Taxes on Income (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of beginning and ending amount of unrecognized tax benefits
Balance at beginning of year	$ 58	$ 53	$ 37
Additions based on tax positions related to the current year	14	12	14
Additions for tax positions of prior years	3	3	10
Reduction for tax positions of prior years	(1)	(10)	(8)
Balance at end of year	$ 74	$ 58	$ 53