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Financial structure and financial costs - Foreign exchange risk sensitivity (Details)
$ in Millions
Dec. 31, 2019
$ / ₽
Dec. 31, 2019
$ / £
Dec. 31, 2019
$ / €
Dec. 31, 2019
Dec. 31, 2019
USD ($)
Dec. 31, 2018
$ / ₽
Dec. 31, 2018
$ / £
Dec. 31, 2018
$ / €
Dec. 31, 2018
USD ($)
Dec. 31, 2017
$ / ₽
Dec. 31, 2017
$ / £
Dec. 31, 2017
$ / €
Dec. 31, 2017
USD ($)
Sensitivity analysis                          
Shareholders' equity at historical exchange rate         $ 128,281       $ 126,953       $ 119,450
Currency translation adjustment before net investment hedge         (11,501)       (11,321)       (7,908)
Net investment hedge - open instruments         (2)       8       14
Shareholders' equity at exchange rate as of the end of the period         116,778       115,640       111,556
Foreign exchange risk                          
Sensitivity analysis                          
Exchange rates 62.27 0.76 0.89     69.62 0.78 0.87   57.86 0.74 0.83  
Impact on shareholders equity and net income                          
Reasonably possible increase in risk assumption (as a percent)       10.00%                  
Reasonably possible decrease in risk assumption (as a percent)       10.00%                  
Euro                          
Sensitivity analysis                          
Shareholders' equity at historical exchange rate         37,687       41,518       44,930
Currency translation adjustment before net investment hedge         (4,443)       (3,706)       (1,903)
Net investment hedge - open instruments         (2)       8       14
Shareholders' equity at exchange rate as of the end of the period         33,241       37,820       43,041
Euro | Foreign exchange risk                          
Impact on shareholders equity and net income                          
Impact of an increase in exchange rates on shareholders' equity         3,324                
Impact of an increase in exchange rates on net income (Group share)         110                
Impact of a decrease in exchange rates on shareholders' equity         (3,324)                
Impact of a decrease in exchange rates on net income (Group share)         (110)                
U.S. dollar                          
Sensitivity analysis                          
Shareholders' equity at historical exchange rate         66,005       59,125       51,674
Shareholders' equity at exchange rate as of the end of the period         66,005       59,125       51,674
Pound Sterling                          
Sensitivity analysis                          
Shareholders' equity at historical exchange rate         5,635       9,077       6,467
Currency translation adjustment before net investment hedge         (1,830)       (1,960)       (1,543)
Shareholders' equity at exchange rate as of the end of the period         3,805       7,117       4,924
Pound Sterling | Foreign exchange risk                          
Impact on shareholders equity and net income                          
Impact of an increase in exchange rates on shareholders' equity         381                
Impact of an increase in exchange rates on net income (Group share)         95                
Impact of a decrease in exchange rates on shareholders' equity         (381)                
Impact of a decrease in exchange rates on net income (Group share)         (95)                
Ruble                          
Sensitivity analysis                          
Shareholders' equity at historical exchange rate         9,900       8,248       7,366
Currency translation adjustment before net investment hedge         (3,355)       (3,892)       (3,076)
Shareholders' equity at exchange rate as of the end of the period         6,545       4,356       4,290
Ruble | Foreign exchange risk                          
Impact on shareholders equity and net income                          
Impact of an increase in exchange rates on shareholders' equity         654                
Impact of an increase in exchange rates on net income (Group share)         153                
Impact of a decrease in exchange rates on shareholders' equity         (654)                
Impact of a decrease in exchange rates on net income (Group share)         (153)                
Other currencies                          
Sensitivity analysis                          
Shareholders' equity at historical exchange rate         9,054       8,985       9,013
Currency translation adjustment before net investment hedge         (1,873)       (1,763)       (1,386)
Shareholders' equity at exchange rate as of the end of the period         $ 7,182       $ 7,222       $ 7,627