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Schedule I (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Other Investments $ 13,696 $ 11,169
Cost or Amortized Cost [1] 121,248  
Fair Value 112,871  
Amount at Which Shown in the Balance Sheet 113,280  
All Related Party [Member]    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Other Investments 271  
Fixed maturities available for sale    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost [1] 93,186  
Fair Value 85,220  
Amount at Which Shown in the Balance Sheet 85,220  
Fixed maturities available for sale | U.S. Treasury / Agency    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 2,792  
Fair Value 2,626  
Amount at Which Shown in the Balance Sheet 2,626  
Fixed maturities available for sale | Non-U.S.    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 28,005  
Fair Value 25,908  
Amount at Which Shown in the Balance Sheet 25,908  
Fixed maturities available for sale | Corporate securities    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 40,440  
Fair Value 36,955  
Amount at Which Shown in the Balance Sheet 36,955  
Fixed maturities available for sale | Mortgage-backed securities    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 17,868  
Fair Value 15,851  
Amount at Which Shown in the Balance Sheet 15,851  
Fixed maturities available for sale | States, municipalities, and political subdivisions    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 4,081  
Fair Value 3,880  
Amount at Which Shown in the Balance Sheet 3,880  
Fixed maturities held to maturity    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost [1] 8,848  
Fair Value 8,439  
Amount at Which Shown in the Balance Sheet 8,848  
Fixed maturities held to maturity | U.S. Treasury / Agency    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 1,417  
Fair Value 1,370  
Amount at Which Shown in the Balance Sheet 1,417  
Fixed maturities held to maturity | Non-U.S.    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 1,136  
Fair Value 1,054  
Amount at Which Shown in the Balance Sheet 1,136  
Fixed maturities held to maturity | Corporate securities    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 1,705  
Fair Value 1,580  
Amount at Which Shown in the Balance Sheet 1,705  
Fixed maturities held to maturity | Mortgage-backed securities    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 1,455  
Fair Value 1,351  
Amount at Which Shown in the Balance Sheet 1,455  
Fixed maturities held to maturity | States, municipalities, and political subdivisions    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 3,135  
Fair Value 3,084  
Amount at Which Shown in the Balance Sheet 3,135  
Industrial, miscellaneous, and all others    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 827  
Fair Value 827  
Amount at Which Shown in the Balance Sheet 827  
Short-term investments    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 4,962  
Fair Value 4,960  
Amount at Which Shown in the Balance Sheet 4,960  
Other investments    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost [2] 13,425  
Fair Value [2] 13,425  
Amount at Which Shown in the Balance Sheet [2] $ 13,425  
[1] Net of valuation allowance for expected credit losses.
[2] Excludes $271 million of related party investments.