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Lease liability and Right-of-use assets (Details 4) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Disclosure of maturity analysis of total lease liabilities [line items]      
Lease liabilities $ 2,005 $ 1,949 $ 1,736
Lease liabilities undiscounted 3,507 3,485  
Less current lease liabilities (286) (246)  
Less current lease liabilities undiscounted (338) (295)  
Non-current lease liabilities 1,719 1,703  
Non-current lease liabilities undiscounted 3,169 3,190  
Most material lease with lease term extension 600 600  
Not later than one year [member]      
Disclosure of maturity analysis of total lease liabilities [line items]      
Lease liabilities 286 246  
Lease liabilities undiscounted 338 295  
Later than one year and not later than two years [member]      
Disclosure of maturity analysis of total lease liabilities [line items]      
Lease liabilities 229 202  
Lease liabilities undiscounted 274 246  
Later than two years and not later than three years [member]      
Disclosure of maturity analysis of total lease liabilities [line items]      
Lease liabilities 186 163  
Lease liabilities undiscounted 226 202  
Later than three years and not later than four years [member]      
Disclosure of maturity analysis of total lease liabilities [line items]      
Lease liabilities 148 138  
Lease liabilities undiscounted 183 173  
Later than four years and not later than five years [member]      
Disclosure of maturity analysis of total lease liabilities [line items]      
Lease liabilities 129 119  
Lease liabilities undiscounted 160 150  
Later than five years [member]      
Disclosure of maturity analysis of total lease liabilities [line items]      
Lease liabilities 1,027 1,081  
Lease liabilities undiscounted $ 2,326 $ 2,419