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Goodwill - Summary of Goodwill Identified by Segment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Goodwill [Line Items]    
Goodwill, Beginning balance $ 139 $ 116
Additions 91 23
Goodwill, Ending balance 230 139
United States [Member]    
Goodwill [Line Items]    
Goodwill, Beginning balance 139 116
Additions 91 23
Goodwill, Ending balance 230 139
Canada [Member]    
Goodwill [Line Items]    
Goodwill, Beginning balance 0 0
Additions 0 0
Goodwill, Ending balance 0 0
International [Member]    
Goodwill [Line Items]    
Goodwill, Beginning balance 0 0
Additions 0 0
Goodwill, Ending balance $ 0 $ 0