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Insurance and reinsurance contracts - Insurance contracts - expected recognition of the CSM (Details) - Insurance - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) $ 146,252 $ 138,691 $ 125,133
Including JVs and associates      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) 169,272 160,626 144,203
Contractual service margin (CSM)      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) 20,430 20,184 19,168
Contractual service margin (CSM) | 1 year or less      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) 2,092 2,041  
Contractual service margin (CSM) | After 1 year to 2 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) 1,863 1,780  
Contractual service margin (CSM) | After 2 years to 3 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) 1,666 1,586  
Contractual service margin (CSM) | After 3 years to 4 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) 1,495 1,412  
Contractual service margin (CSM) | After 4 years to 5 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) 1,323 1,283  
Contractual service margin (CSM) | After 5 years to 10 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) 4,653 4,604  
Contractual service margin (CSM) | After 10 years to 15 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) 2,988 2,924  
Contractual service margin (CSM) | After 15 years to 20 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) 1,777 1,781  
Contractual service margin (CSM) | After 20 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) 2,573 2,773  
Contractual service margin (CSM) | Group's share relating to JVs and associates      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) 2,031 2,168  
Contractual service margin (CSM) | Group's share relating to JVs and associates | 1 year or less      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) 214 226  
Contractual service margin (CSM) | Group's share relating to JVs and associates | After 1 year to 2 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) 181 190  
Contractual service margin (CSM) | Group's share relating to JVs and associates | After 2 years to 3 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) 156 165  
Contractual service margin (CSM) | Group's share relating to JVs and associates | After 3 years to 4 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) 136 146  
Contractual service margin (CSM) | Group's share relating to JVs and associates | After 4 years to 5 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) 119 127  
Contractual service margin (CSM) | Group's share relating to JVs and associates | After 5 years to 10 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) 436 474  
Contractual service margin (CSM) | Group's share relating to JVs and associates | After 10 years to 15 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) 278 293  
Contractual service margin (CSM) | Group's share relating to JVs and associates | After 15 years to 20 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) 187 195  
Contractual service margin (CSM) | Group's share relating to JVs and associates | After 20 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) 324 352  
Contractual service margin (CSM) | Including JVs and associates      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) 22,461 22,352 $ 21,304
Contractual service margin (CSM) | Including JVs and associates | 1 year or less      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) 2,306 2,267  
Contractual service margin (CSM) | Including JVs and associates | After 1 year to 2 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) 2,044 1,970  
Contractual service margin (CSM) | Including JVs and associates | After 2 years to 3 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) 1,822 1,751  
Contractual service margin (CSM) | Including JVs and associates | After 3 years to 4 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) 1,631 1,558  
Contractual service margin (CSM) | Including JVs and associates | After 4 years to 5 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) 1,442 1,410  
Contractual service margin (CSM) | Including JVs and associates | After 5 years to 10 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) 5,089 5,078  
Contractual service margin (CSM) | Including JVs and associates | After 10 years to 15 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) 3,266 3,217  
Contractual service margin (CSM) | Including JVs and associates | After 15 years to 20 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) 1,964 1,976  
Contractual service margin (CSM) | Including JVs and associates | After 20 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) $ 2,897 $ 3,125