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Changes in Equity and Earnings per Share - Additional Information (Detail)
€ / shares in Units, $ / shares in Units, € in Millions, $ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2020
EUR (€)
shares
Jun. 30, 2019
USD ($)
shares
Jun. 30, 2019
EUR (€)
shares
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2018
$ / shares
Jun. 30, 2020
EUR (€)
shares
Oct. 24, 2019
EUR (€)
€ / shares
Oct. 24, 2018
EUR (€)
€ / shares
Disclosure of classes of share capital [line items]                  
Issued capital $ 1,736       $ 1,736        
Number of shares issued | shares 1,959,000,000   1,957,000,000 1,957,000,000     1,959,000,000    
Dividend declared per share | € / shares               € 0.80 € 0.80
Dividend declared | €               € 1,588 € 1,565
Dividend declared date Oct. 24, 2019 Oct. 24, 2019 Oct. 24, 2018 Oct. 24, 2018          
Dividend proposed per share | $ / shares         $ 0.50 $ 1.00      
Dividend proposed | €   € 1,002   € 1,978          
Dividend paid per share | $ / shares         $ 1.30 $ 1.80      
Dividend paid $ 1,262 € 2,590 $ 2,553 € 3,557          
Profit attributable to equity holders (1,900)   6,055            
Diluted earnings per share based on the profit $ (1,900)   $ 6,055            
Number of antidilutive share options outstanding | shares 72,000,000   64,000,000 64,000,000     72,000,000    
Recycled of cash flow hedge $ 70   $ 64            
Exchange differences on translation of foreign operations (gains/(losses)) (13,025)   1,714            
Australia Divestiture [Member]                  
Disclosure of classes of share capital [line items]                  
Recycled of cash flow hedge $ 370                
Treasury shares [member]                  
Disclosure of classes of share capital [line items]                  
Restricted shares | shares 326,000,000 326,000,000              
OCI reserves [member]                  
Disclosure of classes of share capital [line items]                  
Exchange differences on translation of foreign operations (gains/(losses)) [1] $ (12,293)   $ 1,719            
Top of range [member]                  
Disclosure of classes of share capital [line items]                  
Tax withholding percentage 15.00% 15.00%              
Parent [member]                  
Disclosure of classes of share capital [line items]                  
Issued capital $ 1,736                
Equity shares | shares 48,085,315           48,085,315    
Number of shares authorized | shares 2,019,241,973           2,019,241,973    
Number of shares outstanding | €             € 37    
Parent [member] | Stock Lending Arrangements [Member]                  
Disclosure of classes of share capital [line items]                  
Number of shares issued | shares 30,000,000           30,000,000    
[1] See Note 18 Changes in equity and earning per share.