v3.25.2
Fair Value Measurements - Additional Information Relating To Asset-Backed Securities and Collateralized Debt Obligations (Detail)
$ in Millions
Jun. 30, 2025
USD ($)
AAA - A  
Fair Value Of Other Financial Instrument [Line Items]  
Available-for-sale asset-backed securities $ 138
AAA - A | Level 2  
Fair Value Of Other Financial Instrument [Line Items]  
Available-for-sale asset-backed securities 129
AAA - A | Level 3  
Fair Value Of Other Financial Instrument [Line Items]  
Available-for-sale asset-backed securities 9
Asset-backed securities  
Fair Value Of Other Financial Instrument [Line Items]  
Available-for-sale asset-backed securities 221
Asset-backed securities | Level 2  
Fair Value Of Other Financial Instrument [Line Items]  
Available-for-sale asset-backed securities 129
Asset-backed securities | Level 3  
Fair Value Of Other Financial Instrument [Line Items]  
Available-for-sale asset-backed securities 92
Corporate loans | AAA - A  
Fair Value Of Other Financial Instrument [Line Items]  
Available-for-sale asset-backed securities 129
Corporate loans | AAA - A | Level 2  
Fair Value Of Other Financial Instrument [Line Items]  
Available-for-sale asset-backed securities 129
Corporate loans | AAA - A | Level 3  
Fair Value Of Other Financial Instrument [Line Items]  
Available-for-sale asset-backed securities 0
Other | BBB - B  
Fair Value Of Other Financial Instrument [Line Items]  
Available-for-sale asset-backed securities 83
Other | BBB - B | Level 2  
Fair Value Of Other Financial Instrument [Line Items]  
Available-for-sale asset-backed securities 0
Other | BBB - B | Level 3  
Fair Value Of Other Financial Instrument [Line Items]  
Available-for-sale asset-backed securities 83
Alt A | Home equity mortgages | AAA - A  
Fair Value Of Other Financial Instrument [Line Items]  
Available-for-sale asset-backed securities 9
Alt A | Home equity mortgages | AAA - A | Level 2  
Fair Value Of Other Financial Instrument [Line Items]  
Available-for-sale asset-backed securities 0
Alt A | Home equity mortgages | AAA - A | Level 3  
Fair Value Of Other Financial Instrument [Line Items]  
Available-for-sale asset-backed securities $ 9