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Insurance Liabilities - Policyholder contract deposit (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2021
Dec. 31, 2020
Policyholder Account Balance [Roll Forward]            
Policyholder contract deposits account balance, beginning of year $ 158,494 $ 152,809 $ 152,809 $ 148,924    
Issuances 6,821 5,206 21,775 20,357    
Deposits received 389 402 1,573 1,590    
Policy charges (771) (735) (3,036) (3,005)    
Surrenders and withdrawals (5,666) (3,471) (15,042) (15,037)    
Benefit payments (1,897) (1,791) (7,666) (8,927)    
Net transfers from (to) separate account 1,762 1,145 4,536 4,340    
Interest credited 883 984 3,564 4,594    
Other (12) (31) (19) (27)    
Policyholder contract deposits account balance, end of period 160,003 154,518 158,494 152,809    
Other reconciling items (1,978) (2,071) (2,436) (1,264)    
Policyholder Contract Deposit 158,025 152,447 156,058 151,545 $ 148,421 $ 148,421
Cash surrender value 139,467 136,851 138,320 136,372    
As Previously Reported            
Policyholder Account Balance [Roll Forward]            
Policyholder Contract Deposit     158,966 156,846 $ 154,892 154,892
Adjustment for the reclassification of the embedded derivative liability to market risk benefits, net of the host adjustment(s)            
Policyholder Account Balance [Roll Forward]            
Policyholder Contract Deposit           (6,471)
Individual Retirement            
Policyholder Account Balance [Roll Forward]            
Policyholder contract deposits account balance, beginning of year 89,554 84,097 84,097 80,012    
Issuances 4,863 3,896 15,175 13,760    
Deposits received 1 3 11 14    
Policy charges (244) (185) (870) (781)    
Surrenders and withdrawals (3,171) (1,994) (8,921) (8,863)    
Benefit payments (1,036) (1,017) (3,798) (4,031)    
Net transfers from (to) separate account 728 529 2,248 1,531    
Interest credited 377 500 1,608 2,444    
Other (2) 2 4 11    
Policyholder contract deposits account balance, end of period 91,070 85,831 89,554 84,097    
Other reconciling items (1,889) (1,859) (2,136) (1,289)    
Policyholder Contract Deposit $ 89,181 $ 83,972 $ 87,418 $ 82,808   79,203
Weighted average crediting rate 2.52% 2.36% 2.43% 2.42%    
Cash surrender value $ 84,906 $ 80,438 $ 83,278 $ 79,787    
Individual Retirement | As Previously Reported            
Policyholder Account Balance [Roll Forward]            
Policyholder Contract Deposit           85,097
Individual Retirement | Adjustment for the reclassification of the embedded derivative liability to market risk benefits, net of the host adjustment(s)            
Policyholder Account Balance [Roll Forward]            
Policyholder Contract Deposit           (5,894)
Group Retirement            
Policyholder Account Balance [Roll Forward]            
Policyholder contract deposits account balance, beginning of year 43,395 43,902 43,902 43,406    
Issuances 1,320 1,152 4,927 5,124    
Deposits received 6 8 19 22    
Policy charges (110) (127) (462) (523)    
Surrenders and withdrawals (2,016) (1,396) (5,712) (5,795)    
Benefit payments (557) (544) (2,528) (2,329)    
Net transfers from (to) separate account 592 616 2,149 2,750    
Interest credited 270 277 1,100 1,249    
Other 3 (1) 0 (2)    
Policyholder contract deposits account balance, end of period 42,903 43,887 43,395 43,902    
Other reconciling items (279) (330) (319) (259)    
Policyholder Contract Deposit $ 42,624 $ 43,557 $ 43,076 $ 43,643   43,228
Weighted average crediting rate 2.78% 2.71% 2.77% 2.79%    
Cash surrender value $ 41,361 $ 43,193 $ 41,831 $ 43,359    
Group Retirement | As Previously Reported            
Policyholder Account Balance [Roll Forward]            
Policyholder Contract Deposit           43,805
Group Retirement | Adjustment for the reclassification of the embedded derivative liability to market risk benefits, net of the host adjustment(s)            
Policyholder Account Balance [Roll Forward]            
Policyholder Contract Deposit           (577)
Life Insurance            
Policyholder Account Balance [Roll Forward]            
Policyholder contract deposits account balance, beginning of year 10,224 10,183 10,183 10,012    
Issuances 49 73 190 225    
Deposits received 365 369 1,484 1,477    
Policy charges (384) (389) (1,570) (1,567)    
Surrenders and withdrawals (56) (45) (211) (212)    
Benefit payments (49) (69) (216) (245)    
Net transfers from (to) separate account (1) 0 (5) (2)    
Interest credited 88 101 377 447    
Other (16) (31) (8) 48    
Policyholder contract deposits account balance, end of period 10,220 10,192 10,224 10,183    
Other reconciling items 116 24 34 117    
Policyholder Contract Deposit $ 10,336 $ 10,216 $ 10,258 $ 10,300   10,286
Weighted average crediting rate 4.24% 4.23% 4.29% 4.28%    
Cash surrender value $ 8,874 $ 8,830 $ 8,866 $ 8,826    
Life Insurance | As Previously Reported            
Policyholder Account Balance [Roll Forward]            
Policyholder Contract Deposit           10,286
Life Insurance | Adjustment for the reclassification of the embedded derivative liability to market risk benefits, net of the host adjustment(s)            
Policyholder Account Balance [Roll Forward]            
Policyholder Contract Deposit           0
Institutional Markets            
Policyholder Account Balance [Roll Forward]            
Policyholder contract deposits account balance, beginning of year 11,734 10,804 10,804 11,351    
Issuances 586 82 1,468 1,230    
Deposits received 9 13 26 42    
Policy charges (17) (17) (69) (65)    
Surrenders and withdrawals (403) (22) (134) (91)    
Benefit payments (167) (72) (775) (1,948)    
Net transfers from (to) separate account 443 3 144 61    
Interest credited 105 61 301 263    
Other 4 (7) (31) (39)    
Policyholder contract deposits account balance, end of period 12,294 10,845 11,734 10,804    
Other reconciling items 74 94 (16) 165    
Policyholder Contract Deposit $ 12,368 $ 10,939 $ 11,718 $ 10,969   11,559
Weighted average crediting rate 3.55% 2.30% 2.71% 2.41%    
Cash surrender value $ 2,545 $ 2,529 $ 2,537 $ 2,520    
Institutional Markets | As Previously Reported            
Policyholder Account Balance [Roll Forward]            
Policyholder Contract Deposit           11,559
Institutional Markets | Adjustment for the reclassification of the embedded derivative liability to market risk benefits, net of the host adjustment(s)            
Policyholder Account Balance [Roll Forward]            
Policyholder Contract Deposit           0
Corporate & Other            
Policyholder Account Balance [Roll Forward]            
Policyholder contract deposits account balance, beginning of year 3,587 3,823 3,823 4,143    
Issuances 3 3 15 18    
Deposits received 8 9 33 35    
Policy charges (16) (17) (65) (69)    
Surrenders and withdrawals (20) (14) (64) (76)    
Benefit payments (88) (89) (349) (374)    
Net transfers from (to) separate account 0 (3) 0 0    
Interest credited 43 45 178 191    
Other (1) 6 16 (45)    
Policyholder contract deposits account balance, end of period 3,516 3,763 3,587 3,823    
Other reconciling items 0 0 1 2    
Policyholder Contract Deposit $ 3,516 $ 3,763 $ 3,588 $ 3,825   4,145
Weighted average crediting rate 4.95% 4.88% 4.91% 4.92%    
Cash surrender value $ 1,781 $ 1,861 $ 1,808 $ 1,880    
Corporate & Other | As Previously Reported            
Policyholder Account Balance [Roll Forward]            
Policyholder Contract Deposit           4,145
Corporate & Other | Adjustment for the reclassification of the embedded derivative liability to market risk benefits, net of the host adjustment(s)            
Policyholder Account Balance [Roll Forward]            
Policyholder Contract Deposit           $ 0