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Long-duration insurance contracts - Summary of changes in discounted present values of expected future policy benefits and expected future net premiums (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]    
Balance at June 30 $ 17,500 $ 19,635
Periodic Payment Annuity [Member]    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]    
Balance at beginning of year 11,212 10,640
Balance at beginning of year at original discount rate 11,681 11,549
Effect of actual versus expected experience 4 2
Change in benefits, net (235) (230)
Interest accrual 273 266
Foreign currency effect 15 83
Ending balance at original discount rate 11,738 11,670
Effect of changes in discount rate assumptions (1,360) (850)
Expected future policy benefits at June 30 10,378 10,820
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]    
Balance at June 30 10,378 10,820
Liabilities for future policy benefits at June 30, net of reinsurance recoverables 10,378 10,820
Life and Health [Member]    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]    
Balance at beginning of year 52,665 52,008
Balance at beginning of year at original discount rate 65,871 63,584
Effect of cash flow assumption changes (324) 10
Effect of actual versus expected experience (12,836) (411)
Change in benefits, net (943) (1,346)
Interest accrual 575 852
Foreign currency effect (459) 100
Ending balance at original discount rate 51,884 62,789
Effect of changes in discount rate assumptions (12,739) (12,741)
Expected future policy benefits at June 30 39,145 50,048
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]    
Balance at beginning of year 46,916 46,129
Balance at beginning of year at original discount rate 58,731 56,535
Effect of cash flow assumption changes (326) 18
Effect of actual versus expected experience (11,225) (251)
Change in premiums, net (876) (1,222)
Interest accrual 507 745
Foreign currency effect (436) 83
Ending balance at original discount rate 46,375 55,908
Effect of changes in discount rate assumptions (11,397) (11,383)
Expected future net premiums at June 30 34,978 44,525
Balance at June 30 4,167 5,523
Reinsurance recoverables (49) (1,549)
Liabilities for future policy benefits at June 30, net of reinsurance recoverables $ 4,118 $ 3,974