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Business, Basis of Presentation and Summary of Significant Accounting Policies - Summary Matrix (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2021
Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Premiums, reinsurance and other receivables $ 28,971 $ 17,364   $ 18,169  
Deferred policy acquisition costs and value of business acquired 20,151 19,653 $ 19,806 20,417  
Other assets 11,139 11,025   11,742  
Future policy benefits 196,406 187,222   224,358  
Policyholder account balance 219,269 210,597   211,737  
Other Policy-Related Balances 19,736 18,424   18,032  
Liability 3,179 3,763   7,901  
Deferred income tax liability 927 950   4,723  
Retained earnings 40,146 40,332   31,824  
Accumulated other comprehensive income (loss) $ (19,242) (22,621)   315  
Previously Reported          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Premiums, reinsurance and other receivables   17,461     $ 17,870
Deferred policy acquisition costs and value of business acquired   22,983     16,389
Other assets   11,026     11,685
Future policy benefits   204,228     206,656
Policyholder account balance   203,082     205,176
Other Policy-Related Balances   19,651     17,101
Liability   0     0
Deferred income tax liability   325     11,008
Retained earnings   41,953     36,491
Accumulated other comprehensive income (loss)   $ (27,083)     $ 18,072
Reclassification of carrying amount of contracts and contract features that are market risk benefits          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Premiums, reinsurance and other receivables       (59)  
Deferred policy acquisition costs and value of business acquired       0  
Other assets       0  
Future policy benefits       (1,818)  
Policyholder account balance       (958)  
Other Policy-Related Balances       (72)  
Liability       2,789  
Deferred income tax liability       0  
Retained earnings       0  
Accumulated other comprehensive income (loss)       0  
Adjustments for the difference between previous carrying amount and fair value measurement for market risk benefits          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Premiums, reinsurance and other receivables       (12)  
Deferred policy acquisition costs and value of business acquired       0  
Other assets       0  
Future policy benefits       0  
Policyholder account balance       0  
Other Policy-Related Balances       0  
Liability       5,112  
Deferred income tax liability       (1,079)  
Retained earnings       (4,121)  
Accumulated other comprehensive income (loss)       76  
Removal of related amounts in accumulated other comprehensive income          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Premiums, reinsurance and other receivables       0  
Deferred policy acquisition costs and value of business acquired       4,007  
Other assets       42  
Future policy benefits       (7,911)  
Policyholder account balance       0  
Other Policy-Related Balances       1,043  
Liability       0  
Deferred income tax liability       2,405  
Retained earnings       0  
Accumulated other comprehensive income (loss)       8,512  
Adjustment of future policy benefits to remeasure cohorts where net premiums exceed gross premiums under the modified retrospective approach          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Premiums, reinsurance and other receivables       32  
Deferred policy acquisition costs and value of business acquired       0  
Other assets       0  
Future policy benefits       719  
Policyholder account balance       0  
Other Policy-Related Balances       0  
Liability       0  
Deferred income tax liability       (160)  
Retained earnings       (527)  
Accumulated other comprehensive income (loss)       0  
Effect of remeasurement of future policy benefits to an upper-medium grade discount rate          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Premiums, reinsurance and other receivables       351  
Deferred policy acquisition costs and value of business acquired       0  
Other assets       0  
Future policy benefits       34,119  
Policyholder account balance       0  
Other Policy-Related Balances       0  
Liability       0  
Deferred income tax liability       (7,438)  
Retained earnings       0  
Accumulated other comprehensive income (loss)       (26,330)  
Adjustments for the cumulative effect of adoption on additional insurance assets and liabilities          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Premiums, reinsurance and other receivables       19  
Deferred policy acquisition costs and value of business acquired       0  
Other assets       0  
Future policy benefits       83  
Policyholder account balance       0  
Other Policy-Related Balances       0  
Liability       0  
Deferred income tax liability       (13)  
Retained earnings       (42)  
Accumulated other comprehensive income (loss)       (9)  
Other balance sheet reclassifications upon adoption of the LDTI standard          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Premiums, reinsurance and other receivables       (32)  
Deferred policy acquisition costs and value of business acquired       21  
Other assets       15  
Future policy benefits       (7,490)  
Policyholder account balance       7,519  
Other Policy-Related Balances       (40)  
Liability       0  
Deferred income tax liability       0  
Retained earnings       23  
Accumulated other comprehensive income (loss)       $ (6)