v3.25.1
Fair Value Measurements - Additional Information Relating To Asset-Backed Securities and Collateralized Debt Obligations (Detail)
$ in Millions
Mar. 31, 2025
USD ($)
AAA - A  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral $ 59
AAA - A | Level 2  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 50
AAA - A | Level 3  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 9
Asset-backed securities  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 144
Asset-backed securities | Level 2  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 50
Asset-backed securities | Level 3  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 94
Corporate loans | AAA - A  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 50
Corporate loans | AAA - A | Level 2  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 50
Corporate loans | AAA - A | Level 3  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 0
Other | BBB - B  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 85
Other | BBB - B | Level 2  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 0
Other | BBB - B | Level 3  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 85
Alt A | Home equity mortgages | AAA - A  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 9
Alt A | Home equity mortgages | AAA - A | Level 2  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral 0
Alt A | Home equity mortgages | AAA - A | Level 3  
Fair Value Of Other Financial Instrument [Line Items]  
Trading asset-backed securities and related collateral $ 9