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General and significant accounting policies (ASU 2018-12 Transition) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jan. 01, 2021
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 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   $ (19,750) [1]   $ (19,750) [1]   $ (18,859) [2]    
Reinsurance recoverable on policy benefits [1],[2]   (315)   (315)   (302)    
Deferred policy acquisition costs   6,856   6,856   6,031    
Value of business acquired   (3,675)   (3,675)   (3,702)    
Prepaid reinsurance premiums   (3,514)   (3,514)   (3,136)    
Investments in partially-owned insurance companies   (188)   (188)   (2,507)    
Unpaid losses and loss expenses   (79,705) $ (75,336) (79,705) $ (75,336) (75,747) $ (72,330)  
Unearned premiums   (22,684)   (22,684)   (19,713)    
Future policy benefits $ 7,652 13,109 9,906 13,109 9,906 10,476    
Market risk benefits   770   770   800    
Insurance and reinsurance balances payable   (8,481)   (8,481)   (7,780)    
Deferred tax liabilities   (759)   (759)   (377)    
Retained earnings   (51,510)   (51,510)   (48,305)    
Accumulated other comprehensive income (loss) (AOCI)   (11,518)   (11,518)   (10,185)    
Net premiums written   (13,104) (12,012) (35,765) (31,494)      
Net premiums earned   (12,674) (11,530) (33,815) (29,816)      
Net realized (gains) losses   103 456 484 936      
Market risk benefits gains (losses)   32 (69) 154 (85)      
Losses and loss expenses   (7,106) (7,063) (17,937) (16,833)      
Policy benefits   (938) (707) (2,565) (1,441)      
Policy acquisition costs   (2,178) (1,970) (6,142) (5,415)      
Other (income) expense   (154) 202 (550) (9)      
Income Tax (Expense) Benefit   (413) (263) (1,189) (907)      
Net income (loss)   (2,043) (792) (5,728) (3,935)      
Current discount rate on future policy benefits   683 479 497 1,546      
Instrument-specific credit risk on market risk benefits   (5) 8 3 48      
Other Comprehensive Income (Loss), Tax   0 109 (104) 1,071      
Comprehensive income (loss)   268 (2,658) 4,316 (7,107)      
Comprehensive income (loss)   347 (2,658) 4,395 (7,107)      
Net Cash Provided by (Used in) Operating Activities       9,446 8,600      
Net Cash Provided by (Used in) Financing Activities       (3,325) (2,730)      
Liability for Future Policy Benefit, Remeasurement Gain (Loss)   25 17 21 11      
Equity in net income of partially-owned entities   (150) 111 (610) (180)      
Increase (Decrease) in Deferred Income Taxes       39 55      
Unpaid losses and loss expenses       3,270 4,805      
Unearned premiums       2,085 1,904      
Future policy benefits       570 117      
Accounts payable, accrued expenses, and other liabilities       (392) 337      
Reinsurance recoverable       (388) (1,850)      
Increase (Decrease) in Deferred Policy Acquisition Costs       (832) (355)      
Increase (Decrease) in Other Operating Assets and Liabilities, Net       796 (95)      
Net cash flows used for investing activities       (5,434) (5,202)      
Segment Life [Member]                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Net premiums written   (1,452) (1,265) (4,015) (2,403)      
Net premiums earned   (1,442) (1,244) (3,962) (2,325)      
Losses and loss expenses   (20) (27) (87) (78)      
Policy benefits   (866) (666) (2,283) (1,275)      
Policy acquisition costs   (279) (266) (829) (537)      
Other (income) expense   (28) 4 (69) (38)      
Overseas General Insurance [Member]                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Net premiums written   (3,211) (2,645) (9,359) (8,364)      
Net premiums earned   (3,311) (2,741) (9,005) (8,065)      
Losses and loss expenses   (1,635) (1,333) (4,139) (3,772)      
Policy benefits   (91) (108) (338) (282)      
Policy acquisition costs   (827) (720) (2,286) (2,096)      
Other (income) expense   (10) (2) (29) 3      
Term Life Insurance | Segment Life [Member]                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Deferred policy acquisition costs   372 299 372 299 320 246  
Future policy benefits 454 947 740 947 740      
Policy acquisition costs       (74) (56)      
Whole Life Insurance | Segment Life [Member]                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Deferred policy acquisition costs   488 350 488 350 395 334  
Future policy benefits 3,767 6,702 4,004 6,702 4,004      
Policy acquisition costs       (16) (14)      
Accident and Health Insurance Product Line [Member] | Segment Life [Member]                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Deferred policy acquisition costs   1,181 819 1,181 819 902 745  
Future policy benefits 2,569 4,072 4,335 4,072 4,335      
Policy acquisition costs       (100) (72)      
Accident and Health Insurance Product Line [Member] | Overseas General Insurance [Member]                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Future policy benefits 773 718 735 718 735      
Insurance, Other | Segment Life [Member]                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Deferred policy acquisition costs   127 117 127 117 121 $ 108  
Future policy benefits 89 $ 670 92 670 92      
Policy acquisition costs       $ (15) (16)      
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]
Market risk benefits           0    
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     (12,020)   (31,521)      
Net premiums earned     (11,535)   (29,838)      
Net realized (gains) losses     384   787      
Market risk benefits gains (losses)     0   0      
Losses and loss expenses     (7,279)   (17,474)      
Policy benefits     (486)   (790)      
Policy acquisition costs     (1,975)   (5,451)      
Other (income) expense     188   (21)      
Income Tax (Expense) Benefit     (265)   (913)      
Net income (loss)     (812)   (4,001)      
Current discount rate on future policy benefits     0   0      
Instrument-specific credit risk on market risk benefits     0   0      
Other Comprehensive Income (Loss), Tax     (165)   (1,222)      
Comprehensive income (loss)     (3,093)   (8,529)      
Net Cash Provided by (Used in) Operating Activities         8,592      
Net Cash Provided by (Used in) Financing Activities         (2,722)      
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    
Market risk benefits           800    
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     (8)   (27)      
Net premiums earned     (5)   (22)      
Net realized (gains) losses     (72)   (149)      
Market risk benefits gains (losses)     69   85      
Losses and loss expenses     (216)   (641)      
Policy benefits     221   651      
Policy acquisition costs     (5)   (36)      
Other (income) expense     14   12      
Income Tax (Expense) Benefit     (2)   (6)      
Net income (loss)     (20)   (66)      
Current discount rate on future policy benefits     479   1,546      
Instrument-specific credit risk on market risk benefits     8   48      
Other Comprehensive Income (Loss), Tax     56   151      
Comprehensive income (loss)     $ 435   1,422      
Net Cash Provided by (Used in) Operating Activities         8      
Net Cash Provided by (Used in) Financing Activities         $ (8)      
Liability for Future Policy Benefit, Remeasurement Gain (Loss) 1,587              
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]                
Market risk benefits gains (losses) 59              
OCI, Market Risk Benefit, Instrument-Specific Credit Risk, Gain (Loss), before Adjustments and Tax [4] $ 84              
[1] Net of valuation allowance for uncollectible reinsurance.
[2] Net of valuation allowance for uncollectible reinsurance.
[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.