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Property, plant and equipment - Summary of power generating assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [Line Items]      
Carbon emission reduction target (%), 2030 50.00%    
Carbon emission reduction target (%), 2050 0.00%    
Net book value $ 63,793 $ 62,007 $ 56,307
Fossil fuels      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Weighted average remaining useful economic life 14 years 16 years  
Land and buildings      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Net book value $ 5,995 $ 6,369 $ 6,403
Land and buildings | Fossil fuels      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Net book value 26 28  
Land and buildings | Renewables      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Net book value 195 202  
Plant and equipment | Fossil fuels      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Net book value 952 1,048  
Plant and equipment | Renewables      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Net book value $ 1,541 $ 1,588