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Equity (Tables)
12 Months Ended
Dec. 31, 2020
Equity [Abstract]  
Share Repurchases
Total share repurchases were as follows for the respective periods:
(In millions, except per share data)202020192018
Number of shares repurchased— 34 47 
Cash paid for shares repurchased$— $1,950 $3,287 
Average cost per share$— $58.87 $69.46