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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2020
Text block [abstract]  
Summary of Goodwill
   2020   2019 
   Million   Million 
As of January 1
   35,343    35,343 
Additions
   1    —   
   
 
 
   
 
 
 
As of December 31
   35,344    35,343