Taxes on Income - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of beginning and ending amount of unrecognized tax benefits
Balance at beginning of year	$ 120	$ 118	$ 82
Additions based on tax positions related to the current year	35	22	30
Additions for tax positions of prior years	14	12	33
Reduction for tax positions of prior years	(3)	(14)	(11)
Reduction for settlements	(5)	(18)	(16)
Balance at end of year	$ 161	$ 120	$ 118