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General and significant accounting policies (ASU 2018-12 Transition) (Details) - USD ($)
$ in Millions
 3 Months Ended
Jan. 01, 2021
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Reinsurance recoverable on losses and loss expenses [1]   $ (18,141)   $ (18,859)    
Reinsurance recoverable on policy benefits [1]   (279)   (302)    
Deferred policy acquisition costs   6,296   6,031    
Value of business acquired   (3,603)   (3,702)    
Prepaid reinsurance premiums   (3,166)   (3,136)    
Investments in partially-owned insurance companies   (3,728)   (2,507)    
Unpaid losses and loss expenses   (75,417) $ (73,196) (75,747) $ (72,330)  
Unearned premiums   (20,261)   (19,713)    
Future policy benefits $ 7,652 10,782 7,437 10,476    
Insurance and reinsurance balances payable   (7,778)   (7,780)    
Deferred tax liabilities   (541)   (377)    
Retained earnings   (50,197)   (48,305)    
Accumulated other comprehensive income (loss) (AOCI)   (8,895)   (10,185)    
Net premiums written   (10,710) (9,189)      
Net premiums earned   (10,142) (8,737)      
Net realized (gains) losses   77 (23)      
Policy benefits   (797) (373)      
Policy acquisition costs   (1,948) (1,719)      
Other (income) expense   (296) (312)      
Income Tax (Expense) Benefit   (384) (353)      
Net income (loss)   (1,892) (1,953)      
Comprehensive income (loss)   3,182 (1,376)      
Liability for Future Policy Benefit, Remeasurement Gain (Loss)   1 (5)      
Market risk benefits   830   800    
Market risk benefits gains (losses)   115 (49)      
Equity in net income of partially-owned entities [2]   (340) (363)      
Increase (Decrease) in Deferred Income Taxes   9 91      
Unpaid losses and loss expenses   (14) 923      
Unearned premiums   591 492      
Future policy benefits   136 21      
Accounts payable, accrued expenses, and other liabilities   (390) (274)      
Reinsurance recoverable   622 (444)      
Increase (Decrease) in Deferred Policy Acquisition Costs   (254) (116)      
Increase (Decrease) in Other Operating Assets and Liabilities, Net   32 (79)      
Other Comprehensive Income (Loss), Tax   (132) 779      
Net Cash Provided by (Used in) Operating Activities   2,251 2,444      
Net cash flows used for investing activities   (570) (995)      
Net Cash Provided by (Used in) Financing Activities   (1,424) (1,306)      
Losses and loss expenses   (5,148) (4,564)      
Current discount rate on future policy benefits   (151) 435      
Instrument-specific credit risk on market risk benefits   (3) 23      
Segment Life [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Net premiums written   (1,293) (576)      
Net premiums earned   (1,264) (542)      
Policy benefits   (712) (311)      
Policy acquisition costs   (273) (133)      
Other (income) expense   (15) (30)      
Losses and loss expenses   (32) (24)      
Overseas General Insurance [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Net premiums written   (3,263) (3,079)      
Net premiums earned   (2,786) (2,628)      
Policy benefits   (110) (93)      
Policy acquisition costs   (713) (679)      
Other (income) expense   (9) 2      
Losses and loss expenses   (1,237) (1,296)      
Term Life Insurance | Segment Life [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Deferred policy acquisition costs   337 269 320 246  
Future policy benefits 454 749 611      
Policy acquisition costs   (24) (16)      
Whole Life Insurance | Segment Life [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Deferred policy acquisition costs   413 337 395 334  
Future policy benefits 3,767 3,614 3,514      
Policy acquisition costs   (5) (5)      
Accident and Health Insurance Product Line [Member] | Segment Life [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Deferred policy acquisition costs   991 744 902 745  
Future policy benefits 2,569 5,491 2,421      
Policy acquisition costs   (30) (25)      
Accident and Health Insurance Product Line [Member] | Overseas General Insurance [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Future policy benefits 773 713 772      
Insurance, Other | Segment Life [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Deferred policy acquisition costs   119 120 121 $ 108  
Future policy benefits 89 215 119      
Policy acquisition costs   $ (5) (5)      
Variable Annuity            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Market risk benefits 1,163          
Previously Reported            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Reinsurance recoverable on losses and loss expenses       (18,901)    
Reinsurance recoverable on policy benefits       (303)    
Deferred policy acquisition costs       5,788    
Value of business acquired       (3,596)    
Prepaid reinsurance premiums       (3,140)    
Investments in partially-owned insurance companies       (2,877)    
Unpaid losses and loss expenses       (76,323)    
Unearned premiums       (20,360)    
Future policy benefits       10,120   $ 6,065 [3]
Insurance and reinsurance balances payable       (7,795)    
Deferred tax liabilities       (292)    
Retained earnings       (48,334)    
Accumulated other comprehensive income (loss) (AOCI)       (10,193)    
Net premiums written     (9,199)      
Net premiums earned     (8,746)      
Net realized (gains) losses     (101)      
Policy benefits     (145)      
Policy acquisition costs     (1,737)      
Other (income) expense     (310)      
Income Tax (Expense) Benefit     (355)      
Net income (loss)     (1,974)      
Comprehensive income (loss)     (1,780)      
Market risk benefits       0    
Market risk benefits gains (losses)     0      
Other Comprehensive Income (Loss), Tax     (812)      
Net Cash Provided by (Used in) Operating Activities     2,440      
Net Cash Provided by (Used in) Financing Activities     (1,302)      
Losses and loss expenses     (4,787)      
Current discount rate on future policy benefits     0      
Instrument-specific credit risk on market risk benefits     0      
Previously Reported | Term Life Insurance | Segment Life [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Future policy benefits [3]           391
Previously Reported | Whole Life Insurance | Segment Life [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Future policy benefits [3]           2,578
Previously Reported | Accident and Health Insurance Product Line [Member] | Segment Life [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Future policy benefits [3]           2,270
Previously Reported | Accident and Health Insurance Product Line [Member] | Overseas General Insurance [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Future policy benefits [3]           754
Previously Reported | Insurance, Other | Segment Life [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Future policy benefits [3]           72
Previously Reported | Variable Annuity            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Market risk benefits           $ 1,138
Effect of Modified Retrospective Application Accounting Standards Update 2018-12            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Reinsurance recoverable on losses and loss expenses       (42)    
Reinsurance recoverable on policy benefits       (1)    
Deferred policy acquisition costs       243    
Value of business acquired       (106)    
Prepaid reinsurance premiums       (4)    
Investments in partially-owned insurance companies       (370)    
Unpaid losses and loss expenses       (576)    
Unearned premiums       (647)    
Future policy benefits       356    
Insurance and reinsurance balances payable       (15)    
Deferred tax liabilities       (85)    
Retained earnings (52)     (29)    
Accumulated other comprehensive income (loss) (AOCI) 1,800     8    
Net premiums written     (10)      
Net premiums earned     (9)      
Net realized (gains) losses     (78)      
Policy benefits     228      
Policy acquisition costs     (18)      
Other (income) expense     (2)      
Income Tax (Expense) Benefit     (2)      
Net income (loss)     (21)      
Comprehensive income (loss)     404      
Liability for Future Policy Benefit, Remeasurement Gain (Loss) 1,587          
Market risk benefits       $ 800    
Market risk benefits gains (losses)     49      
Other Comprehensive Income (Loss), Tax     33      
Net Cash Provided by (Used in) Operating Activities     4      
Net Cash Provided by (Used in) Financing Activities     (4)      
Losses and loss expenses     (223)      
Current discount rate on future policy benefits     435      
Instrument-specific credit risk on market risk benefits     $ 23      
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, before Tax 77          
Effect of Modified Retrospective Application Accounting Standards Update 2018-12 | Term Life Insurance | Segment Life [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Liability for Future Policy Benefit, Remeasurement Gain (Loss) 63          
Effect of Modified Retrospective Application Accounting Standards Update 2018-12 | Whole Life Insurance | Segment Life [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Liability for Future Policy Benefit, Remeasurement Gain (Loss) 1,189          
Effect of Modified Retrospective Application Accounting Standards Update 2018-12 | Accident and Health Insurance Product Line [Member] | Segment Life [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Liability for Future Policy Benefit, Remeasurement Gain (Loss) 299          
Effect of Modified Retrospective Application Accounting Standards Update 2018-12 | Accident and Health Insurance Product Line [Member] | Overseas General Insurance [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Liability for Future Policy Benefit, Remeasurement Gain (Loss) 19          
Effect of Modified Retrospective Application Accounting Standards Update 2018-12 | Insurance, Other | Segment Life [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Liability for Future Policy Benefit, Remeasurement Gain (Loss) 17          
Effect of Modified Retrospective Application Accounting Standards Update 2018-12 | Guaranteed Minimum Death Benefit            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
OCI, Market Risk Benefit, Instrument-Specific Credit Risk, Gain (Loss), before Adjustments and Tax [4] 84          
Market risk benefits gains (losses) $ 59          
[1] Net of valuation allowance for uncollectible reinsurance.
[2] Equity in net income of partially-owned entities includes mark-to-market gains on private equities where we own more than three percent of $242 million and $255 million for the three months ended March 31, 2023 and 2022, respectively. This line item also includes net income of $14 million and $42 million attributable to our investments in Huatai for the three months ended March 31, 2023 and 2022, respectively.
[3] Includes future policy benefits previously included within Unpaid losses on the pre-adoption consolidated balance sheets, primarily certain international A&H business, and excludes deferred profit liability and certain guaranteed minimum death benefits reclassified to Market risk benefits on the post adoption period balance sheets.
[4] Includes $77 million of instrument-specific credit risk allocated from retained earnings to AOCI.