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Common shares (Tables)
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Change in common shares
Changes in common shares for the periods presented in this report were as follows:
 
Issued and fully paid share capital $0.10 par value each
 
Issued and fully paid share capital $2.00 par value each
 
Treasury shares held by the Company - $2.00 par value each
 
Shares

 
$ millions

 
Shares

 
$ millions

 
Shares

 
$ millions

At January 1, 2017, December 31, 2017 and July 1, 2018 (Predecessor)
—


—


508,763,020


1,017


(4,244,080
)

(9
)
Cancellation of Predecessor Company common stock
—


—

 
(508,763,020
)

(1,017
)

4,244,080

 
9

Successor Company share issuance
100,000,000


10


—


—


—


—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
At July 2, 2018 (Successor)
100,000,000

 
10

 
—

 
—

 
—

 
—

At December 31, 2018 (Successor)
100,000,000

 
10

 
—

 
—

 
—

 
—

RSU share issuance
234,973

 
—

 
—

 
—

 
—

 
—

At December 31, 2019 (Successor)
100,234,973

 
10

 
—

 
—

 
—

 
—