Restructuring Costs (Restructuring Activities) (Details) - Jardine Lloyd Thompson Group plc - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Restructuring Reserve [Roll Forward]
Liability at beginning of period	$ 69	$ 106
Restructuring charges	30	163
Cash payments	(39)	(178)
Non-cash charges	(6)	(22)
Liability at end of period	54	69
Severance
Restructuring Reserve [Roll Forward]
Liability at beginning of period	35	52
Restructuring charges	3	38
Cash payments	(16)	(55)
Non-cash charges	0	0
Liability at end of period	22	35
Real Estate Related Costs
Restructuring Reserve [Roll Forward]
Liability at beginning of period	34	51
Restructuring charges	6	31
Cash payments	(4)	(26)
Non-cash charges	(4)	(22)
Liability at end of period	32	34
Information Technology
Restructuring Reserve [Roll Forward]
Liability at beginning of period	0	2
Restructuring charges	5	23
Cash payments	(3)	(25)
Non-cash charges	(2)	0
Liability at end of period	0	0
Consulting and Other Outside Services
Restructuring Reserve [Roll Forward]
Liability at beginning of period	0	1
Restructuring charges	16	71
Cash payments	(16)	(72)
Non-cash charges	0	0
Liability at end of period	$ 0	$ 0