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Variable Interest Entities (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Mar. 31, 2021
Variable Interest Entity [Line Items]    
VIE consolidated assets $ 63,298 $ 65,015
Unconsolidated VIE maximum exposure to loss 1,400 1,500
Consolidated Variable Interest Entities    
Variable Interest Entity [Line Items]    
VIE consolidated assets 660 662
VIE consolidated liabilities $ 65 $ 74