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Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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+ Details

Goodwill and Other Intangibles (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025	Dec. 31, 2024
Segment Reporting [Line Items]
Indefinite-lived intangible assets	$ 0		$ 0		$ 0
Goodwill	24,613,000,000	$ 23,949,000,000	24,613,000,000	$ 23,949,000,000	$ 24,337,000,000	$ 23,306,000,000
Aggregate amortization expense	142,000,000	$ 133,000,000	417,000,000	$ 412,000,000
Risk and Insurance Services
Segment Reporting [Line Items]
Goodwill expected to be tax deductible	56,000,000		56,000,000
Goodwill	19,800,000,000		19,800,000,000
Consulting
Segment Reporting [Line Items]
Goodwill expected to be tax deductible	51,000,000		51,000,000
Goodwill	$ 4,800,000,000		$ 4,800,000,000