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Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Numerator:    
Net income attributable to common shareowners $ 2,662 $ 4,792
Denominator:    
Weighted average shares 871 867
Vested portion of restricted shares 3 5
Denominator for basic earnings per share 874 872
Effect of dilutive securities:    
Denominator for diluted earnings per share 879 876
Restricted performance units    
Effect of dilutive securities:    
Incremental common shares attributable to share-based payment arrangements 4 3
Stock option plans    
Effect of dilutive securities:    
Incremental common shares attributable to share-based payment arrangements 1 1