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Stockholders' Equity - Earnings Per Share Reconciliation (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Net income (loss)        
Net income (loss) attributable to common stockholders $ 29 $ (415) $ 150 $ (733)
Income (loss) effect of TEUs (1) (2) (4) (4)
Less distributions on participating securities 1 0 2 0
Basic 27 (417) 144 (737)
Net Income Loss Effect Of Tangible Equity Units Diluted 0 (1) (1) (1)
Diluted $ 27 $ (418) $ 143 $ (738)
Shares        
Average number of common shares outstanding—basic 504 552 511 552
Dilutive effect of stock options 1 0 1 0
Average number of common shares outstanding—diluted 505 552 512 552
Excluded due to anti-dilutive effect 9 11 9 11
Net income (loss) per common share        
Basic (in usd per share) $ 0.05 $ (0.76) $ 0.28 $ (1.34)
Diluted (in usd per share) $ 0.05 $ (0.76) $ 0.28 $ (1.34)