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Business Combinations - Additional Information (Details) $ / shares in Units, shares in Millions, $ in Millions |  |  |  | 3 Months Ended | 9 Months Ended |  |  |  |  |
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Sep. 30, 2025 USD ($) $ / shares | Aug. 01, 2025 USD ($) $ / shares shares | Jun. 10, 2025 USD ($) $ / shares | Sep. 30, 2025 USD ($) $ / shares | Sep. 30, 2025 USD ($) Acquisition $ / shares | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) $ / shares | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of acquisitions | Acquisition |  |  |  |  | 37 |  |  |  |  |
Merger consideration shares amount |  |  |  |  | $ 612 |  |  |  |  |
Common stock, par value | $ / shares | $ 0.1 |  |  | $ 0.1 | $ 0.1 |  | $ 0.1 |  |  |
Total revenues related to acquisitions |  |  |  |  | $ 318 |  |  |  |  |
Income before income taxes related to acquisitions |  |  |  |  | 34 |  |  |  |  |
Measurement period adjustment, total net assets |  |  |  |  | 5 |  |  |  |  |
Measurement period adjustment, goodwill |  |  |  |  | 4 |  |  |  |  |
Estimated acquisition earn-out payables | $ 575 |  |  | $ 575 | 575 | $ 151 | $ 167 | $ 137 | $ 169 | $ 249
Maximum future contingency payments acquisitions | 353 |  |  | 353 | 353 |  |  |  |  |
Business combination potential earn out payable | 431 |  |  | 431 | 431 |  |  |  |  |
Other Noncurrent Liabilities |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated acquisition earn-out payables | 313 |  |  | 313 | 313 |  |  |  |  |
Accounts payable |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated acquisition earn-out payables | 262 |  |  | 262 | $ 262 |  |  |  |  |
Business Combinations - Stock Deals |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of acquisitions | Acquisition |  |  |  |  | 13 |  |  |  |  |
Assets and Assumed Certain Liabilities |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of acquisitions | Acquisition |  |  |  |  | 16 |  |  |  |  |
Book of Business Purchases |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of acquisitions | Acquisition |  |  |  |  | 8 |  |  |  |  |
RSC Topco, Inc. |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate purchase price |  | $ 9,598 |  |  |  |  |  |  |  |
Cash paid |  | 8,293 |  |  |  |  |  |  |  |
Merger consideration shares amount |  | $ 612 | $ 1,045 |  |  |  |  |  |  |
Common stock, par value | $ / shares |  | $ 0.1 | $ 0.1 |  |  |  |  |  |  |
Maximum potential earn-out amount | 0 |  |  | 0 | $ 0 |  |  |  |  |
RSC Topco, Inc. | Merger Agreement |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Net consideration held in escrow |  | $ 750 |  |  |  |  |  |  |  |
Cash held in escrow | 263 | 250 |  |  |  |  |  |  |  |
Equity held in escrow |  | 500 |  |  |  |  |  |  |  |
Merger consideration shares amount |  | $ 500 |  |  |  |  |  |  |  |
Business combination consideration escrowed shares issued | shares |  | 4.5 |  |  |  |  |  |  |  |
Share price per share | $ / shares |  | $ 110.57 |  |  |  |  |  |  |  |
Accession acquisition closing price per share | $ / shares |  | $ 92 |  |  |  |  |  |  |  |
Shares held in escrow |  | $ 406 |  |  |  |  |  |  |  |
Change in fair value of shares held in escrow |  |  |  | 8 |  |  |  |  |  |
RSC Topco, Inc. | Merger Agreement | Level 3 |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Shares held in escrow | 414 |  |  |  |  |  |  |  |  |
Business combination escrow liability amount | $ 676 |  |  | $ 676 | $ 676 |  |  |  |  |

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