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Common shares (Tables)
 6 Months Ended
Jun. 30, 2019
Equity [Abstract]  
Schedule of share capital
Share capital for the six months ended June 30, 2019 (Successor) and June 30, 2018 (Predecessor) was 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, 2018, March 31, 2018 and June 30, 2018 (Predecessor)
 
—

 
—

 
508,763,020

 
1,017

 
(4,244,080
)
 
(9
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
At January 1, 2019, March 31, 2019 and June 30, 2019 (Successor)
 
100,000,000

 
10

 
—

 
—

 
—

 
—