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Future policy benefits (Rollforward) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2021
Liability for Future Policy Benefit, Activity [Line Items]          
Balance – beginning of period $ 13,024 $ 4,313      
Beginning balance at original discount rate     $ 13,685 $ 3,991  
Effect of changes in cash flow assumptions     (769) (2)  
Effect of actual variances from expected experience     (41) (54)  
Adjusted beginning of period balance 12,875 3,935      
Issuances 399 113      
Interest accrual 170 73      
Net premiums collected (1) [1] (459) (135)      
Derecognition (lapses) (56)        
Other (including foreign exchange) (32) (8)      
Ending balance at original discount rate 12,961 3,978      
Effect of changes in discount rate assumptions (311) 147      
Balance – end of period 12,650 4,125      
Balance – beginning of period 21,920 10,775      
Beginning balance at original discount rate     23,052 9,402  
Effect of changes in cash flow assumptions     (777) 4  
Effect of actual variances from expected experience     (33) (54)  
Adjusted beginning of period balance 22,242 9,352      
Issuances 395 114      
Interest accrual 242 116      
Benefits payments (476) (150)      
Derecognition (lapses) (58)        
Other (including foreign exchange) 62 42      
Ending balance at original discount rate 22,407 9,390      
Effect of changes in discount rate assumptions (625) 741      
Balance – end of period 21,782 10,131      
Net liability for future policy benefits 9,845 6,778      
Deferred profit liability 937 659      
Net liability for future policy benefits, per consolidated balance sheet 10,782 7,437 10,476   $ 7,652
Less: Reinsurance recoverable on future policy benefits 279 242      
Net liability for future policy benefits, after reinsurance recoverable $ 10,503 $ 7,195      
Weighted average duration (years) 13 years 6 months 14 years 2 months 12 days      
Term Life Insurance | Segment Life [Member]          
Liability for Future Policy Benefit, Activity [Line Items]          
Balance – beginning of period $ 818 $ 422      
Beginning balance at original discount rate     879 397  
Effect of changes in cash flow assumptions     17 0  
Effect of actual variances from expected experience     (3) (9)  
Adjusted beginning of period balance 893 388      
Issuances 36 41      
Interest accrual 29 25      
Net premiums collected (1) [1] (44) (27)      
Derecognition (lapses) (2)        
Other (including foreign exchange) 0 (2)      
Ending balance at original discount rate 912 425      
Effect of changes in discount rate assumptions (62) 6      
Balance – end of period 850 431      
Balance – beginning of period 1,429 921      
Beginning balance at original discount rate     1,556 858  
Effect of changes in cash flow assumptions     20 (5)  
Effect of actual variances from expected experience     (1) (9)  
Adjusted beginning of period balance 1,575 844      
Issuances 36 42      
Interest accrual 32 27      
Benefits payments (46) (21)      
Derecognition (lapses) (2)        
Other (including foreign exchange) (70) 9      
Ending balance at original discount rate 1,525 883      
Effect of changes in discount rate assumptions (135) 7      
Balance – end of period 1,390 890      
Net liability for future policy benefits 540 459      
Deferred profit liability 209 152      
Net liability for future policy benefits, per consolidated balance sheet 749 611     454
Less: Reinsurance recoverable on future policy benefits 143 115      
Net liability for future policy benefits, after reinsurance recoverable $ 606 $ 496      
Weighted average duration (years) 8 years 8 years 3 months 18 days      
Whole Life Insurance | Segment Life [Member]          
Liability for Future Policy Benefit, Activity [Line Items]          
Balance – beginning of period $ 1,546 $ 1,341      
Beginning balance at original discount rate     1,600 1,243  
Effect of changes in cash flow assumptions     (1) (2)  
Effect of actual variances from expected experience     (9) (8)  
Adjusted beginning of period balance 1,590 1,233      
Issuances 50 38      
Interest accrual 15 11      
Net premiums collected (1) [1] (60) (41)      
Derecognition (lapses) 1        
Other (including foreign exchange) 1 (6)      
Ending balance at original discount rate 1,595 1,235      
Effect of changes in discount rate assumptions (40) 46      
Balance – end of period 1,555 1,281      
Balance – beginning of period 4,781 4,785      
Beginning balance at original discount rate     4,973 3,833  
Effect of changes in cash flow assumptions     (1) (2)  
Effect of actual variances from expected experience     (7) (7)  
Adjusted beginning of period balance 4,965 3,824      
Issuances 49 38      
Interest accrual 48 37      
Benefits payments (59) (46)      
Derecognition (lapses) 1        
Other (including foreign exchange) (292) 27      
Ending balance at original discount rate 4,712 3,826      
Effect of changes in discount rate assumptions (98) 568      
Balance – end of period 4,614 4,394      
Net liability for future policy benefits 3,059 3,113      
Deferred profit liability 555 401      
Net liability for future policy benefits, per consolidated balance sheet 3,614 3,514     3,767
Less: Reinsurance recoverable on future policy benefits 30 33      
Net liability for future policy benefits, after reinsurance recoverable $ 3,584 $ 3,481      
Weighted average duration (years) 21 years 2 months 12 days 20 years 1 month 6 days      
Accident and Health Insurance Product Line [Member] | Segment Life [Member]          
Liability for Future Policy Benefit, Activity [Line Items]          
Balance – beginning of period $ 10,618 $ 2,520      
Beginning balance at original discount rate     11,163 2,323  
Effect of changes in cash flow assumptions     (786) 0  
Effect of actual variances from expected experience     (29) (37)  
Adjusted beginning of period balance 10,348 2,286      
Issuances 312 33      
Interest accrual 126 37      
Net premiums collected (1) [1] (349) (64)      
Derecognition (lapses) (54)        
Other (including foreign exchange) (32) 0      
Ending balance at original discount rate 10,415 2,292      
Effect of changes in discount rate assumptions (206) 94      
Balance – end of period 10,209 2,386      
Balance – beginning of period 15,457 4,939      
Beginning balance at original discount rate     16,259 4,589  
Effect of changes in cash flow assumptions     (798) 0  
Effect of actual variances from expected experience     (26) (38)  
Adjusted beginning of period balance 15,435 4,551      
Issuances 309 34      
Interest accrual 160 51      
Benefits payments (368) (83)      
Derecognition (lapses) (56)        
Other (including foreign exchange) 448 6      
Ending balance at original discount rate 15,928 4,547      
Effect of changes in discount rate assumptions (388) 162      
Balance – end of period 15,540 4,709      
Net liability for future policy benefits 5,331 2,323      
Deferred profit liability 160 98      
Net liability for future policy benefits, per consolidated balance sheet 5,491 2,421     2,569
Less: Reinsurance recoverable on future policy benefits 82 61      
Net liability for future policy benefits, after reinsurance recoverable $ 5,409 $ 2,360      
Weighted average duration (years) 10 years 3 months 18 days 10 years 4 months 24 days      
Accident and Health Insurance Product Line [Member] | Overseas General Insurance [Member]          
Liability for Future Policy Benefit, Activity [Line Items]          
Net liability for future policy benefits $ 713 $ 772      
Deferred profit liability 0 0      
Net liability for future policy benefits, per consolidated balance sheet 713 772     773
Less: Reinsurance recoverable on future policy benefits 24 33      
Net liability for future policy benefits, after reinsurance recoverable $ 689 $ 739      
Weighted average duration (years) 5 years 5 years 3 months 18 days      
Insurance, Other | Segment Life [Member]          
Liability for Future Policy Benefit, Activity [Line Items]          
Balance – beginning of period $ 42 $ 30      
Beginning balance at original discount rate     43 28  
Effect of changes in cash flow assumptions     1 0  
Effect of actual variances from expected experience     0 0  
Adjusted beginning of period balance 44 28      
Issuances 1 1      
Interest accrual 0 0      
Net premiums collected (1) [1] (6) (3)      
Derecognition (lapses) (1)        
Other (including foreign exchange) (1) 0      
Ending balance at original discount rate 39 26      
Effect of changes in discount rate assumptions (3) 1      
Balance – end of period 36 27      
Balance – beginning of period 253 130      
Beginning balance at original discount rate     264 122  
Effect of changes in cash flow assumptions     2 11  
Effect of actual variances from expected experience     $ 1 $ 0  
Adjusted beginning of period balance 267 133      
Issuances 1 0      
Interest accrual 2 1      
Benefits payments (3) 0      
Derecognition (lapses) (1)        
Other (including foreign exchange) (24) 0      
Ending balance at original discount rate 242 134      
Effect of changes in discount rate assumptions (4) 4      
Balance – end of period 238 138      
Net liability for future policy benefits 202 111      
Deferred profit liability 13 8      
Net liability for future policy benefits, per consolidated balance sheet 215 119     $ 89
Less: Reinsurance recoverable on future policy benefits 0 0      
Net liability for future policy benefits, after reinsurance recoverable $ 215 $ 119      
Weighted average duration (years) 14 years 6 months 30 years      
[1] Net premiums collected represent the portion of gross premiums collected from policyholders that is used to fund expected benefit.