v3.26.3
INVESTMENTS - Held-to-Maturity Debt Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Jun. 30, 2026
Dec. 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Schedule of Held-to-maturity Securities [Line Items]            
Amortized Cost $ 16,003   $ 16,125      
Allowance for Credit Losses 4 $ 4 5 $ 5 $ 5 $ 5
Total fixed maturity securities, held-to-maturity, amortized cost 15,999 [1]   16,120      
Gross Unrealized Gains 0   87      
Gross Unrealized Losses 1,670   731      
Fair Value 14,329   15,476      
Yen-denominated            
Schedule of Held-to-maturity Securities [Line Items]            
Amortized Cost 16,003   16,125      
Allowance for Credit Losses 4   5      
Total fixed maturity securities, held-to-maturity, amortized cost 15,999   16,120      
Gross Unrealized Gains 0   87      
Gross Unrealized Losses 1,670   731      
Fair Value 14,329   15,476      
Japan government and agencies | Yen-denominated            
Schedule of Held-to-maturity Securities [Line Items]            
Amortized Cost 15,377   15,461      
Allowance for Credit Losses 1   2      
Total fixed maturity securities, held-to-maturity, amortized cost 15,376   15,459      
Gross Unrealized Gains 0   81      
Gross Unrealized Losses 1,604   713      
Fair Value 13,772   14,827      
Municipalities            
Schedule of Held-to-maturity Securities [Line Items]            
Fair Value 205   229      
Municipalities | Yen-denominated            
Schedule of Held-to-maturity Securities [Line Items]            
Amortized Cost 232   235      
Allowance for Credit Losses 0   0      
Total fixed maturity securities, held-to-maturity, amortized cost 232   235      
Gross Unrealized Gains 0   0      
Gross Unrealized Losses 27   6      
Fair Value 205   229      
Public utilities            
Schedule of Held-to-maturity Securities [Line Items]            
Fair Value 26   29      
Public utilities | Yen-denominated            
Schedule of Held-to-maturity Securities [Line Items]            
Amortized Cost 32   32      
Allowance for Credit Losses 0   0      
Total fixed maturity securities, held-to-maturity, amortized cost 32   32      
Gross Unrealized Gains 0   0      
Gross Unrealized Losses 6   3      
Fair Value 26   29      
Sovereign and supranational            
Schedule of Held-to-maturity Securities [Line Items]            
Fair Value 312   375      
Sovereign and supranational | Yen-denominated            
Schedule of Held-to-maturity Securities [Line Items]            
Amortized Cost 346   381      
Allowance for Credit Losses 3   3      
Total fixed maturity securities, held-to-maturity, amortized cost 343   378      
Gross Unrealized Gains 0   6      
Gross Unrealized Losses 31   9      
Fair Value 312   375      
Other corporate            
Schedule of Held-to-maturity Securities [Line Items]            
Fair Value 14   16      
Other corporate | Yen-denominated            
Schedule of Held-to-maturity Securities [Line Items]            
Amortized Cost 16   16      
Allowance for Credit Losses 0   0      
Total fixed maturity securities, held-to-maturity, amortized cost 16   16      
Gross Unrealized Gains 0   0      
Gross Unrealized Losses 2   0      
Fair Value $ 14   $ 16      
[1] Net of allowance for credit losses