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Lease liability and Right-of-use assets (Details 6) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Jan. 01, 2019
Disclosure of quantitative information about right-of-use assets [line items]      
Lease liabilities $ 1,949 $ 2,005 $ 1,736
Right-of-use assets 1,677 $ 1,676 $ 1,554
Sale and lease back [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Cash inflow for sale and leaseback 700    
Lease liabilities 96    
Right-of-use assets 37    
Gains or losses from sales leaseback $ 478