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Earnings (Loss) Per Share - Summary of Computation Earnings (Loss) Per Common Share Using Two Class Method (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Basic earnings (loss) per common share:                
Net income (loss) $ 27 $ 36 $ (194) $ 12 $ 53 $ 21 $ (131) $ 86
Less income attributable to Preferred Shares (4)              
Net income (loss) attributable to common shareholders - basic $ 23           $ (131)  
Weighted average shares outstanding - basic 169,387,541           169,501,289  
Basic earnings (loss) per common share $ 0.14           $ (0.77)  
Diluted earnings (loss) per common share:                
Net income (loss) $ 27 $ 36 $ (194) $ 12 $ 53 $ 21 $ (131) $ 86
Less income attributable to Preferred Shares (4)              
Net income (loss) attributable to common shareholders - diluted $ 23           $ (131)  
Weighted average shares outstanding - basic 169,387,541           169,501,289  
Dilutive securities                
RSUs, warrants and stock options 4,346,291            
Shares issuable upon conversion of Preferred Shares              
Shares issuable pursuant to the annual Preferred Share dividend 8,299,338            
Weighted average shares outstanding - diluted 182,033,170           169,501,289  
Diluted earnings (loss) per common share $ 0.13           $ (0.77)