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Policyholder Account Balances - Summary of Changes in Policyholder Account Balance (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Policyholder Account Balance [Line Items]          
Beginning balance     $ 15,540    
Net transfers from separate accounts     (2)   $ 1
Interest credited $ 125 $ 126 250 $ 252  
Ending balance 15,047   15,047   15,540
Life Insurance          
Policyholder Account Balance [Line Items]          
Beginning balance     7,460 7,694 7,694
Issuances     0   0
Premiums received     239   500
Policy charges     (302)   (614)
Surrenders and withdrawals     (125)   (272)
Benefit payments     (126)   (215)
Net transfers from separate accounts     0   0
Interest credited     197   388
Other     (2)   (21)
Ending balance $ 7,341   $ 7,341   $ 7,460
Weighted-average crediting rate 3.90%   3.90%   3.90%
Net amount at risk [1] $ 42,187   $ 42,187   $ 42,754
Cash surrender value 4,189   4,189   4,336
Fixed Annuities          
Policyholder Account Balance [Line Items]          
Beginning balance     4,479 5,477 5,477
Issuances     0   0
Premiums received     12   20
Policy charges     (3)   (6)
Surrenders and withdrawals     (296)   (842)
Benefit payments     (173)   (387)
Net transfers from separate accounts     0   0
Interest credited     73   160
Other     21   57
Ending balance $ 4,113   $ 4,113   $ 4,479
Weighted-average crediting rate 2.90%   2.90%   2.80%
Net amount at risk [1] $ 21   $ 21   $ 33
Cash surrender value 3,185   3,185   3,519
Variable Annuities          
Policyholder Account Balance [Line Items]          
Beginning balance     529 $ 610 610
Issuances     0   0
Premiums received     7   14
Policy charges     (2)   (6)
Surrenders and withdrawals     (32)   (66)
Benefit payments     (27)   (80)
Net transfers from separate accounts     (2)   1
Interest credited     2   4
Other     17   52
Ending balance $ 492   $ 492   $ 529
Weighted-average crediting rate 3.30%   3.30%   3.30%
Net amount at risk [1] $ 401   $ 401   $ 479
Cash surrender value $ 492   $ 492   $ 529
[1] The net amount at risk presented for fixed and variable annuity products contains both general and separate accounts, including amounts related to annuitization and other insurance benefits classified as MRBs.