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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

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