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Variable Interest Entities (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Mar. 31, 2025
Variable Interest Entity [Line Items]    
VIE consolidated assets $ 82,323 $ 75,140
Unconsolidated VIE maximum exposure to loss 4,000 1,600
Consolidated Variable Interest Entities    
Variable Interest Entity [Line Items]    
VIE consolidated assets 818 610
VIE consolidated liabilities $ 287 $ 47