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Consolidated statement of cash flows - additional details - Depreciation, amortization, impairments and fair value adjustments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]      
Depreciation, amortization, impairments and fair value adjustments $ 1,626 $ 1,456 $ 1,622
Property, plant and equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Depreciation, amortization, impairments and fair value adjustments 299 275 241
Right-of-use assets [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Depreciation, amortization, impairments and fair value adjustments 79 66 0
Intangible assets [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Depreciation, amortization, impairments and fair value adjustments 1,245 1,084 1,397
Financial asset [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Depreciation, amortization, impairments and fair value adjustments 5 31 (16)
Other noncurrent assets [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Depreciation, amortization, impairments and fair value adjustments $ (2) $ 0 $ 0