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Interest and Other Income (Tables)
 12 Months Ended
Dec. 31, 2020
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Summary Of Interest and Other Income
   2020   2019   2018 
   Million   Million   Million 
Interest income
   11,447    10,065    11,443 
Fair value gains recognized, net
   2,894    5,495    4,442 
   
 
 
   
 
 
   
 
 
 
    14,341    15,560    15,885