Segment Information (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Threshold litigation amount	$ 5
Assets under vehicle programs		$ 23,729	$ 22,979
Americas
Segment Reporting Information [Line Items]
Assets under vehicle programs		$ 20,200	$ 19,300