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Schedule I (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Other Investments $ 11,169 $ 7,945
Cost or Amortized Cost 119,450  
Fair Value 122,607  
Amount at Which Shown in the Balance Sheet 122,078  
All Related Party [Member]    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Other Investments 245  
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 90,479  
Fair Value 93,108  
Amount at Which Shown in the Balance Sheet 93,108  
Fixed maturities available for sale | U.S. Treasury and agency    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 2,111  
Fair Value 2,214  
Amount at Which Shown in the Balance Sheet 2,214  
Fixed maturities available for sale | Foreign    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 25,148  
Fair Value 25,829  
Amount at Which Shown in the Balance Sheet 25,829  
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 37,838  
Fair Value 39,063  
Amount at Which Shown in the Balance Sheet 39,063  
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 20,080  
Fair Value 20,489  
Amount at Which Shown in the Balance Sheet 20,489  
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 5,302  
Fair Value 5,513  
Amount at Which Shown in the Balance Sheet 5,513  
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 10,118  
Fair Value 10,647  
Amount at Which Shown in the Balance Sheet 10,118  
Fixed maturities held to maturity | U.S. Treasury and agency    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 1,213  
Fair Value 1,244  
Amount at Which Shown in the Balance Sheet 1,213  
Fixed maturities held to maturity | Foreign    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 1,196  
Fair Value 1,262  
Amount at Which Shown in the Balance Sheet 1,196  
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 2,004  
Fair Value 2,201  
Amount at Which Shown in the Balance Sheet 2,004  
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 1,730  
Fair Value 1,803  
Amount at Which Shown in the Balance Sheet 1,730  
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 3,975  
Fair Value 4,137  
Amount at Which Shown in the Balance Sheet 3,975  
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 4,782  
Fair Value 4,782  
Amount at Which Shown in the Balance Sheet 4,782  
Short-term investments    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 3,147  
Fair Value 3,146  
Amount at Which Shown in the Balance Sheet 3,146  
Other investments    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 10,924  
Fair Value 10,924  
Amount at Which Shown in the Balance Sheet $ 10,924