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Strategic Report - Corporate Centre (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of operating segments [line items]      
Profit before tax $ 17,167 $ 7,112 $ 18,867
Impairment loss (reversal of impairment Loss) 1,769 3,400 3,721
Operating expense 34,884 39,808 39,768
Revenue 51,445 47,966 59,800
Operating Segments, Including Adjustments And Elimination Of Intersegment Amounts      
Disclosure of operating segments [line items]      
Profit before tax 20,990 18,934 18,795
Impairment loss (reversal of impairment Loss) 1,769 2,594 2,579
Operating expense 31,140 30,084 31,457
Revenue 51,524 49,290 50,422
Corporate Centre | Operating Segments, Including Adjustments And Elimination Of Intersegment Amounts      
Disclosure of operating segments [line items]      
Profit before tax 1,700    
Increase (decrease) in profit (loss) before tax $ (400)    
Increase (decrease) in profit (loss) before tax, percent (17.00%)    
Increase (decrease) in revenue/net operating income $ (446)    
Increase (decrease) in revenue/net operating income, percent (27.00%)    
Increase (decrease) In interest expense on debt $ 300    
Increase (decrease) in investment yields (300)    
Increase (decrease) in the fair value of long-term debt and derivatives 100 (300)  
Impairment loss (reversal of impairment Loss) 182 22  
Operating expense 2,100    
Increase (decrease) in operating expenses $ 200    
Increase (decrease) in operating expenses, percent 8.00%    
Increase (decrease) in income from associates $ 55    
Increase (decrease) in income from associates, percent 2.00%    
Revenue $ 1,220 1,666 2,833
Corporate Centre | Central Treasury | Operating Segments, Including Adjustments And Elimination Of Intersegment Amounts      
Disclosure of operating segments [line items]      
Increase (decrease) in revenue/net operating income $ (114)    
Increase (decrease) in revenue/net operating income, percent (8.00%)    
Revenue $ 1,340 1,454 1,760
Corporate Centre | Legacy portfolios | Operating Segments, Including Adjustments And Elimination Of Intersegment Amounts      
Disclosure of operating segments [line items]      
Increase (decrease) in revenue/net operating income $ (716)    
Increase (decrease) in revenue/net operating income, percent (99.00%)    
Revenue $ 8 724 1,233
Corporate Centre | – US run-off portfolio | Operating Segments, Including Adjustments And Elimination Of Intersegment Amounts      
Disclosure of operating segments [line items]      
Increase (decrease) in revenue/net operating income $ (652)    
Increase (decrease) in revenue/net operating income, percent (94.00%)    
Revenue $ 40 692 1,165
Corporate Centre | – Legacy credit | Operating Segments, Including Adjustments And Elimination Of Intersegment Amounts      
Disclosure of operating segments [line items]      
Increase (decrease) in revenue/net operating income $ (64)    
Increase (decrease) in revenue/net operating income, percent (200.00%)    
Revenue $ (32) 32 68
Corporate Centre | Other | Operating Segments, Including Adjustments And Elimination Of Intersegment Amounts      
Disclosure of operating segments [line items]      
Increase (decrease) in revenue/net operating income $ 384    
Increase (decrease) in revenue/net operating income, percent (75.00%)    
Revenue $ (128) $ (512) $ (160)