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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, 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
Reconciliation of Basic and Diluted Earnings per Share of Common Stock                      
Income (loss) from continuing operations                 $ (6,177) $ 578 $ 213
Discontinued operations, net of tax                 0 0 86
Net income (loss)                 $ (6,177) $ 578 $ 299
Weighted average number of basic shares outstanding                 426 422 420
Assumed exercise of dilutive stock options and awards (in shares)                 0 2 1
Weighted average number of diluted shares outstanding                 426 424 421
Earnings (loss) per share:                      
Basic - Continuing Operations, in dollars per share                 $ (14.49) $ 1.37 $ 0.51
Basic - Discontinued Operations, in dollars per share                 0.00 0.00 0.20
Basic - Net Income (Loss), in dollars per share $ (13.44) $ 0.89 $ (2.56) $ 0.78 $ (0.53) $ 0.94 $ 0.44 $ 0.53 (14.49) 1.37 0.71
Diluted earnings (loss) per share:                      
Diluted - Continuing Operations, in dollars per share                 (14.49) 1.37 0.51
Diluted - Discontinued Operations, in dollars per share                 0.00 0.00 0.20
Diluted - Net Income (Loss), in dollars per share $ (13.44) $ 0.89 $ (2.56) $ 0.77 $ (0.53) $ 0.93 $ 0.44 $ 0.53 $ (14.49) $ 1.37 $ 0.71
Shares excluded from the calculation of diluted shares outstanding, in shares                 3 1 2