Equity Securities (Tables)

9 Months Ended

Sep. 30, 2022

Investments Debt And Equity Securities [Abstract]

Summary of Investments in Equity Securities, by Accounting Classification

Investments in equity securities, by accounting classification, are summarized as follows:

(in millions)	September 30, 2022		December 31, 2021
Marketable equity securities	$	292	$	657
Non-marketable equity securities		406		441
Equity method investments		66		78
	$	764	$	1,176

Summary of Investments in Marketable Equity Securities

Investments in marketable equity securities are summarized as follows:

(in millions)	Cost		Unrealized gains (losses)			Estimated fair value
September 30, 2022
Common stocks	$	328	$	(48	)	$	280
Preferred stocks		15		(3	)		12
	$	343	$	(51	)	$	292
December 31, 2021
Common stocks	$	418		222		$	640
Preferred stocks		17		—			17
	$	435	$	222		$	657

Summary of Investments in Non-Marketable Equity Securities

Investments in non-marketable equity securities are summarized as follows:

(in millions)	Cost		Unrealized gains		Carrying amount
September 30, 2022	$	244	$	162	$	406
December 31, 2021	$	215	$	226	$	441