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Derivatives - Narrative (Details)
3 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
swap
Mar. 31, 2020
USD ($)
swap
Dec. 31, 2020
USD ($)
swap
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Derivative Instruments, Gain (Loss) [Line Items]          
Carrying value of collateral received to support purchased call options     $ 351,000,000 $ 577,000,000  
Interest rate swaps | Cash Flow Hedges | Contract termination          
Derivative Instruments, Gain (Loss) [Line Items]          
Number of interest rate swaps expired | swap   1      
Interest rate swaps | Cash Flow Hedges | Contract termination | Great American Life Insurance Company          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, Notional Amount $ 166,000,000 $ 83,000,000      
Number of interest rate swaps terminated | swap 2        
Interest rate swaps | Cash Flow Hedges | Facility closing          
Derivative Instruments, Gain (Loss) [Line Items]          
Number of interest rate swaps terminated | swap 1        
Interest rate swaps | Cash Flow Hedges | Facility closing | Great American Life Insurance Company          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, Notional Amount $ 44,000,000        
Not Designated as Hedging Instrument | Fixed-indexed and variable-indexed annuities (embedded derivative) | Annuity benefits          
Derivative Instruments, Gain (Loss) [Line Items]          
The portion of the change in fair value of the embedded derivative related to the unlocking of actuarial assumptions     $ 240,000,000 181,000,000 $ (44,000,000)
Designated as Hedging Instrument | Interest rate swaps | Cash Flow Hedges | Great American Life Insurance Company          
Derivative Instruments, Gain (Loss) [Line Items]          
Number of interest rate swaps designated and qualifying as a cash flow hedges | swap     9    
Derivative, Notional Amount     $ 1,630,000,000 1,980,000,000  
Gain (loss) reclassified from AOCI into net investment income     40,000,000 3,000,000 $ (3,000,000)
Collateral receivable supporting interest rate swaps     2,000,000 20,000,000  
Designated as Hedging Instrument | Interest rate swaps | Cash Flow Hedges | Other assets | Great American Life Insurance Company          
Derivative Instruments, Gain (Loss) [Line Items]          
Net derivatives, at fair value     102,000,000 50,000,000  
Designated as Hedging Instrument | Interest rate swaps | Cash Flow Hedges | Other liabilities — derivatives | Great American Life Insurance Company          
Derivative Instruments, Gain (Loss) [Line Items]          
Net derivatives, at fair value     $ 0 $ (5,000,000)