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Income Taxes - Tax Credit and Loss Carryforwards (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Tax Credit Carryforward [Line Items]    
Tax capital loss/credit carryforward $ 155 $ 154
Internal Revenue Service (IRS)    
Tax Credit Carryforward [Line Items]    
Net operating loss carryforwards 5,186 6,335
NOL carryforwards not subject to expiration 2,419  
NOLs subject to expiration 2,767  
State and Local Jurisdiction    
Tax Credit Carryforward [Line Items]    
Net operating loss carryforwards 2,148 $ 2,412
NOL carryforwards not subject to expiration 503  
NOLs subject to expiration $ 1,645