Restructuring Costs (Restructuring and Related Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Restructuring Cost and Reserve [Line Items]
Total	$ 222	$ 276
Corporate
Restructuring Cost and Reserve [Line Items]
Total	24	49
Risk and Insurance Services
Restructuring Cost and Reserve [Line Items]
Total	134	148
Consulting
Restructuring Cost and Reserve [Line Items]
Total	$ 64	$ 79

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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