Investments in Marketable Securities - Summary of Investments in Marketable Securities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Mar. 31, 2022
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, Amortized cost	$ 1,411	$ 1,372
Available-for-sale debt securities, Unrealized gains	4	6
Available-for-sale debt securities, Unrealized losses	(172)	(74)
Available-for-sale debt securities, Fair value	1,243	1,304
Equity investments, Fair value	3,275	3,649
Investments in marketable securities total	4,518	4,953
U.S. government and agency obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, Amortized cost	714	538
Available-for-sale debt securities, Unrealized gains	1	0
Available-for-sale debt securities, Unrealized losses	(78)	(29)
Available-for-sale debt securities, Fair value	637	509
Foreign government and agency obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, Amortized cost	13	26
Available-for-sale debt securities, Unrealized gains	0	0
Available-for-sale debt securities, Unrealized losses	(2)	(3)
Available-for-sale debt securities, Fair value	11	23
Municipal debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, Amortized cost	8	9
Available-for-sale debt securities, Unrealized gains	1	1
Available-for-sale debt securities, Unrealized losses	(1)	0
Available-for-sale debt securities, Fair value	8	10
Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, Amortized cost	457	598
Available-for-sale debt securities, Unrealized gains	1	4
Available-for-sale debt securities, Unrealized losses	(69)	(34)
Available-for-sale debt securities, Fair value	389	568
U.S. government agency mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, Amortized cost	54	20
Available-for-sale debt securities, Unrealized gains	0	0
Available-for-sale debt securities, Unrealized losses	(4)	0
Available-for-sale debt securities, Fair value	50	20
Non-agency residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, Amortized cost	10	11
Available-for-sale debt securities, Unrealized gains	0	0
Available-for-sale debt securities, Unrealized losses	(2)	(1)
Available-for-sale debt securities, Fair value	8	10
Non-agency commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, Amortized cost	84	88
Available-for-sale debt securities, Unrealized gains	1	1
Available-for-sale debt securities, Unrealized losses	(8)	(3)
Available-for-sale debt securities, Fair value	77	86
Asset-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, Amortized cost	71	82
Available-for-sale debt securities, Unrealized gains	0	0
Available-for-sale debt securities, Unrealized losses	(8)	(4)
Available-for-sale debt securities, Fair value	$ 63	$ 78

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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