Taxes on Income (Loss) (Schedule of Components of Income Before Income Taxes) (Details) - USD ($) $ in Millions	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Domestic													$ (185)	$ 573	$ 334
Foreign													169	106	83
Total	$ (284)	$ 204	$ 123	$ (59)	$ 42	$ 357	$ 206	$ 73	$ 64	$ 279	$ 268	$ 636	$ (16)	$ 679	$ 417