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Schedule I (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Other Investments $ 7,945 $ 6,062
Cost or Amortized Cost 113,023  
Fair Value 119,407  
Amount at Which Shown in the Balance Sheet 118,550  
All Related Party [Member]    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Other Investments 119  
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 85,168  
Fair Value 90,699  
Amount at Which Shown in the Balance Sheet 90,699  
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 2,471  
Fair Value 2,670  
Amount at Which Shown in the Balance Sheet 2,670  
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 24,588  
Fair Value 26,354  
Amount at Which Shown in the Balance Sheet 26,354  
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 34,081  
Fair Value 36,331  
Amount at Which Shown in the Balance Sheet 36,331  
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 17,456  
Fair Value 18,470  
Amount at Which Shown in the Balance Sheet 18,470  
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 6,572  
Fair Value 6,874  
Amount at Which Shown in the Balance Sheet 6,874  
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 11,653  
Fair Value 12,510  
Amount at Which Shown in the Balance Sheet 11,653  
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 1,392  
Fair Value 1,452  
Amount at Which Shown in the Balance Sheet 1,392  
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 1,288  
Fair Value 1,405  
Amount at Which Shown in the Balance Sheet 1,288  
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 2,150  
Fair Value 2,438  
Amount at Which Shown in the Balance Sheet 2,150  
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 1,999  
Fair Value 2,146  
Amount at Which Shown in the Balance Sheet 1,999  
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 4,824  
Fair Value 5,069  
Amount at Which Shown in the Balance Sheet 4,824  
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 4,027  
Fair Value 4,027  
Amount at Which Shown in the Balance Sheet 4,027  
Short-term investments    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 4,349  
Fair Value 4,345  
Amount at Which Shown in the Balance Sheet 4,345  
Other investments    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 7,826  
Fair Value 7,826  
Amount at Which Shown in the Balance Sheet $ 7,826