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Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
AOCI roll forward        
Beginning balance $ 9,202 $ 7,451 $ 8,254 $ 6,896
Other comprehensive income (loss), net of tax (40) (3) 84 (39)
Ending balance 9,520 7,972 9,520 7,972
Accumulated Other Comprehensive Income (Loss) [Member]        
AOCI roll forward        
Beginning balance 9 (73) (115) (37)
Other comprehensive income (loss) before reclassifications, net of tax expense (benefit)     88  
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax (expense) benefit     (4)  
Other comprehensive income (loss), net of tax (40) (3) 84 (39)
Ending balance (31) $ (76) (31) $ (76)
Derivative Instruments [Member]        
AOCI roll forward        
Beginning balance     44  
Other comprehensive income (loss) before reclassifications, net of tax expense (benefit)     (3)  
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax (expense) benefit     (4)  
Other comprehensive income (loss), net of tax     (7)  
Ending balance 37   37  
Other comprehensive income (loss) before reclassifications, tax     0  
Amounts reclassified from accumulated other comprehensive (income) loss, tax     (1)  
Available-for-Sale Securities [Member]        
AOCI roll forward        
Beginning balance     15  
Other comprehensive income (loss) before reclassifications, net of tax expense (benefit)     13  
Other comprehensive income (loss), net of tax     13  
Ending balance 28   28  
Other comprehensive income (loss) before reclassifications, tax     5  
Amounts reclassified from accumulated other comprehensive (income) loss, tax     0  
Foreign Currency Translation Adjustments [Member]        
AOCI roll forward        
Beginning balance     (179)  
Other comprehensive income (loss) before reclassifications, net of tax expense (benefit)     78  
Other comprehensive income (loss), net of tax     78  
Ending balance (101)   (101)  
Other comprehensive income (loss) before reclassifications, tax     0  
Amounts reclassified from accumulated other comprehensive (income) loss, tax     0  
Post - Retirement Benefit Obligations [Member]        
AOCI roll forward        
Beginning balance     5  
Ending balance $ 5   5  
Other comprehensive income (loss) before reclassifications, tax     0  
Amounts reclassified from accumulated other comprehensive (income) loss, tax     $ 0