Taxes on Income - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of beginning and ending amount of unrecognized tax benefits
Balance at beginning of year	$ 212	$ 221	$ 162
Additions based on tax positions related to the current year	19	23	48
Additions for tax positions of prior years	2	17	20
Reduction for tax positions of prior years	(21)	(32)	(3)
Reduction for settlements	(65)	(5)	(6)
Expiration of applicable statutes of limitations	0	(12)	0
Balance at end of year	$ 147	$ 212	$ 221