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Subsequent Events (Details)
Mar. 28, 2019
$ / shares
Mar. 14, 2019
Jan. 28, 2019
CLF ( )
Jan. 24, 2019
$ / shares
Jan. 12, 2019
Declaration of dividends          
Disclosure of non-adjusting events after reporting period [line items]          
Proposed dividend per share       $ 352,723,589,646  
Proposed dividend (as a percent)       70.00%  
Capitalization of net distributable income (as a percent)       30.00%  
Provision for minimum dividend, percentage of net distributable profit   60.00%      
Dividend declared and approved, charged to net distributable income $ 352,723,589,646        
Regulatory capital          
Disclosure of non-adjusting events after reporting period [line items]          
Additional basic capital to risk weighted assets (as a percent)         2.50%
Additional basic capital period (in years)         4 years
Incremental additional basic capital to risk weighted assets each year (as a percent)         0.625%
Additional basic capital countercyclical period (in years)         18 months
Additional basic capital to total assets (as a percent)         0.50%
Percentage of credit limit (as a percent)         30.00%
strategic alliance          
Disclosure of non-adjusting events after reporting period [line items]          
Term of strategic alliance with the insurance companies     15 years    
Payment for insurance contracts |     5,367,057