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Organization and Basis of Presentation (Details 2) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of Basic and Diluted Earnings per Share of Common Stock                      
Net income (loss) $ (2,499) $ 396 $ 174 $ 205 $ (5,796) $ 380 $ (1,089) $ 328 $ (1,724) $ (6,177) $ 578
Weighted average number of basic shares outstanding                 444 426 422
Assumed exercise of dilutive stock options and awards (in shares)                 0 0 2
Weighted average number of diluted shares outstanding                 444 426 424
Earnings (loss) per share:                      
Basic earnings (loss) per share of common stock, in dollars per share $ (5.62) $ 0.89 $ 0.39 $ 0.46 $ (13.44) $ 0.89 $ (2.56) $ 0.78 $ (3.88) $ (14.49) $ 1.37
Diluted earnings (loss) per share of common stock, in dollars per share $ (5.62) $ 0.89 $ 0.39 $ 0.46 $ (13.44) $ 0.89 $ (2.56) $ 0.77 $ (3.88) $ (14.49) $ 1.37
Shares excluded from the calculation of diluted shares outstanding, in shares                 3 3 1