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Profit per share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Computations of Profit Per Share
Computations of profit per share:
 
 
 
 
 
 
(Dollars in millions except per share data)
 
2018
 
2017
 
2016
Profit (loss) for the period (A) 1 
 
$
6,147

 
$
754

 
$
(67
)
Determination of shares (in millions):
 
 

 
 

 
 

Weighted average number of common shares outstanding (B)
 
591.4

 
591.8

 
584.3

Shares issuable on exercise of stock awards, net of shares assumed to be purchased out of proceeds at average market price
 
8.0

 
7.5

 
—

Average common shares outstanding for fully diluted computation (C) 2,3
 
599.4

 
599.3

 
584.3

Profit (loss) per share of common stock:
 
 

 
 

 
 

Assuming no dilution (A/B)
 
$
10.39

 
$
1.27

 
$
(0.11
)
Assuming full dilution (A/C) 2,3
 
$
10.26

 
$
1.26

 
$
(0.11
)
Shares outstanding as of December 31 (in millions)
 
575.5

 
597.6

 
586.5

1 
Profit (loss) attributable to common shareholders.
2 
Diluted by assumed exercise of stock-based compensation awards using the treasury stock method.
3 
In 2016, the assumed exercise of stock-based compensation awards was not considered because the impact would be antidilutive.