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Summary of Significant Accounting Policies - Computation of Weighted Average Basic and Diluted Shares Outstanding (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Numerator:                      
Net loss attributable to Company $ (14) $ (26) $ (75) $ (122) $ (714) $ (1,362) $ (217) $ (119) $ (237) $ (2,412) $ (769)
Denominator:                      
Basic-weighted average common shares outstanding                 377 376 387
Dilutive effect of employee stock options and other unvested stock awards                 0 0 0
Diluted outstanding shares                 377 376 387
Basic loss attributable to Company per share $ (0.04) $ (0.07) $ (0.20) $ (0.32) $ (1.90) $ (3.62) $ (0.58) $ (0.32) $ (0.63) $ (6.41) $ (1.99)
Diluted loss attributable to Company per share (0.04) (0.07) (0.20) (0.32) (1.90) (3.62) (0.58) (0.32) (0.63) (6.41) (1.99)
Cash dividends per share $ 0.05 $ 0.05 $ 0.05 $ 0.05 $ 0.05 $ 0.05 $ 0.05 $ 0.46 $ 0.20 $ 0.61 $ 1.84