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Earnings Per Share
 12 Months Ended
Dec. 31, 2021
Earnings Per Share [Abstract]  
Earnings Per Share Earnings Per Share ("EPS")Accounting policy. The Company computes basic earnings per share using the weighted-average number of unrestricted common and deferred shares outstanding. Diluted earnings per share also includes the dilutive effect of outstanding employee stock options and restricted stock using the treasury stock method and the effect of strategic performance shares.Basic and diluted earnings per share were computed as follows:
202120202019
(Shares in thousands, dollars in millions, except per share amounts)BasicEffect of
Dilution		DilutedBasicEffect of
Dilution		DilutedBasicEffect of
Dilution		Diluted
Shareholders' net income$5,365 $5,365 $8,458 $8,458 $5,104 $5,104 
Shares:
Weighted average337,962 337,962 364,979 364,979 375,919 375,919 
Common stock equivalents3,004 3,004 3,410 3,410 3,898 3,898 
Total shares337,962 3,004 340,966 364,979 3,410 368,389 375,919 3,898 379,817 
EPS$15.87 $(0.14)$15.73 $23.17 $(0.21)$22.96 $13.58 $(0.14)$13.44 
effect was anti-dilutive:
(In millions)202120202019
Anti-dilutive options1.5 4.1 3.5