Vehicle Rental Activities - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2026	Mar. 31, 2025
Property, Plant and Equipment [Abstract]
Other accounts payables	$ 649	$ 449
Receivables due from former subsidiaries	$ 417	$ 231

Amount due from parties in nontrade transactions, classified as other.

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Name:	us-gaap_OtherReceivables
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant