Revenues - Costs to Fulfill a Contract with a Customer (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Capitalized Costs To Fulfill Sales Contracts
Disaggregation of Revenue [Line Items]
Deferred cost balance	$ 59	$ 51
Capitalized Costs To Fulfill Sales Contracts | Operating Expense
Disaggregation of Revenue [Line Items]
Capitalized contract cost, amortization	128	120	$ 114
MA | Capitalized Costs To Obtain Sales Contracts
Disaggregation of Revenue [Line Items]
Deferred cost balance	337	294
MA | Capitalized Costs To Obtain Sales Contracts | Selling, General and Administrative Expenses
Disaggregation of Revenue [Line Items]
Capitalized contract cost, amortization	117	110	102
MA | Capitalized Costs To Fulfill Sales Contracts
Disaggregation of Revenue [Line Items]
Deferred cost balance	44	39
MA | Royalty Cost | Operating Expense
Disaggregation of Revenue [Line Items]
Capitalized contract cost, amortization	77	77	70
MIS | Capitalized Costs To Fulfill Sales Contracts
Disaggregation of Revenue [Line Items]
Deferred cost balance	15	12
MIS | Capitalization of Work-In-Process for In-Progress Ratings | Operating Expense
Disaggregation of Revenue [Line Items]
Capitalized contract cost, amortization	$ 51	$ 43	$ 44