Fair Value - Fair Value Measurements on a Recurring Basis (Details) - Recurring - USD ($) $ in Millions	Sep. 30, 2022	Mar. 31, 2022
ASSETS
Other securities	$ 42	$ 51
Total assets	84	107
Liabilities:
Contingent consideration	2	8
Total liabilities	2	8
Level 1
ASSETS
Other securities	0	0
Total assets	42	56
Liabilities:
Contingent consideration	0	0
Total liabilities	0	0
Level 2
ASSETS
Other securities	40	49
Total assets	40	49
Liabilities:
Contingent consideration	0	0
Total liabilities	0	0
Cost basis	47	53
Level 3
ASSETS
Other securities	2	2
Total assets	2	2
Liabilities:
Contingent consideration	2	8
Total liabilities	2	8
Money market funds and money market deposit accounts
ASSETS
Cash and cash equivalents	5	5
Money market funds and money market deposit accounts | Level 1
ASSETS
Cash and cash equivalents	5	5
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	37	51
Time deposits | Level 1
ASSETS
Cash and cash equivalents	37	51
Time deposits | Level 2
ASSETS
Cash and cash equivalents	0	0
Time deposits | Level 3
ASSETS
Cash and cash equivalents	$ 0	$ 0