Fair Value - Fair Value Measurements on a Recurring Basis (Details) - Recurring - USD ($) $ in Millions	Dec. 31, 2021	Mar. 31, 2021
ASSETS
Other securities	$ 55	$ 57
Total assets	132	147
Liabilities:
Contingent consideration	13	27
Total liabilities	13	27
Level 1
ASSETS
Other securities	0	0
Total assets	77	90
Liabilities:
Contingent consideration	0	0
Total liabilities	0	0
Level 2
ASSETS
Other securities	53	55
Total assets	53	55
Liabilities:
Contingent consideration	0	0
Total liabilities	0	0
Cost basis	55	57
Unrealized losses	(2)	(2)
Level 3
ASSETS
Other securities	2	2
Total assets	2	2
Liabilities:
Contingent consideration	13	27
Total liabilities	13	27
Money market funds and money market deposit accounts
ASSETS
Cash and cash equivalents	14	12
Money market funds and money market deposit accounts | Level 1
ASSETS
Cash and cash equivalents	14	12
Money market funds and money market deposit accounts | Level 2
ASSETS
Cash and cash equivalents	0	0
Money market funds and money market deposit accounts | Level 3
ASSETS
Cash and cash equivalents	0	0
Time deposits
ASSETS
Cash and cash equivalents	63	78
Time deposits | Level 1
ASSETS
Cash and cash equivalents	63	78
Time deposits | Level 2
ASSETS
Cash and cash equivalents	0	0
Time deposits | Level 3
ASSETS
Cash and cash equivalents	$ 0	$ 0