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Investments (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Investment [Line Items]      
Fixed maturities, available-for-sale: [1] $ 391,096 $ 353,656  
Assets supporting experience-rated contractholder liabilities 20,646 21,299  
Fair value of collateral 7,729 5,309  
Other invested assets [1] 15,606 14,526  
Consolidated feeder funds’ investments 428 349  
Unaffiliated interest 230 199  
Master funds gross assets 89,313 122,376  
Master funds gross liabilities 86,471 119,697  
Fixed maturities      
Investment [Line Items]      
Gross unrealized losses 1,315 6,391  
Gross unrealized losses of twelve months or more concentrated in various sectors 878 3,283  
Fixed maturities, available-for-sale: 391,096 353,656  
Assets supporting experience-rated contractholder liabilities 18,904 19,706  
Corporate securities      
Investment [Line Items]      
Gross unrealized losses of twelve months or more concentrated in various sectors 878 3,283  
Equity securities      
Investment [Line Items]      
Assets supporting experience-rated contractholder liabilities 1,465 1,378  
Other Income | Equity securities      
Investment [Line Items]      
Unrealized Gain (Loss) on Investments 943 (1,157)  
Other Income | Assets supporting experience-rated contractholder liabilities      
Investment [Line Items]      
Unrealized Gain (Loss) on Investments 996 (778) $ 300
Other Comprehensive Income (Loss) | Equity securities      
Investment [Line Items]      
Unrealized Gain (Loss) on Investments     $ (494)
Investments      
Investment [Line Items]      
Fair value of collateral 1,012 986  
Cash      
Investment [Line Items]      
Fair value of collateral 6,717 4,323  
Carrying value of non-income producing assets      
Investment [Line Items]      
Fixed maturities, available-for-sale: 204    
Assets supporting experience-rated contractholder liabilities 27    
Investment Real Estate $ 1    
California      
Investment [Line Items]      
Commercial mortgage loan, concentration percentage 27.00%    
Texas      
Investment [Line Items]      
Commercial mortgage loan, concentration percentage 9.00%    
New York      
Investment [Line Items]      
Commercial mortgage loan, concentration percentage 8.00%    
Europe      
Investment [Line Items]      
Commercial mortgage loan, concentration percentage 7.00%    
Australia      
Investment [Line Items]      
Commercial mortgage loan, concentration percentage 1.00%    
Asia      
Investment [Line Items]      
Commercial mortgage loan, concentration percentage 1.00%    
NAIC High or Highest Quality Rating | Fixed maturities      
Investment [Line Items]      
Gross unrealized losses $ 973 5,391  
NAIC Other Than High or Highest Quality Rating | Fixed maturities      
Investment [Line Items]      
Gross unrealized losses $ 342 $ 1,000  
[1]
See Note 4 for details of balances associated with variable interest entities.