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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Numerator:                      
Income (loss) from continuing operations $ (1,522) $ 156 $ 286 $ 313 $ 597 $ 701 $ 609 $ 548 $ (767) $ 2,455 $ 2,181
Income from discontinued operations             11 41   52 147
Net income (loss) attributable to Company $ (1,523) $ 155 $ 289 $ 310 $ 595 $ 699 $ 619 $ 589 $ (769) $ 2,502 $ 2,327
Denominator:                      
Basic-weighted average common shares outstanding                 387 428 426
Dilutive effect of employee stock options and other unvested stock awards                   2 2
Diluted outstanding shares                 387 430 428
Basic:                      
Income (loss) from continuing operations $ (4.06) $ 0.41 $ 0.75 $ 0.76 $ 1.39 $ 1.63 $ 1.42 $ 1.28 $ (1.99) $ 5.73 $ 5.11
Income from discontinued operations             0.03 0.10   0.12 0.35
Net income (loss) attributable to Company (4.06) 0.41 0.75 0.76 1.39 1.63 1.45 1.38 (1.99) 5.85 5.46
Diluted:                      
Income (loss) from continuing operations (4.06) 0.41 0.74 0.76 1.39 1.62 1.42 1.28 (1.99) 5.70 5.09
Income from discontinued operations             0.02 0.09   0.12 0.35
Net income (loss) attributable to Company (4.06) 0.41 0.74 0.76 1.39 1.62 1.44 1.37 (1.99) 5.82 5.44
Cash dividends per share $ 0.46 $ 0.46 $ 0.46 $ 0.46 $ 0.46 $ 0.46 $ 0.46 $ 0.26 $ 1.84 $ 1.64 $ 0.91