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Background and Business Description - Redemption of Notes - USD ($)
$ in Millions
12 Months Ended
Jan. 15, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Net realized gains on extinguishment of debt   $ 81 $ 33 $ 0
5.1% Surplus Notes, General Account, Due 2020 [Member]        
Net realized gains on extinguishment of debt   (134)    
Subsequent Event        
Remaining Cash Required For Repayment of Tier 2 Notes $ 6      
Nomura Credit & Capital, Inc.        
Proceeds from Legal Settlements   140    
Nomura Credit & Capital, Inc. | Subsequent Event        
Proceeds from Legal Settlements 140      
Sitka AAC Note | Ambac Assurance Corporation [Member]        
Repayments of Long-term Debt   $ 1,218    
Long-term Debt, Repayment, Premium Paid on Principal   103.00%    
Net realized gains on extinguishment of debt   $ 53    
Portion of Gain (Loss) on Extinguishment of Debt Attributable to AACs Ownership of Sitka Notes   5    
Tier 2 Notes [Member] | Ambac Assurance Corporation [Member]        
Repayments of Long-term Debt   $ 213    
Tier 2 Notes [Member] | Ambac Assurance Corporation [Member] | Subsequent Event        
Repayments of Long-term Debt $ 146