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Personnel expenses (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Personnel Expenses [Line Items]          
Salaries and variable compensation $ 2,945 $ 2,871 $ 2,696 $ 5,816 $ 5,258
Financial advisor compensation [1] 1,183 1,170 941 2,353 2,035
Contractors 98 98 91 196 176
Social security 241 268 228 508 439
Post-employment benefit plans 173 [2] 265 202 439 438
Other personnel expenses 132 128 123 260 258
Total personnel expenses 4,772 $ 4,801 $ 4,283 $ 9,573 $ 8,604
Curtailments $ 59        
[1] <div>Financial advisor compensation consists of grid-based compensation based directly on compensable revenues generated by financial advisors and supplemental compensation calculated on the basis of financial advisor productivity, firm tenure, assets and other variables. It also includes expenses related to compensation commitments with financial advisors entered into at the time of recruitment that are subject to vesting requirements</div>
[2] <div>Includes curtailment gains of USD 59 million, which represent a reduction in the defined benefit obligation related to the Swiss pension plan resulting from a decrease in headcount following restructuring activities.</div>