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Variable Interest Entities (Details) - USD ($) $ in Millions	Mar. 31, 2025	Mar. 31, 2024
Variable Interest Entity [Line Items]
VIE consolidated assets	$ 75,140	$ 67,443
Unconsolidated VIE maximum exposure to loss	1,600	1,500
Consolidated Variable Interest Entities
Variable Interest Entity [Line Items]
VIE consolidated assets	610	601
VIE consolidated liabilities	$ 47	$ 41

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