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Accounting Policies - Narrative (Details) | 12 Months Ended
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Dec. 31, 2024 USD ($) segment reporting_unit | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Property, Plant and Equipment [Line Items] |  |  |
Number of reportable segments | segment | 5 |  |
Non-transactions revenue, intersegment revenue elimination | $ (14,208,000,000) | $ (12,497,000,000) | $ (11,181,000,000)
Contract assets | 69,000,000 | 75,000,000 |
Revenues recognized | 3,200,000,000 |  |
Capitalized contract costs | $ 291,000,000 | 234,000,000 |
Capitalized contract cost amortization period (in years) | 5 years |  |
Market value of cash and cash equivalents | $ 1,666,000,000 | 1,290,000,000 |
Restricted cash | 0 | 1,000,000 |
Gross deferred technology costs | 338,000,000 | 303,000,000 |
Accumulated amortization of deferred technology costs | 204,000,000 | 194,000,000 |
Fair value of our long-term debt borrowings | $ 10,000,000,000 | 10,300,000,000 |
Option to extend lease period (in years) | 12 years |  |
Number of reporting units | reporting_unit | 5 |  |
Goodwill impairment loss | $ 0 | 0 | 0
Impairment of intangible assets | 0 | 0 | 0
Cost of advertisement | 229,000,000 | 209,000,000 | 177,000,000
Undistributed accumulated earnings of foreign subsidiary | 8,500,000,000 |  |
Undistributed earnings of foreign subsidiaries reinvested indefinitely | $ 4,700,000,000 |  |
Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining lease terms (in years) | 1 year |  |
Minimum | Software and Software Development Costs |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment useful life | 3 years |  |
Minimum | Building and Improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment useful life | 15 years |  |
Minimum | Equipment and Furniture |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment useful life | 2 years |  |
Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining lease terms (in years) | 11 years |  |
Maximum | Software and Software Development Costs |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment useful life | 7 years |  |
Maximum | Building and Improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment useful life | 40 years |  |
Maximum | Equipment and Furniture |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment useful life | 10 years |  |
OSTTRA | Corporate Joint Venture |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Ownership interest of subsidiary (as a percent) | 50.00% |  |
Noncontrolling interest ownership by noncontrolling owners (as a percent) | 50.00% |  |
Non-transaction |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Non-transactions revenue, intersegment revenue elimination | $ (1,858,000,000) | (1,730,000,000) | (1,640,000,000)
Elimination |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Non-transactions revenue, intersegment revenue elimination | 186,000,000 | 177,000,000 | 169,000,000
Elimination | Non-transaction |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Non-transactions revenue, intersegment revenue elimination | $ 186,000,000 | $ 177,000,000 | $ 169,000,000

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