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Schedule I (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Other Investments $ 5,277 $ 4,672
Cost or Amortized Cost 101,697  
Fair Value 100,668  
Amount at Which Shown in the Balance Sheet 100,844  
All Related Party [Member]    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Other Investments 124  
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 79,323  
Fair Value 78,470  
Amount at Which Shown in the Balance Sheet 78,470  
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 4,158  
Fair Value 4,145  
Amount at Which Shown in the Balance Sheet 4,145  
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 21,370  
Fair Value 21,416  
Amount at Which Shown in the Balance Sheet 21,416  
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 27,183  
Fair Value 26,583  
Amount at Which Shown in the Balance Sheet 26,583  
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 15,758  
Fair Value 15,540  
Amount at Which Shown in the Balance Sheet 15,540  
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 10,854  
Fair Value 10,786  
Amount at Which Shown in the Balance Sheet 10,786  
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 13,435  
Fair Value 13,259  
Amount at Which Shown in the Balance Sheet 13,435  
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 1,185  
Fair Value 1,182  
Amount at Which Shown in the Balance Sheet 1,185  
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 1,549  
Fair Value 1,542  
Amount at Which Shown in the Balance Sheet 1,549  
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 2,601  
Fair Value 2,508  
Amount at Which Shown in the Balance Sheet 2,601  
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 2,524  
Fair Value 2,486  
Amount at Which Shown in the Balance Sheet 2,524  
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 5,576  
Fair Value 5,541  
Amount at Which Shown in the Balance Sheet 5,576  
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 770  
Fair Value 770  
Amount at Which Shown in the Balance Sheet 770  
Short-term investments    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 3,016  
Fair Value 3,016  
Amount at Which Shown in the Balance Sheet 3,016  
Other investments    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 5,153  
Fair Value 5,153  
Amount at Which Shown in the Balance Sheet $ 5,153