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Fair Value Measurements - Additional Information Relating To Asset-Backed Securities and Collateralized Debt Obligations (Detail) - Level 3
$ in Millions
Mar. 31, 2022
USD ($)
Other | BBB - B  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral $ 97
Available-for-sale securities  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 114
Alt A | Home equity | AAA - A  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral $ 17