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Commitments and Contingencies - Restricted Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Loss Contingencies [Line Items]    
Pledged Collateral $ 2,467 $ 2,007
FHLB restricted stock 83 65
Trading securities 34 35
Cash and cash equivalents 25 21
Total restricted assets 3,870 3,651
Securities pledged    
Loss Contingencies [Line Items]    
Securities loaned to lending agent 731 1,083
Securities pledged/obligations under repurchase agreements 326 281
Securities Loaned    
Loss Contingencies [Line Items]    
Securities Owned and Pledged as Collateral 204 159
Collateral pledged    
Loss Contingencies [Line Items]    
Debt Securities, Available-for-Sale, Restricted $ 1,261 $ 1,523