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Recent Accounting Pronouncements - Effect of Transition Adjustments on Equity due to ASU 2018-12 (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Contractholder funds $ 48,798 $ 40,843    
MRB 315 165 $ 428  
VOBA 1,446 1,615 1,743  
DAC 2,211 1,402 775  
Income tax expense (benefit) 192 439 813  
Adjustment to increase opening retained earnings 6,908 6,116    
Accumulated Other Comprehensive Earnings (Loss)        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Adjustment to increase opening retained earnings $ (2,119) $ (2,870) $ 878 $ 1,331
Cumulative Effect, Period of Adoption, Adjustment        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
MRB       159
VOBA       (22)
DAC       (2)
Income tax expense (benefit)       20
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Contractholder funds       101
MRB       30
FPB       (14)
VOBA       (21)
DAC       (1)
Increase to Equity, gross of tax       95
Adjustment to increase opening retained earnings       75
Cumulative Effect, Period of Adoption, Adjustment | Accumulated Other Comprehensive Earnings (Loss)        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Contractholder funds       115
MRB       (160)
FPB       (159)
VOBA       233
DAC       5
Increase to Equity, gross of tax       34
Income tax expense (benefit)       9
Adjustment to increase opening retained earnings       $ 25