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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, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Basic earnings (loss) per common share:                
Net income (loss) $ 19 $ 21 $ (8) $ 27 $ 36 $ (194) $ 32 $ (131)
Less income attributable to Series A Preferred Shares (2)     (4)     (4)  
Net income (loss) attributable to common shareholders - basic $ 17     $ 23     $ 28 $ (131)
Weighted average shares outstanding - basic 204,851,780     169,387,541     199,472,387 169,501,289
Basic earnings (loss) per common share $ 0.08     $ 0.14     $ 0.14 $ (0.77)
Diluted earnings (loss) per common share:                
Net income (loss) $ 19 $ 21 $ (8) $ 27 $ 36 $ (194) $ 32 $ (131)
Less income attributable to Series A Preferred Shares (2)     (4)     (4)  
Net income (loss) attributable to common shareholders - diluted $ 17     $ 23     $ 28 $ (131)
Weighted average shares outstanding - basic 204,851,780     169,387,541     199,472,387 169,501,289
Dilutive securities:                
RSUs, warrants and stock options 713,750     4,346,291     1,773,018  
Shares issuable pursuant to the annual Series A Preferred Share dividend 3,821,671     8,299,338     3,547,120  
Weighted average shares outstanding - diluted 209,387,201     182,033,170     204,792,525 169,501,289
Diluted earnings (loss) per common share $ 0.08     $ 0.13     $ 0.14 $ (0.77)