Restructuring Costs (Narrative) (Details) - Jardine Lloyd Thompson Group plc - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Restructuring Cost and Reserve [Line Items]
Costs incurred		$ 58	$ 163
Acquisition related
Restructuring Cost and Reserve [Line Items]
Costs incurred	$ 28	58
Acquisition related | Corporate
Restructuring Cost and Reserve [Line Items]
Costs incurred	13	21
Acquisition related | Risk and Insurance Services Segment
Restructuring Cost and Reserve [Line Items]
Costs incurred	11	26
Acquisition related | Consulting Segment
Restructuring Cost and Reserve [Line Items]
Costs incurred	$ 4	$ 11