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Consolidated Summary of Investments - Other Than Investments in Related Parties (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]    
Amortized Cost $ 60,920 $ 60,173
Cost or Amortized Cost 81,495  
Debt Securities, Available-for-sale 62,608 64,991
Estimated Fair Value 83,181  
Mortgage Loans on Real Estate, Commercial and Consumer, Net 13,694 10,742
Policy loans 1,421 1,523
Real Estate Investments, Net 451 433
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures 1,840 1,669
Other invested assets 3,027 $ 2,507
Fixed Maturity Securities    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 60,920  
Amount at Which Shown on Balance Sheet 62,608  
U.S. government and agency    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Amortized Cost 7,944  
Debt Securities, Available-for-sale 9,095  
Estimated Fair Value 9,095  
State and political subdivision    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Amortized Cost 3,200  
Debt Securities, Available-for-sale 3,597  
Estimated Fair Value 3,597  
Public utilities    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 2,642  
Estimated Fair Value 2,763  
Amount at Which Shown on Balance Sheet 2,763  
Foreign government    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Amortized Cost 1,426  
Debt Securities, Available-for-sale 1,496  
Estimated Fair Value 1,496  
All other corporate bonds    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 29,512  
Estimated Fair Value 29,388  
Amount at Which Shown on Balance Sheet 29,388  
Total bonds    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 44,724  
Estimated Fair Value 46,339  
Amount at Which Shown on Balance Sheet 46,339  
Mortgage-backed and asset-backed securities    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Estimated Fair Value 15,921  
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost 15,855  
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value 15,921  
Redeemable preferred stock    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 341  
Estimated Fair Value 348  
Amount at Which Shown on Balance Sheet 348  
Non-redeemable preferred stock    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 132  
Estimated Fair Value 124  
Amount at Which Shown on Balance Sheet 124  
Industrial, miscellaneous and all other    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 10  
Estimated Fair Value 14  
Amount at Which Shown on Balance Sheet 14  
Public utilities    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 0  
Estimated Fair Value 2  
Amount at Which Shown on Balance Sheet 2  
Equity Securities    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Cost or Amortized Cost 142  
Estimated Fair Value 140  
Amount at Which Shown on Balance Sheet 140  
Mortgage loans    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Estimated Fair Value 13,694  
Policy loans    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Estimated Fair Value 1,421  
Real estate joint ventures    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Estimated Fair Value 451  
Other limited partnership interests    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Estimated Fair Value 1,840  
Other invested assets    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Estimated Fair Value $ 3,027