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Schedule I (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Other Investments $ 6,062 $ 5,277
Cost or Amortized Cost 106,179  
Fair Value 109,511  
Amount at Which Shown in the Balance Sheet 109,087  
All Related Party [Member]    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Other Investments 147  
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 82,580  
Fair Value 85,488  
Amount at Which Shown in the Balance Sheet 85,488  
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 3,188  
Fair Value 3,283  
Amount at Which Shown in the Balance Sheet 3,283  
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 22,670  
Fair Value 23,707  
Amount at Which Shown in the Balance Sheet 23,707  
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 30,689  
Fair Value 31,791  
Amount at Which Shown in the Balance Sheet 31,791  
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 18,712  
Fair Value 19,192  
Amount at Which Shown in the Balance Sheet 19,192  
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 7,321  
Fair Value 7,515  
Amount at Which Shown in the Balance Sheet 7,515  
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 12,581  
Fair Value 13,005  
Amount at Which Shown in the Balance Sheet 12,581  
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 1,318  
Fair Value 1,347  
Amount at Which Shown in the Balance Sheet 1,318  
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 1,423  
Fair Value 1,485  
Amount at Which Shown in the Balance Sheet 1,423  
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 2,349  
Fair Value 2,468  
Amount at Which Shown in the Balance Sheet 2,349  
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 2,331  
Fair Value 2,396  
Amount at Which Shown in the Balance Sheet 2,331  
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 5,160  
Fair Value 5,309  
Amount at Which Shown in the Balance Sheet 5,160  
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 812  
Fair Value 812  
Amount at Which Shown in the Balance Sheet 812  
Short-term investments    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 4,291  
Fair Value 4,291  
Amount at Which Shown in the Balance Sheet 4,291  
Other investments    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 5,915  
Fair Value 5,915  
Amount at Which Shown in the Balance Sheet $ 5,915