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Income Taxes - Reconciliation of US Statutory Federal Tax Rate (Detail)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure Income Tax Reconciliation Of U S Statutory Federal Tax Rate Detail [Line Items]      
US federal statutory rate 21.00% 21.00% 21.00%
Other (2.00%) (2.00%) (2.00%)
Effective income tax rate 19.00% 18.00% 19.00%
Charges And Credits      
Disclosure Income Tax Reconciliation Of U S Statutory Federal Tax Rate Detail [Line Items]      
Charges and credits (See Note 3)   (1.00%)