Restructuring Costs (Narrative) (Details) - Jardine Lloyd Thompson Group plc - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2022	Dec. 31, 2021
Restructuring Cost and Reserve [Line Items]
Costs incurred		$ 96	$ 163
Acquisition Related
Restructuring Cost and Reserve [Line Items]
Costs incurred	$ 38	96
Acquisition Related | Corporate
Restructuring Cost and Reserve [Line Items]
Costs incurred	15	36
Acquisition Related | Risk and Insurance Services
Restructuring Cost and Reserve [Line Items]
Costs incurred	18	44
Acquisition Related | Consulting
Restructuring Cost and Reserve [Line Items]
Costs incurred	$ 5	$ 16