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Investments - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule of Investments [Line Items]                        
Variable Interest Entity, Primary Beneficiary, Maximum Loss Exposure, Amount   $ 0       $ 0       $ 0 $ 0  
Maximum exposure to loss for variable interest   3,000       2,600       3,000 2,600  
Securities for Reverse Repurchase Agreements   10       41       10 41  
Income (Loss) from Equity Method Investments                   181 533 $ 630
Equity method investments   4,300               4,300    
Commitments to fund limited partnership and alternative investments   1,900               $ 1,900    
Aggregate investment income from limited partnerships and other alternative investments                   10.00%    
Total assets   76,780       73,008       $ 76,780 73,008  
Total liabilities   61,453       59,332       61,453 59,332  
Total net investment income                   2,305 2,177 2,313
Net income (loss)   771 $ 651 $ 547 $ 535 592 $ 340 $ 444 $ 443 2,504 1,819 2,371
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] | Limited Partner [Member]                        
Schedule of Investments [Line Items]                        
Total assets   308,300       289,900       308,300 289,900  
Total liabilities   44,000       46,800       44,000 46,800  
Total net investment income                   1,200 1,600 2,100
Net income (loss)                   13,000 11,900 46,700
Life and Annuity Insurance Product Line, Run-off Business                        
Schedule of Investments [Line Items]                        
Proceeds from Sale of Equity Method Investments $ 217                      
Equity Method Investment, Realized Gain (Loss) on Disposal $ 46                     $ 46
US Treasury Securities [Member]                        
Schedule of Investments [Line Items]                        
Debt Securities, Available-for-sale, Restricted   7       7       7 7  
Variable Interest Entity, Not Primary Beneficiary [Member]                        
Schedule of Investments [Line Items]                        
Commitments for variable interest   $ 1,700       $ 1,800       $ 1,700 $ 1,800