Derivative Financial Instruments - Summary of the volume and fair value positions of derivative instruments (Details) $ in Millions	Mar. 31, 2023 USD ($) contract	Dec. 31, 2022 USD ($) contract
Derivatives, Fair Value
Total asset derivatives, notional amount	$ 754	$ 628
Total liability derivatives, notional amount	179	808
Total derivatives, notional amount	$ 933	$ 1,436
Total asset derivatives, number of contracts | contract	7,958,000,000	24,723,000,000
Total liability derivatives, number of contracts | contract	13,074,000,000	2,853,000,000
Total derivatives, Number of contracts | contract	21,032,000,000	27,576,000,000
Net amount on balance sheet	$ 107	$ 107
Net amount on balance sheet	(2)	(4)
Total derivatives, fair value, net	105	103
Gross amount	122	121
Liability derivatives, gross asset	4	8
Asset derivatives, gross liability	(15)	(14)
Liability derivatives gross amount	$ (6)	$ (12)
Futures | Derivatives not designated as accounting hedging instruments
Derivatives, Fair Value
Total asset derivatives, number of contracts | contract	6,842,000,000	24,380,000,000
Total liability derivatives, number of contracts | contract	12,394,000,000	1,624,000,000
Net amount on balance sheet	$ 2	$ 3
Net amount on balance sheet	(3)	0
Gross amount	2	3
Liability derivatives, gross asset	0	0
Asset derivatives, gross liability	0	0
Liability derivatives gross amount	$ (3)	$ 0
Futures | Derivatives not designated as accounting hedging instruments
Derivatives, Fair Value
Total asset derivatives, number of contracts | contract	1,116,000,000	343,000,000
Total liability derivatives, number of contracts | contract	680,000,000	1,229,000,000
Net amount on balance sheet	$ 2	$ 0
Net amount on balance sheet	(2)	(1)
Gross amount	2	0
Liability derivatives, gross asset	0	0
Asset derivatives, gross liability	0	0
Liability derivatives gross amount	(2)	(1)
Foreign currency forwards | Derivatives not designated as accounting hedging instruments
Derivatives, Fair Value
Total asset derivatives, notional amount	453	354
Total liability derivatives, notional amount	176	283
Net amount on balance sheet	(9)	1
Net amount on balance sheet	3	0
Gross amount	5	14
Liability derivatives, gross asset	4	7
Asset derivatives, gross liability	(14)	(13)
Liability derivatives gross amount	(1)	(7)
Contingent consideration | Derivatives not designated as accounting hedging instruments
Derivatives, Fair Value
Total asset derivatives, notional amount	250	250
Net amount on balance sheet	112	103
Gross amount	112	103
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	51	24
Total liability derivatives, notional amount	3	525
Net amount on balance sheet	0	0
Net amount on balance sheet	0	(3)
Gross amount	1	1
Liability derivatives, gross asset	0	1
Asset derivatives, gross liability	(1)	(1)
Liability derivatives gross amount	$ 0	$ (4)