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Accumulated Other Comprehensive Income (Loss) ("AOCI") - Components of AOCI (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Beginning balance $ 1,161 $ 1,144 $ 1,128 $ 1,099 $ 1,079 $ 1,063 $ 1,128 $ 1,063
Amounts reclassified from accumulated other comprehensive income (loss)               5
Net current-period other comprehensive income (loss) (3) 8 3 10 (2) (4)    
Ending balance 1,185 1,161 1,144 1,118 1,099 1,079 1,185 1,118
Accumulated Other Comprehensive Income (Loss) [Member]                
Beginning balance (142) (150) (153) (151) (149) (145) (153) (145)
Other comprehensive income (loss) before reclassifications             8 (1)
Amounts reclassified from accumulated other comprehensive income (loss)             0 5
Net current-period other comprehensive income (loss) (3) 8 3 10 (2) (4) 8 4
Ending balance $ (145) $ (142) $ (150) $ (141) $ (151) $ (149) $ (145) $ (141)