v3.25.2
INVESTMENTS - Held-to-Maturity Debt Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Schedule of Held-to-maturity Securities [Line Items]            
Amortized Cost $ 17,439   $ 15,971      
Allowance for Credit Loss 5 $ 5 5 $ 5 $ 5 $ 5
Total fixed maturity securities, held-to- maturity, amortized cost 17,434 [1]   15,966      
Gross Unrealized Gains 446   815      
Gross Unrealized Losses 273   9      
Fair Value 17,607   16,772      
Yen-denominated            
Schedule of Held-to-maturity Securities [Line Items]            
Amortized Cost 17,439   15,971      
Allowance for Credit Loss 5   5      
Total fixed maturity securities, held-to- maturity, amortized cost 17,434   15,966      
Gross Unrealized Gains 446   815      
Gross Unrealized Losses 273   9      
Fair Value 17,607   16,772      
Japan government and agencies | Yen-denominated            
Schedule of Held-to-maturity Securities [Line Items]            
Amortized Cost 16,720   15,311      
Allowance for Credit Loss 2   2      
Total fixed maturity securities, held-to- maturity, amortized cost 16,718   15,309      
Gross Unrealized Gains 414   759      
Gross Unrealized Losses 272   9      
Fair Value 16,860   16,059      
Municipalities            
Schedule of Held-to-maturity Securities [Line Items]            
Amortized Cost 255   235      
Fair Value 265   257      
Municipalities | Yen-denominated            
Schedule of Held-to-maturity Securities [Line Items]            
Amortized Cost 255   235      
Allowance for Credit Loss 0   0      
Total fixed maturity securities, held-to- maturity, amortized cost 255   235      
Gross Unrealized Gains 10   22      
Gross Unrealized Losses 0   0      
Fair Value 265   257      
Public utilities            
Schedule of Held-to-maturity Securities [Line Items]            
Amortized Cost 35   32      
Fair Value 34   33      
Public utilities | Yen-denominated            
Schedule of Held-to-maturity Securities [Line Items]            
Amortized Cost 35   32      
Allowance for Credit Loss 0   0      
Total fixed maturity securities, held-to- maturity, amortized cost 35   32      
Gross Unrealized Gains 0   1      
Gross Unrealized Losses 1   0      
Fair Value 34   33      
Sovereign and supranational            
Schedule of Held-to-maturity Securities [Line Items]            
Amortized Cost 409   374      
Fair Value 430   405      
Sovereign and supranational | Yen-denominated            
Schedule of Held-to-maturity Securities [Line Items]            
Amortized Cost 412   377      
Allowance for Credit Loss 3   3      
Total fixed maturity securities, held-to- maturity, amortized cost 409   374      
Gross Unrealized Gains 21   31      
Gross Unrealized Losses 0   0      
Fair Value 430   405      
Other corporate            
Schedule of Held-to-maturity Securities [Line Items]            
Amortized Cost 17   16      
Fair Value 18   18      
Other corporate | Yen-denominated            
Schedule of Held-to-maturity Securities [Line Items]            
Amortized Cost 17   16      
Allowance for Credit Loss 0   0      
Total fixed maturity securities, held-to- maturity, amortized cost 17   16      
Gross Unrealized Gains 1   2      
Gross Unrealized Losses 0   0      
Fair Value $ 18   $ 18      
[1] Net of allowance for credit losses