Taxes on Income - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of beginning and ending amount of unrecognized tax benefits
Balance at beginning of year	$ 118	$ 82	$ 74
Additions based on tax positions related to the current year	22	30	27
Additions for tax positions of prior years	12	33	10
Reduction for tax positions of prior years	(14)	(11)	(9)
Reduction for settlements	(18)	(16)	(20)
Balance at end of year	$ 120	$ 118	$ 82