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Right-of-use assets and Lease liabilities - Maturity of Lease Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of maturity analysis of lease payments [Line Items]    
Total lease liabilities undiscounted $ 488 $ 449
Total lease liabilities 385 341
Not later than one year [member]    
Disclosure of maturity analysis of lease payments [Line Items]    
Total lease liabilities undiscounted 82 73
Total lease liabilities 70 61
Between one and five years [member]    
Disclosure of maturity analysis of lease payments [Line Items]    
Total lease liabilities undiscounted 203 176
Total lease liabilities 168 140
Thereafter [member]    
Disclosure of maturity analysis of lease payments [Line Items]    
Total lease liabilities undiscounted 203 200
Total lease liabilities $ 147 $ 140