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Shareholders' Equity - Accumulated Other Comprehensive Income (Loss) - Components and Changes of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance     $ 25,890      
Other comprehensive income before reclassifications, net of taxes $ (109) $ (47) 49 $ (53) $ (31) $ 21
Amounts reclassified into income, net of taxes 12 7 6 9 11 12
Ending balance 25,472          
AOCI Attributable to Parent            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance (1,716) (1,676) (1,732) (1,535) (1,515) (1,548)
Ending balance (1,813) (1,716) (1,676) (1,579) (1,535) (1,515)
Foreign Currency Translation            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance (1,246) (1,199) (1,244) (1,079) (1,038) (1,078)
Other comprehensive income before reclassifications, net of taxes (114) (48) 46 (53) (41) 40
Amounts reclassified into income, net of taxes 0 0 0 0 0 0
Ending balance (1,360) (1,246) (1,199) (1,132) (1,079) (1,038)
Benefit Plans            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance (541) (549) (557) (548) (559) (571)
Other comprehensive income before reclassifications, net of taxes 0 0 0 0 0 0
Amounts reclassified into income, net of taxes 8 8 8 12 12 12
Ending balance (533) (541) (549) (536) (548) (559)
Cash Flow Hedges            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance 72 72 70 93 84 103
Other comprehensive income before reclassifications, net of taxes 4 0 3 0 9 (19)
Amounts reclassified into income, net of taxes 4 0 (2) (2) (1) 1
Ending balance 80 72 72 90 93 84
Available-for-Sale Debt Securities            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance (1) (1) (1) (1) 0 0
Other comprehensive income before reclassifications, net of taxes 1 0 0 0 (1) 0
Amounts reclassified into income, net of taxes 0 0 0 0 0 0
Ending balance $ 0 $ (1) $ (1) $ (1) $ (1) $ 0