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Dispositions - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Nov. 01, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Oct. 01, 2021
Business Acquisition [Line Items]          
Loss on disposition of operations, net of tax   $ 0 $ 0 $ 4,031  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Allstate Life Insurance Company Of New York          
Business Acquisition [Line Items]          
Definitive agreement with Wilton Reassurance         $ 400
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Allstate Life Insurance Company          
Business Acquisition [Line Items]          
Proceeds from affiliates $ 4,000        
Pre-close dividend received $ 1,250        
Disposal Group, Disposed of by Sale, Not Discontinued Operations | ALNY And ALIC          
Business Acquisition [Line Items]          
Loss on disposition of operations, net of tax       $ 4,090