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Investments, Investment Income and Gains and Losses - Other Long-Term Investments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Other Long Term Investments [Line Items]    
Percentage of the committed amounts expected to be disbursed in the next fiscal year 30.00%  
Other long-term investments   $ 1,901
Other long-term investments, including disposal groups $ 2,403  
Unfunded Commitments 1,954  
Real Estate Entities [Member]    
Other Long Term Investments [Line Items]    
Other long-term investments   679
Other long-term investments, including disposal groups 788  
Unfunded Commitments 551  
Security Partnerships [Member]    
Other Long Term Investments [Line Items]    
Other long-term investments   1,045
Other long-term investments, including disposal groups 1,409  
Unfunded Commitments 1,379  
Other Long Term Investments [Member]    
Other Long Term Investments [Line Items]    
Other long-term investments   $ 177
Other long-term investments, including disposal groups 206  
Unfunded Commitments $ 24