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Insurance and reinsurance contracts - Analysis of portfolio of insurance and reinsurance (RI) contract assets and liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Analysis of insurance portfolios      
Insurance contract assets $ 1,345 $ 1,180  
Reinsurance contract assets 3,390 2,426  
Insurance contract liabilities 147,566 139,840  
Reinsurance contract liabilities 536 1,151  
Insurance      
Analysis of insurance portfolios      
Assets 1,313 1,148 $ 1,106
Liabilities 147,565 139,839 126,239
Net liabilities (assets) 146,252 138,691 125,133
Assets for insurance acquisition cash flows 32 32  
Liabilities for insurance acquisition cash flows 1 1  
Liability (asset) for insurance acquisition cash flows (31) (31)  
Insurance contract assets 1,345 1,180  
Insurance contract liabilities 147,566 139,840  
Insurance contract liabilities (assets) 146,221 138,660  
Insurance | Including JVs and associates      
Analysis of insurance portfolios      
Assets 1,397 1,192 1,139
Liabilities 170,669 161,818 145,342
Net liabilities (assets) 169,272 160,626 144,203
Assets for insurance acquisition cash flows 32 32  
Liabilities for insurance acquisition cash flows 1 1  
Liability (asset) for insurance acquisition cash flows (31) (31)  
Insurance contract assets 1,429 1,224  
Insurance contract liabilities 170,670 161,819  
Insurance contract liabilities (assets) 169,241 160,595  
Insurance | Best estimate liabilities (BEL)      
Analysis of insurance portfolios      
Assets 4,566 3,952 3,540
Liabilities 127,942 120,115 107,582
Net liabilities (assets) 123,376 116,163 104,042
Insurance | Best estimate liabilities (BEL) | Including JVs and associates      
Analysis of insurance portfolios      
Assets 4,799 3,998 3,562
Liabilities 148,867 139,673 124,297
Net liabilities (assets) 144,068 135,675 120,735
Insurance | Risk adjustment for non-financial risk (RA)      
Analysis of insurance portfolios      
Assets (791) (631) (505)
Liabilities 1,655 1,713 1,418
Net liabilities (assets) 2,446 2,344 1,923
Insurance | Risk adjustment for non-financial risk (RA) | Including JVs and associates      
Analysis of insurance portfolios      
Assets (803) (630) (502)
Liabilities 1,940 1,969 1,662
Net liabilities (assets) 2,743 2,599 2,164
Insurance | Contractual service margin (CSM)      
Analysis of insurance portfolios      
Assets (2,462) (2,173) (1,929)
Liabilities 17,968 18,011 17,239
Net liabilities (assets) 20,430 20,184 19,168
Insurance | Contractual service margin (CSM) | Including JVs and associates      
Analysis of insurance portfolios      
Assets (2,599) (2,176) (1,921)
Liabilities 19,862 20,176 19,383
Net liabilities (assets) 22,461 22,352 21,304
RI      
Analysis of insurance portfolios      
Assets 3,390 2,426 1,856
Liabilities 536 1,151 1,175
Net liabilities (assets) (2,854) (1,275) (681)
Reinsurance contract assets 3,390 2,426  
Reinsurance contract liabilities 536 1,151  
Reinsurance contract liabilities (assets) (2,854) (1,275)  
RI | Including JVs and associates      
Analysis of insurance portfolios      
Assets 3,556 2,569 2,000
Liabilities 558 1,179 1,200
Net liabilities (assets) (2,998) (1,390) (800)
Reinsurance contract assets 3,556 2,569  
Reinsurance contract liabilities 558 1,179  
Reinsurance contract liabilities (assets) (2,998) (1,390)  
RI | Best estimate liabilities (BEL)      
Analysis of insurance portfolios      
Assets 2,624 1,175 508
Liabilities 423 1,182 1,162
Net liabilities (assets) (2,201) 7 654
RI | Best estimate liabilities (BEL) | Including JVs and associates      
Analysis of insurance portfolios      
Assets 2,783 1,315 652
Liabilities 461 1,222 1,193
Net liabilities (assets) (2,322) (93) 541
RI | Risk adjustment for non-financial risk (RA)      
Analysis of insurance portfolios      
Assets 99 (84) (39)
Liabilities (44) (21) (44)
Net liabilities (assets) (143) 63 (5)
RI | Risk adjustment for non-financial risk (RA) | Including JVs and associates      
Analysis of insurance portfolios      
Assets 128 (67) (21)
Liabilities (47) (24) (47)
Net liabilities (assets) (175) 43 (26)
RI | Contractual service margin (CSM)      
Analysis of insurance portfolios      
Assets 667 1,335 1,387
Liabilities 157 (10) 57
Net liabilities (assets) (510) (1,345) (1,330)
RI | Contractual service margin (CSM) | Including JVs and associates      
Analysis of insurance portfolios      
Assets 645 1,321 1,369
Liabilities 144 (19) 54
Net liabilities (assets) $ (501) $ (1,340) $ (1,315)