v3.26.1
Derivatives and Hedging (Credit Derivatives) (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Derivative [Line Items]    
Gross Notional $ 5,756 $ 5,784
Credit Risk Derivative Liabilities, at Fair Value 56 112
Single Name    
Derivative [Line Items]    
Gross Notional 0 0
Credit Risk Derivative Liabilities, at Fair Value 0 0
Credit Default Index    
Derivative [Line Items]    
Gross Notional 5,756 5,784
Credit Risk Derivative Liabilities, at Fair Value $ 56 112
Credit Default Swaps Referencing Indices    
Derivative [Line Items]    
Credit derivatives written max length of maturities (in years) 11 years  
NAIC 1    
Derivative [Line Items]    
Gross Notional $ 0 0
Credit Risk Derivative Liabilities, at Fair Value 0 0
NAIC 1 | Single Name    
Derivative [Line Items]    
Gross Notional 0 0
Credit Risk Derivative Liabilities, at Fair Value 0 0
NAIC 1 | Credit Default Index    
Derivative [Line Items]    
Gross Notional 0 0
Credit Risk Derivative Liabilities, at Fair Value 0 0
NAIC 2    
Derivative [Line Items]    
Gross Notional 0 0
Credit Risk Derivative Liabilities, at Fair Value 0 0
NAIC 2 | Single Name    
Derivative [Line Items]    
Gross Notional 0 0
Credit Risk Derivative Liabilities, at Fair Value 0 0
NAIC 2 | Credit Default Index    
Derivative [Line Items]    
Gross Notional 0 0
Credit Risk Derivative Liabilities, at Fair Value 0 0
NAIC 3    
Derivative [Line Items]    
Gross Notional 5,024 5,043
Credit Risk Derivative Liabilities, at Fair Value 22 61
NAIC 3 | Single Name    
Derivative [Line Items]    
Gross Notional 0 0
Credit Risk Derivative Liabilities, at Fair Value 0 0
NAIC 3 | Credit Default Index    
Derivative [Line Items]    
Gross Notional 5,024 5,043
Credit Risk Derivative Liabilities, at Fair Value 22 61
NAIC 4    
Derivative [Line Items]    
Gross Notional 0 0
Credit Risk Derivative Liabilities, at Fair Value 0 0
NAIC 4 | Single Name    
Derivative [Line Items]    
Gross Notional 0 0
Credit Risk Derivative Liabilities, at Fair Value 0 0
NAIC 4 | Credit Default Index    
Derivative [Line Items]    
Gross Notional 0 0
Credit Risk Derivative Liabilities, at Fair Value 0 0
NAIC 5    
Derivative [Line Items]    
Gross Notional 0 0
Credit Risk Derivative Liabilities, at Fair Value 0 0
NAIC 5 | Single Name    
Derivative [Line Items]    
Gross Notional 0 0
Credit Risk Derivative Liabilities, at Fair Value 0 0
NAIC 5 | Credit Default Index    
Derivative [Line Items]    
Gross Notional 0 0
Credit Risk Derivative Liabilities, at Fair Value 0 0
NAIC 6    
Derivative [Line Items]    
Gross Notional 732 741
Credit Risk Derivative Liabilities, at Fair Value $ 34 $ 51
Credit Derivative, Maximum Exposure, Undiscounted Percentage 4.00% 3.00%
NAIC 6 | Single Name    
Derivative [Line Items]    
Gross Notional $ 0 $ 0
Credit Risk Derivative Liabilities, at Fair Value 0 0
NAIC 6 | Credit Default Index    
Derivative [Line Items]    
Gross Notional 732 741
Credit Risk Derivative Liabilities, at Fair Value $ 34 $ 51