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Insurance and reinsurance contracts - Reinsurance contracts - expected recognition of the CSM (Details) - RI - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) $ (2,854) $ (1,275) $ (681)
Including JVs and associates      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) (2,998) (1,390) (800)
Contractual service margin (CSM)      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) (510) (1,345) (1,330)
Contractual service margin (CSM) | 1 year or less      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) (55) (177)  
Contractual service margin (CSM) | After 1 year to 2 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) (48) (132)  
Contractual service margin (CSM) | After 2 years to 3 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) (45) (103)  
Contractual service margin (CSM) | After 3 years to 4 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) (40) (85)  
Contractual service margin (CSM) | After 4 years to 5 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) (37) (74)  
Contractual service margin (CSM) | After 5 years to 10 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) (125) (268)  
Contractual service margin (CSM) | After 10 years to 15 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) (64) (173)  
Contractual service margin (CSM) | After 15 years to 20 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) (36) (113)  
Contractual service margin (CSM) | After 20 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) (60) (220)  
Contractual service margin (CSM) | Group's share relating to JVs and associates      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) 9 5  
Contractual service margin (CSM) | Group's share relating to JVs and associates | 1 year or less      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) (4) (2)  
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) 2    
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) 2 1  
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) 2 1  
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) 1 1  
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) 5 3  
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) 2 2  
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) 1    
Contractual service margin (CSM) | Group's share relating to JVs and associates | After 20 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) (2) (1)  
Contractual service margin (CSM) | Including JVs and associates      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) (501) (1,340) $ (1,315)
Contractual service margin (CSM) | Including JVs and associates | 1 year or less      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) (59) (179)  
Contractual service margin (CSM) | Including JVs and associates | After 1 year to 2 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) (46) (132)  
Contractual service margin (CSM) | Including JVs and associates | After 2 years to 3 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) (43) (102)  
Contractual service margin (CSM) | Including JVs and associates | After 3 years to 4 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) (38) (84)  
Contractual service margin (CSM) | Including JVs and associates | After 4 years to 5 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) (36) (73)  
Contractual service margin (CSM) | Including JVs and associates | After 5 years to 10 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) (120) (265)  
Contractual service margin (CSM) | Including JVs and associates | After 10 years to 15 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) (62) (171)  
Contractual service margin (CSM) | Including JVs and associates | After 15 years to 20 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) (35) (113)  
Contractual service margin (CSM) | Including JVs and associates | After 20 years      
Insurance/Reinsurance contracts - expected recognition      
Net liabilities (assets) $ (62) $ (221)