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Taxes on Income (Loss) (Schedule of Components of income Before Income Taxes) (Details) - USD ($)
$ 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
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract]                      
Domestic                 $ 27 $ (193) $ 497
Foreign                 314 170 106
Income (loss) before income taxes $ 49 $ 307 $ 71 $ (86) $ (284) $ 203 $ 121 $ (62) $ 341 $ (23) $ 603