Fair Value Measurements and Financial Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Assets
Cash and cash equivalents:	$ 1,367	$ 1,063
Short-term investments:	3,836	3,322
Total assets at fair value	7,686	6,569
Foreign Exchange Derivative
Assets
Prepaids and other current assets:	97	20
Liabilities
Accrued expenses, accounts payable, and other current liabilities	43	68
Corporate debt securities
Assets
Short-term investments:	2,698	2,288
Mortgage-backed and asset-backed securities
Assets
Short-term investments:	507	441
Government bonds
Assets
Short-term investments:	318	262
Commercial paper
Assets
Short-term investments:	185	182
Certificates of deposit
Assets
Short-term investments:	128	149
Level 1
Assets
Cash and cash equivalents:	1,080	901
Short-term investments:	0	0
Total assets at fair value	3,466	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:	287	162
Short-term investments:	3,836	3,322
Total assets at fair value	4,220	3,504
Level 2 \| Foreign Exchange Derivative
Assets
Prepaids and other current assets:	97	20
Liabilities
Accrued expenses, accounts payable, and other current liabilities	43	68
Level 2 \| Corporate debt securities
Assets
Short-term investments:	2,698	2,288
Level 2 \| Mortgage-backed and asset-backed securities
Assets
Short-term investments:	507	441
Level 2 \| Government bonds
Assets
Short-term investments:	318	262
Level 2 \| Commercial paper
Assets
Short-term investments:	185	182
Level 2 \| Certificates of deposit
Assets
Short-term investments:	128	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:	1,080	901
Funds receivable and amounts held on behalf of customers:	2,386	2,164
Money market funds \| Level 1
Assets
Cash and cash equivalents:	1,080	901
Funds receivable and amounts held on behalf of customers:	2,386	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:	126	98
Commercial paper \| Level 1
Assets
Cash and cash equivalents:	0	0
Commercial paper \| Level 2
Assets
Cash and cash equivalents:	126	98
Commercial paper \| Level 3
Assets
Cash and cash equivalents:	0	0
Government bonds
Assets
Cash and cash equivalents:	155	57
Government bonds \| Level 1
Assets
Cash and cash equivalents:	0	0
Government bonds \| Level 2
Assets
Cash and cash equivalents:	155	57
Government bonds \| Level 3
Assets
Cash and cash equivalents:	0	0
Corporate debt securities
Assets
Cash and cash equivalents:	6	7
Corporate debt securities \| Level 1
Assets
Cash and cash equivalents:	0	0
Corporate debt securities \| Level 2
Assets
Cash and cash equivalents:	6	7
Corporate debt securities \| Level 3
Assets
Cash and cash equivalents:	$ 0	$ 0

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