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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Numerator:                      
Income (loss) from continuing operations                 $ (2,416) $ (767) $ 2,455
Income from discontinued operations                     52
Net income (loss) attributable to Company $ (714) $ (1,362) $ (217) $ (119) $ (1,523) $ 155 $ 289 $ 310 $ (2,412) $ (769) $ 2,502
Denominator:                      
Basic-weighted average common shares outstanding                 376 387 428
Dilutive effect of employee stock options and other unvested stock awards                     2
Diluted outstanding shares                 376 387 430
Basic:                      
Income (loss) from continuing operations                 $ (6.41) $ (1.99) $ 5.73
Income from discontinued operations                     0.12
Net income (loss) attributable to Company $ (1.90) $ (3.62) $ (0.58) $ (0.32) $ (4.06) $ 0.41 $ 0.75 $ 0.76 (6.41) (1.99) 5.85
Diluted:                      
Income (loss) from continuing operations                 (6.41) (1.99) 5.70
Income from discontinued operations                     0.12
Net income (loss) attributable to Company (1.90) (3.62) (0.58) (0.32) (4.06) 0.41 0.74 0.76 (6.41) (1.99) 5.82
Cash dividends per share $ 0.05 $ 0.05 $ 0.05 $ 0.46 $ 0.46 $ 0.46 $ 0.46 $ 0.46 $ 0.61 $ 1.84 $ 1.64