Derivative Financial Instruments and Off-balance Sheet Financial Instruments - Summary of the volume and fair value positions (Details) $ in Millions	Dec. 31, 2022 USD ($) contract	Dec. 31, 2021 USD ($) contract
Derivatives, Fair Value
Total asset derivatives, notional amount	$ 628	$ 1,285
Total liability derivatives, notional amount	808	790
Total derivatives, notional amount	$ 1,436	$ 2,075
Total asset derivatives, number of contracts | contract	24,723,000,000	1,355
Total liability derivatives, number of contracts | contract	2,853,000,000	37,928
Total derivatives, number of contracts | contract	27,576,000,000	39,283
Net amount on balance sheet	$ 107	$ 76
Net amount on balance sheet	(4)	9
Total derivatives, fair value, net	103	85
Asset derivatives, gross asset	121	77
Liability derivatives, gross asset	8	23
Asset derivatives, gross liability	(14)	(1)
Liability derivatives, gross liability	$ (12)	$ (14)
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets, net, Other investments, net	Other assets, net, Other investments, net
Derivatives not designated as accounting hedging instruments
Derivatives, Fair Value
Total liability derivatives, number of contracts | contract		36,668
Net amount on balance sheet		$ (2)
Liability derivatives, gross asset		0
Liability derivatives, gross liability		$ (2)
Futures | Derivatives not designated as accounting hedging instruments
Derivatives, Fair Value
Total asset derivatives, number of contracts | contract	24,380,000,000	1,181
Total liability derivatives, number of contracts | contract	1,624,000,000
Net amount on balance sheet	$ 3	$ 1
Net amount on balance sheet	0
Asset derivatives, gross asset	3	1
Liability derivatives, gross asset	0
Asset derivatives, gross liability	0	$ 0
Liability derivatives, gross liability	$ 0
Options | Derivatives not designated as accounting hedging instruments
Derivatives, Fair Value
Total asset derivatives, number of contracts | contract		61
Net amount on balance sheet		$ 5
Asset derivatives, gross asset		5
Asset derivatives, gross liability		$ 0
Futures | Derivatives not designated as accounting hedging instruments
Derivatives, Fair Value
Total asset derivatives, number of contracts | contract	343,000,000	113
Total liability derivatives, number of contracts | contract	1,229,000,000	1,260
Net amount on balance sheet	$ 0	$ 0
Net amount on balance sheet	(1)	(1)
Asset derivatives, gross asset	0	0
Liability derivatives, gross asset	0	0
Asset derivatives, gross liability	0	0
Liability derivatives, gross liability	(1)	(1)
Foreign currency forwards | Derivatives not designated as accounting hedging instruments
Derivatives, Fair Value
Total asset derivatives, notional amount	354	2
Total liability derivatives, notional amount	283	715
Net amount on balance sheet	1	0
Net amount on balance sheet	0	16
Asset derivatives, gross asset	14	0
Liability derivatives, gross asset	7	23
Asset derivatives, gross liability	(13)	0
Liability derivatives, gross liability	(7)	(7)
Embedded derivative financial instruments
Derivatives, Fair Value
Total asset derivatives, notional amount		750
Net amount on balance sheet		0
Asset derivatives, gross asset		0
Asset derivatives, gross liability		0
Contingent consideration | Derivatives not designated as accounting hedging instruments
Derivatives, Fair Value
Total asset derivatives, notional amount	250	250
Net amount on balance sheet	103	65
Asset derivatives, gross asset	103	65
Asset derivatives, gross liability	0	0
Credit default swaps – buying protection | Derivatives not designated as accounting hedging instruments
Derivatives, Fair Value
Total asset derivatives, notional amount	24	33
Total liability derivatives, notional amount	525	70
Net amount on balance sheet	0	(1)
Net amount on balance sheet	(3)	(4)
Asset derivatives, gross asset	1	0
Liability derivatives, gross asset	1	0
Asset derivatives, gross liability	(1)	(1)
Liability derivatives, gross liability	$ (4)	(4)
Credit default swaps – selling protection | Derivatives not designated as accounting hedging instruments
Derivatives, Fair Value
Total asset derivatives, notional amount		250
Total liability derivatives, notional amount		5
Net amount on balance sheet		6
Net amount on balance sheet		0
Asset derivatives, gross asset		6
Liability derivatives, gross asset		0
Asset derivatives, gross liability		0
Liability derivatives, gross liability		$ 0