc. | Specialty Distribution |  |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |  |
Cash paid |  |  | 69 |
Common stock issued |  |  | 0 |
Other payable |  |  | 6 |
Recorded earn-out payable |  |  | 4 |
Total consideration |  |  | 79 |
Maximum potential earn-out payable |  |  | 23 |
Allocation of purchase price: |  |  |  |
Cash and equivalents |  |  | 0 |
Fiduciary cash |  |  | 0 |
Fiduciary receivables |  |  | 0 |
Other current assets |  |  | 0 |
Goodwill |  |  | 60 |
Other assets |  |  | 0 |
Total assets acquired |  |  | 79 |
Fiduciary liabilities |  |  | 0 |
Other current liabilities |  |  | 0 |
Deferred income tax, net |  |  | 0 |
Other long-term liabilities |  |  | 0 |
Total liabilities assumed |  |  | 0 |
Net assets acquired |  |  | 79 |
Tim Parkman, Inc. | Specialty Distribution | Purchased Customer Accounts and Other |  |  |  |
Allocation of purchase price: |  |  |  |
Intangible assets |  |  | 19 |
RSC Topco, Inc. |  |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |  |
Common stock issued | $ 612 | $ 1,045 |  |
RSC Topco, Inc. | Retail & Specialty Distribution |  |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |  |
Cash paid |  |  | 8,293 |
Common stock issued |  |  | 612 |
Other payable |  |  | 693 |
Recorded earn-out payable |  |  | 0 |
Total consideration |  |  | 9,598 |
Allocation of purchase price: |  |  |  |
Cash and equivalents |  |  | 316 |
Fiduciary cash |  |  | 516 |
Fiduciary receivables |  |  | 437 |
Other current assets |  |  | 1,129 |
Goodwill |  |  | 6,538 |
Other assets |  |  | 112 |
Total assets acquired |  |  | 12,284 |
Fiduciary liabilities |  |  | (957) |
Other current liabilities |  |  | (559) |
Deferred income tax, net |  |  | (114) |
Other long-term liabilities |  |  | (1,056) |
Total liabilities assumed |  |  | (2,686) |
Net assets acquired |  |  | 9,598 |
RSC Topco, Inc. | Retail & Specialty Distribution | Purchased Customer Accounts and Other |  |  |  |
Allocation of purchase price: |  |  |  |
Intangible assets |  |  | 3,236 |
Other Acquisitions | Retail & Specialty Distribution |  |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |  |
Cash paid |  |  | 98 |
Common stock issued |  |  | 0 |
Other payable |  |  | 0 |
Recorded earn-out payable |  |  | 20 |
Total consideration |  |  | 118 |
Maximum potential earn-out payable |  |  | 25 |
Allocation of purchase price: |  |  |  |
Cash and equivalents |  |  | 6 |
Fiduciary cash |  |  | 6 |
Fiduciary receivables |  |  | 24 |
Other current assets |  |  | 2 |
Goodwill |  |  | 71 |
Other assets |  |  | 5 |
Total assets acquired |  |  | 150 |
Fiduciary liabilities |  |  | (26) |
Other current liabilities |  |  | (5) |
Deferred income tax, net |  |  | 1 |
Other long-term liabilities |  |  | (2) |
Total liabilities assumed |  |  | (32) |
Net assets acquired |  |  | 118 |
Other Acquisitions | Retail & Specialty Distribution | Purchased Customer Accounts and Other |  |  |  |
Allocation of purchase price: |  |  |  |
Intangible assets |  |  | $ 36 |

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