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Insurance and reinsurance contracts - Reinsurance contract liabilities - expected cash flows (discounted) (Details) - RI - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Insurance/Reinsurance contracts - expected recognition      
Liabilities $ 536 $ 1,151 $ 1,175
Including JVs and associates      
Insurance/Reinsurance contracts - expected recognition      
Liabilities 558 1,179 1,200
Best estimate liabilities (BEL)      
Insurance/Reinsurance contracts - expected recognition      
Liabilities 423 1,182 1,162
Best estimate liabilities (BEL) | 1 year or less      
Insurance/Reinsurance contracts - expected recognition      
Liabilities 136 820  
Best estimate liabilities (BEL) | After 1 year to 2 years      
Insurance/Reinsurance contracts - expected recognition      
Liabilities 68 58  
Best estimate liabilities (BEL) | After 2 years to 3 years      
Insurance/Reinsurance contracts - expected recognition      
Liabilities 30 54  
Best estimate liabilities (BEL) | After 3 years to 4 years      
Insurance/Reinsurance contracts - expected recognition      
Liabilities 4 26  
Best estimate liabilities (BEL) | After 4 years to 5 years      
Insurance/Reinsurance contracts - expected recognition      
Liabilities 4 4  
Best estimate liabilities (BEL) | After 5 years to 10 years      
Insurance/Reinsurance contracts - expected recognition      
Liabilities 20 (3)  
Best estimate liabilities (BEL) | After 10 years to 15 years      
Insurance/Reinsurance contracts - expected recognition      
Liabilities 8 4  
Best estimate liabilities (BEL) | After 15 years to 20 years      
Insurance/Reinsurance contracts - expected recognition      
Liabilities (6) 5  
Best estimate liabilities (BEL) | After 20 years      
Insurance/Reinsurance contracts - expected recognition      
Liabilities 159 214  
Best estimate liabilities (BEL) | Group's share relating to JVs and associates      
Insurance/Reinsurance contracts - expected recognition      
Liabilities 38 40  
Best estimate liabilities (BEL) | Group's share relating to JVs and associates | 1 year or less      
Insurance/Reinsurance contracts - expected recognition      
Liabilities 11 15  
Best estimate liabilities (BEL) | Group's share relating to JVs and associates | After 1 year to 2 years      
Insurance/Reinsurance contracts - expected recognition      
Liabilities (1)    
Best estimate liabilities (BEL) | Group's share relating to JVs and associates | After 2 years to 3 years      
Insurance/Reinsurance contracts - expected recognition      
Liabilities (1)    
Best estimate liabilities (BEL) | Group's share relating to JVs and associates | After 3 years to 4 years      
Insurance/Reinsurance contracts - expected recognition      
Liabilities (1)    
Best estimate liabilities (BEL) | Group's share relating to JVs and associates | After 4 years to 5 years      
Insurance/Reinsurance contracts - expected recognition      
Liabilities (1)    
Best estimate liabilities (BEL) | Group's share relating to JVs and associates | After 5 years to 10 years      
Insurance/Reinsurance contracts - expected recognition      
Liabilities (1) 1  
Best estimate liabilities (BEL) | Group's share relating to JVs and associates | After 10 years to 15 years      
Insurance/Reinsurance contracts - expected recognition      
Liabilities 1 2  
Best estimate liabilities (BEL) | Group's share relating to JVs and associates | After 15 years to 20 years      
Insurance/Reinsurance contracts - expected recognition      
Liabilities 3 3  
Best estimate liabilities (BEL) | Group's share relating to JVs and associates | After 20 years      
Insurance/Reinsurance contracts - expected recognition      
Liabilities 28 19  
Best estimate liabilities (BEL) | Including JVs and associates      
Insurance/Reinsurance contracts - expected recognition      
Liabilities 461 1,222 $ 1,193
Best estimate liabilities (BEL) | Including JVs and associates | 1 year or less      
Insurance/Reinsurance contracts - expected recognition      
Liabilities 147 835  
Best estimate liabilities (BEL) | Including JVs and associates | After 1 year to 2 years      
Insurance/Reinsurance contracts - expected recognition      
Liabilities 67 58  
Best estimate liabilities (BEL) | Including JVs and associates | After 2 years to 3 years      
Insurance/Reinsurance contracts - expected recognition      
Liabilities 29 54  
Best estimate liabilities (BEL) | Including JVs and associates | After 3 years to 4 years      
Insurance/Reinsurance contracts - expected recognition      
Liabilities 3 26  
Best estimate liabilities (BEL) | Including JVs and associates | After 4 years to 5 years      
Insurance/Reinsurance contracts - expected recognition      
Liabilities 3 4  
Best estimate liabilities (BEL) | Including JVs and associates | After 5 years to 10 years      
Insurance/Reinsurance contracts - expected recognition      
Liabilities 19 (2)  
Best estimate liabilities (BEL) | Including JVs and associates | After 10 years to 15 years      
Insurance/Reinsurance contracts - expected recognition      
Liabilities 9 6  
Best estimate liabilities (BEL) | Including JVs and associates | After 15 years to 20 years      
Insurance/Reinsurance contracts - expected recognition      
Liabilities (3) 8  
Best estimate liabilities (BEL) | Including JVs and associates | After 20 years      
Insurance/Reinsurance contracts - expected recognition      
Liabilities $ 187 $ 233