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Earnings (Loss) per Share (Table)
 6 Months Ended
Jun. 30, 2020
Earnings Per Share Reconciliation [Abstract]  
Earnings (loss) per share reconciliation [Table Text Block]
The following is a reconciliation of the income (loss) and share data used in the basic and diluted earnings (loss) per share computations for the periods presented:
 Three Months Ended
June 30,		Six Months Ended
June 30,
(in millions, except per share amounts)2020201920202019
Basic and Diluted  
Net income (loss), as reported$(40) $557  $560  $1,353  
Participating share-based awards — allocated income(1) (4) (3) (10) 
Net income (loss) available to common shareholders — basic and diluted
$(41) $553  $557  $1,343  
Common Shares  
Basic  
Weighted average shares outstanding251.6  261.3  253.6  262.1  
Diluted  
Weighted average shares outstanding251.6  261.3  253.6  262.1  
Weighted average effects of dilutive securities — stock options and performance shares
—  2.4  1.1  2.1  
Total251.6  263.7  254.7  264.2  
Net Income (Loss) per Common Share  
Basic$(0.16) $2.11  $2.19  $5.12  
Diluted$(0.16) $2.10  $2.19  $5.08