v3.24.0.1
Investments - Summary of Cost and Carrying Value of Equity and Trading Debt Securities (Detail) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Total trading debt securities, Cost $ 1,911 $ 1,397
Trading securities 1,871 1,331
Equity securities at FVTNI, Carrying Value 1,585 1,211
Corporate Debt [Member]    
Schedule of Investments [Line Items]    
Total trading debt securities, Cost 1,225 823
Trading securities 1,218 795
Government Debt [Member]    
Schedule of Investments [Line Items]    
Total trading debt securities, Cost 501 420
Trading securities 489 400
Asset/Mortgage-Backed Debt [Member]    
Schedule of Investments [Line Items]    
Total trading debt securities, Cost 185 154
Trading securities 164 136
Equity Securities/Mutual Funds [Member]    
Schedule of Investments [Line Items]    
Equity securities at FVTNI, Cost 1,520 1,216
Equity securities at FVTNI, Carrying Value $ 1,585 $ 1,211