XML 91 R64.htm IDEA: XBRL DOCUMENT v3.20.2
Interests in associates and joint ventures - Associates and Joint Ventures Commentary (Details) - USD ($)
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Disclosure of associates [line items]      
Interests in associates and joint ventures $ 24,800,000,000   $ 24,474,000,000
Bank of Communications Co., Limited      
Disclosure of associates [line items]      
Investment's fair value below carrying amount, period 8 years    
Impairment loss $ 0    
The Saudi British Bank      
Disclosure of associates [line items]      
Proportion of ownership interest in associate 29.20% 40.00%  
Impairment loss $ 0