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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
Mar. 31, 2025
Dec. 31, 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 $ (47) 49 $ (31) $ 21
Amounts reclassified into income, net of taxes 7 6 11 12
Ending balance 25,241      
AOCI Attributable to Parent        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (1,676) (1,732) (1,515) (1,548)
Ending balance (1,716) (1,676) (1,535) (1,515)
Foreign Currency Translation        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (1,199) (1,244) (1,038) (1,078)
Other comprehensive income before reclassifications, net of taxes (48) 46 (41) 40
Amounts reclassified into income, net of taxes 0 0 0 0
Ending balance (1,246) (1,199) (1,079) (1,038)
Benefit Plans        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (549) (557) (559) (571)
Other comprehensive income before reclassifications, net of taxes 0 0 0 0
Amounts reclassified into income, net of taxes 8 8 12 12
Ending balance (541) (549) (548) (559)
Cash Flow Hedges        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 72 70 84 103
Other comprehensive income before reclassifications, net of taxes 0 3 9 (19)
Amounts reclassified into income, net of taxes 0 (2) (1) 1
Ending balance 72 72 93 84
Available-for-Sale Debt Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (1) (1) 0 0
Other comprehensive income before reclassifications, net of taxes 0 0 (1) 0
Amounts reclassified into income, net of taxes 0 0 0 0
Ending balance $ (1) $ (1) $ (1) $ 0