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Earnings per Share (Table)
 9 Months Ended
Sep. 30, 2021
Earnings Per Share Reconciliation [Abstract]  
Earnings per share reconciliation [Table Text Block]
The following is a reconciliation of the income and share data used in the basic and diluted earnings per share computations for the periods presented:
 Three Months Ended
September 30,		Nine Months Ended
September 30,
(in millions, except per share amounts)2021202020212020
Basic and Diluted  
Net income, as reported$662 $827 $2,329 $1,387 
Participating share-based awards — allocated income(5)(6)(17)(9)
Net income available to common shareholders — basic and diluted$657 $821 $2,312 $1,378 
Common Shares  
Basic  
Weighted average shares outstanding247.7 253.3 250.1 253.5 
Diluted  
Weighted average shares outstanding247.7 253.3 250.1 253.5 
Weighted average effects of dilutive securities — stock options and performance shares
2.4 1.0 2.3 1.0 
Total250.1 254.3 252.4 254.5 
Net Income per Common Share  
Basic$2.65 $3.24 $9.24 $5.44 
Diluted$2.62 $3.23 $9.16 $5.41