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Financial Instruments Risks - Progress of LtSCD ratios (Detail)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Table Of The Progress Of LtSCD Ratios [Line Items]    
LtSCD 58.00% 58.10%
Bottom of range [member]    
Table Of The Progress Of LtSCD Ratios [Line Items]    
LtSCD 54.60% 52.70%
Weighted average [member]    
Table Of The Progress Of LtSCD Ratios [Line Items]    
LtSCD 58.60% 57.70%
Top of range [member]    
Table Of The Progress Of LtSCD Ratios [Line Items]    
LtSCD 62.80% 61.80%