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Quarterly Financial Information - Summary of Selected Unaudited Financial Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Year ended December 31, 2019                      
Revenue (Note 4) $ 335 $ 428 $ 422 $ 376 $ 346 $ 458 $ 433 $ 378 $ 1,560 [1] $ 1,615 [1] $ 1,556
Operating income 23 68 66 31 23 89 49 23 187 183 124
Net income (loss) $ 15 $ 50 $ 34 $ 26 $ 7 $ 69 $ 32 $ 5 $ 126 $ 113 $ (19)
Basic earnings per share $ 0.11 [2] $ 0.36 [2] $ 0.24 [2] $ 0.19 [2] $ 0.05 [2] $ 0.50 [2] $ 0.23 [2] $ 0.04 [2] $ 0.91 $ 0.82 $ (0.14)
Diluted earnings per share $ 0.11 [2] $ 0.36 [2] $ 0.24 [2] $ 0.18 [2] $ 0.05 [2] $ 0.49 [2] $ 0.23 [2] $ 0.04 [2] $ 0.89 $ 0.81 $ (0.14)
[1] Our revenue is recognized primarily at a point in time for all reported segments
[2]

Earnings per share is computed independently for each of the quarters presented. Therefore, the sum of the quarterly earnings per share may not equal the total computed for the year.