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Quarterly Financial Data (Unaudited) - Summarized Quarterly Results (Detail) - USD ($)
$ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]                      
Revenue $ 2,722 $ 3,306 $ 3,909 $ 4,820 $ 5,709 $ 5,587 $ 5,255 $ 4,889 $ 14,757 $ 21,440 $ 19,221
Gross profit 359 672 855 1,177 1,536 1,528 1,455 1,290 3,063 5,809 5,104
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
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