Restructuring Costs (Restructuring Activities) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Restructuring Reserve [Roll Forward]
Restructuring charges	$ 65	$ 28	$ 118	$ 58
Jardine Lloyd Thompson Group plc
Restructuring Reserve [Roll Forward]
Liability at beginning of period			146	69	$ 69
Restructuring charges			118		427
Cash payments			(151)		(193)
Non-cash charges			(16)		(157)
Liability at end of period	97		97		146
Jardine Lloyd Thompson Group plc | Severance
Restructuring Reserve [Roll Forward]
Liability at beginning of period			88	35	35
Restructuring charges			46		111
Cash payments			(79)		(58)
Non-cash charges			0		0
Liability at end of period	55		55		88
Jardine Lloyd Thompson Group plc | Real Estate Related Costs
Restructuring Reserve [Roll Forward]
Liability at beginning of period			56	34	34
Restructuring charges			36		195
Cash payments			(37)		(25)
Non-cash charges			(15)		(148)
Liability at end of period	40		40		56
Jardine Lloyd Thompson Group plc | Information Technology
Restructuring Reserve [Roll Forward]
Liability at beginning of period			0	0	0
Restructuring charges			6		15
Cash payments			(5)		(6)
Non-cash charges			(1)		(9)
Liability at end of period	0		0		0
Jardine Lloyd Thompson Group plc | Consulting and Other Outside Services
Restructuring Reserve [Roll Forward]
Liability at beginning of period			2	$ 0	0
Restructuring charges			30		106
Cash payments			(30)		(104)
Non-cash charges			0		0
Liability at end of period	$ 2		$ 2		$ 2