Fair Value Measurements and Financial Instruments - Schedule of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Assets
Cash and cash equivalents:	$ 1,212	$ 1,063
Short-term investments:	4,116	3,322
Total assets at fair value	6,105	6,569
Foreign Exchange Derivative
Assets
Prepaids and other current assets:	84	20
Liabilities
Accrued expenses, accounts payable, and other current liabilities	42	68
Corporate debt securities
Assets
Short-term investments:	3,085	2,288
Mortgage-backed and asset-backed securities
Assets
Short-term investments:	567	441
Government bonds
Assets
Short-term investments:	369	262
Commercial paper
Assets
Short-term investments:	39	182
Certificates of deposit
Assets
Short-term investments:	56	149
Level 1
Assets
Cash and cash equivalents:	1,188	901
Short-term investments:	0	0
Total assets at fair value	1,881	3,065
Level 1 \| Foreign Exchange Derivative
Assets
Prepaids and other current assets:	0	0
Liabilities
Accrued expenses, accounts payable, and other current liabilities	0	0
Level 1 \| Corporate debt securities
Assets
Short-term investments:	0	0
Level 1 \| Mortgage-backed and asset-backed securities
Assets
Short-term investments:	0	0
Level 1 \| Government bonds
Assets
Short-term investments:	0	0
Level 1 \| Commercial paper
Assets
Short-term investments:	0	0
Level 1 \| Certificates of deposit
Assets
Short-term investments:	0	0
Level 2
Assets
Cash and cash equivalents:	24	162
Short-term investments:	4,116	3,322
Total assets at fair value	4,224	3,504
Level 2 \| Foreign Exchange Derivative
Assets
Prepaids and other current assets:	84	20
Liabilities
Accrued expenses, accounts payable, and other current liabilities	42	68
Level 2 \| Corporate debt securities
Assets
Short-term investments:	3,085	2,288
Level 2 \| Mortgage-backed and asset-backed securities
Assets
Short-term investments:	567	441
Level 2 \| Government bonds
Assets
Short-term investments:	369	262
Level 2 \| Commercial paper
Assets
Short-term investments:	39	182
Level 2 \| Certificates of deposit
Assets
Short-term investments:	56	149
Level 3
Assets
Cash and cash equivalents:	0	0
Short-term investments:	0	0
Total assets at fair value	0	0
Level 3 \| Foreign Exchange Derivative
Assets
Prepaids and other current assets:	0	0
Liabilities
Accrued expenses, accounts payable, and other current liabilities	0	0
Level 3 \| Corporate debt securities
Assets
Short-term investments:	0	0
Level 3 \| Mortgage-backed and asset-backed securities
Assets
Short-term investments:	0	0
Level 3 \| Government bonds
Assets
Short-term investments:	0	0
Level 3 \| Commercial paper
Assets
Short-term investments:	0	0
Level 3 \| Certificates of deposit
Assets
Short-term investments:	0	0
Money market funds
Assets
Cash and cash equivalents:	1,188	901
Funds receivable and amounts held on behalf of customers:	693	2,164
Money market funds \| Level 1
Assets
Cash and cash equivalents:	1,188	901
Funds receivable and amounts held on behalf of customers:	693	2,164
Money market funds \| Level 2
Assets
Cash and cash equivalents:	0	0
Funds receivable and amounts held on behalf of customers:	0	0
Money market funds \| Level 3
Assets
Cash and cash equivalents:	0	0
Funds receivable and amounts held on behalf of customers:	0	0
Commercial paper
Assets
Cash and cash equivalents:	9	98
Commercial paper \| Level 1
Assets
Cash and cash equivalents:	0	0
Commercial paper \| Level 2
Assets
Cash and cash equivalents:	9	98
Commercial paper \| Level 3
Assets
Cash and cash equivalents:	0	0
Government bonds
Assets
Cash and cash equivalents:	3	57
Government bonds \| Level 1
Assets
Cash and cash equivalents:	0	0
Government bonds \| Level 2
Assets
Cash and cash equivalents:	3	57
Government bonds \| Level 3
Assets
Cash and cash equivalents:	0	0
Corporate debt securities
Assets
Cash and cash equivalents:	12	7
Corporate debt securities \| Level 1
Assets
Cash and cash equivalents:	0	0
Corporate debt securities \| Level 2
Assets
Cash and cash equivalents:	12	7
Corporate debt securities \| Level 3
Assets
Cash and cash equivalents:	$ 0	$ 0

Funds Held For Clients, Fair Value Disclosure

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Fair value portion of asset recognized for present right to economic benefit.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

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