Investments in Marketable Securities - Summary of Investments in Marketable Securities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Mar. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, Amortized cost	$ 1,339	$ 726
Available-for-sale debt securities, Unrealized gains	28	24
Available-for-sale debt securities, Unrealized losses	(12)	(14)
Available-for-sale debt securities, Fair value	1,355	736
Equity investments, Fair value	3,766	4,084
Investments in marketable securities total	5,121	4,820
U.S. government and agency obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, Amortized cost	491	217
Available-for-sale debt securities, Unrealized gains	5	4
Available-for-sale debt securities, Unrealized losses	(6)	(10)
Available-for-sale debt securities, Fair value	490	211
Foreign government and agency obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, Amortized cost	32
Available-for-sale debt securities, Unrealized gains	0
Available-for-sale debt securities, Unrealized losses	(1)
Available-for-sale debt securities, Fair value	31
Municipal debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, Amortized cost	9	8
Available-for-sale debt securities, Unrealized gains	2	2
Available-for-sale debt securities, Unrealized losses	0	0
Available-for-sale debt securities, Fair value	11	10
Commercial paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, Amortized cost	25	196
Available-for-sale debt securities, Unrealized gains	0	0
Available-for-sale debt securities, Unrealized losses	0	0
Available-for-sale debt securities, Fair value	25	196
Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, Amortized cost	589	177
Available-for-sale debt securities, Unrealized gains	15	12
Available-for-sale debt securities, Unrealized losses	(3)	(2)
Available-for-sale debt securities, Fair value	601	187
U.S. government agency mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, Amortized cost	21	31
Available-for-sale debt securities, Unrealized gains	1	1
Available-for-sale debt securities, Unrealized losses	0	0
Available-for-sale debt securities, Fair value	22	32
Non-agency residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, Amortized cost	11	1
Available-for-sale debt securities, Unrealized gains	0	0
Available-for-sale debt securities, Unrealized losses	0	0
Available-for-sale debt securities, Fair value	11	1
Non-agency commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, Amortized cost	75	47
Available-for-sale debt securities, Unrealized gains	2	2
Available-for-sale debt securities, Unrealized losses	(1)	(2)
Available-for-sale debt securities, Fair value	76	47
Asset-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, Amortized cost	86	49
Available-for-sale debt securities, Unrealized gains	3	3
Available-for-sale debt securities, Unrealized losses	(1)	0
Available-for-sale debt securities, Fair value	$ 88	$ 52

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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