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Merger with Athene - Schedule of Recognized for the Assets Acquired and Liabilities Assumed and Resulting Goodwill (Details) - USD ($)
$ in Millions
Jan. 01, 2022
Dec. 31, 2023
Dec. 31, 2022
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]      
Goodwill attributable to Athene   $ 4,329 $ 4,322
Athene Holding Limited      
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination [Abstract]      
Merger consideration $ 13,050    
Fair value of previously held equity interest 4,554    
Total AHL equity value held by AGM 17,604    
Total Value to Allocate      
Investments 176,015    
Cash and cash equivalents 9,479    
Restricted cash and cash equivalents 796    
Investment in related parties 33,863    
Reinsurance recoverable 4,977    
VOBA 3,372    
Assets of consolidated variable interest entities 3,635    
Other assets 6,115    
Estimated fair value of total assets acquired (excluding goodwill) 238,252    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]      
Interest sensitive contract liabilities 160,241    
Future policy benefits 41,482    
Market risk benefits 4,813    
Debt 3,295    
Payables for collateral on derivatives and securities to repurchase 7,044    
Liabilities of consolidated variable interest entities 461    
Other liabilities 2,443    
Estimated fair value of total liabilities assumed 219,779    
Non-controlling interest 4,942    
Estimated fair value of net assets acquired, excluding goodwill 13,531    
Goodwill attributable to Athene $ 4,073