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Earnings Per Share (Narrative) (Details) - 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
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Income (Loss) from Continuing Operations, Per Basic Share $ (0.13) $ 0.27 $ 0.10 $ 0.20 $ 0.29 $ 0.68 $ 0.20 $ (0.07) $ 0.45 $ 1.10 $ 0.38
Income Loss From Continuing Operations Diluted                 $ 306 $ 789 $ 284
Antidilutive securities excluded from computation of earnings per share                 8 6 7
Convertible Debt Securities [Member]                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Antidilutive securities excluded from computation of earnings per share                 15 15 15