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Accumulated Other Comprehensive Income (Loss) ("AOCI") - Components of AOCI (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Accumulated other comprehensive income (loss), Beginning balance   $ (150)     $ (150)  
Amounts reclassified from accumulated other comprehensive income (loss)           $ 10
Net current-period other comprehensive income $ 3 1 $ 1 $ 2    
Accumulated other comprehensive income (loss), Ending balance (146)       (146)  
Accumulated Other Comprehensive Income (Loss) [Member]            
Accumulated other comprehensive income (loss), Beginning balance   (150)   (147) (150) (147)
Other comprehensive income (loss) before reclassifications         4 (7)
Amounts reclassified from accumulated other comprehensive income (loss)         0 10
Net current-period other comprehensive income 3 $ 1 1 $ 2 4 3
Accumulated other comprehensive income (loss), Ending balance $ (146)   $ (144)   $ (146) $ (144)