Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2021

Fair Value Disclosures [Abstract]

Assets measured at fair value on a recurring basis

	September 30, 2021								December 31, 2020
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
	(in millions)
Assets
Investments (Note 4)	$	9,637	$	115	$	42	$	9,794	$	8,546	$	174	$	41	$	8,761
Derivative assets, net (Note 6)		—		796		—		796		—		785		—		785
	$	9,637	$	911	$	42	$	10,590	$	8,546	$	959	$	41	$	9,546
Liabilities
Securities sold, not yet purchased (Note 4)	$	4,957	$	—	$	—	$	4,957	$	2,521	$	—	$	—	$	2,521
Derivative liabilities, net (Note 6)		—		479		—		479		11		628		—		639
Other liabilities		—		442		—		442		—		214		—		214
	$	4,957	$	921	$	—	$	5,878	$	2,532	$	842	$	—	$	3,374

The changes in investments measured at fair value on a recurring basis for which we use Level 3 inputs to determine fair value are as follows:

Assets measured at fair value on a recurring basis for which we use Level 3 inputs to determine fair value

	Nine Months Ended September 30,
	2021		2020
	(in millions)
Balance at January 1	$	41	$	3
Transfer in from Level 2		—		136
Purchases		1		63
Other		—		(1)
Balance at September 30	$	42	$	201