Taxes on Income - Uncertain Tax Positions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
A roll forward of the unrecognized tax benefits related to uncertain income tax positions
Balance at the beginning of the period	$ 80	$ 84	$ 77
Additions based on tax positions related to the current year		14	18
Additions for tax positions of prior years			1
Reductions for tax positions of prior years		(4)
Reductions for settlements			(7)
Reductions due to lapse of statute of limitations	(16)	(10)	(12)
Decrease resulting from foreign currency exchange rates	(1)	(4)
Increase resulting from foreign currency exchange rates			7
Balance at the end of the period	63	80	84
Tax benefit related to uncertain tax positions included in annual provision for income taxes	19	1	3
Amount of unrecognized tax benefits that, if recognized, would reduce tax expense	74
Additional income tax expense related to interest on unrecognized tax benefit	(3)	(1)	(4)
Accrued interest related to unrecognized tax benefit	6	6	7
Accrued penalties related to unrecognized tax benefit	6	$ 9	$ 10
Minimum
A roll forward of the unrecognized tax benefits related to uncertain income tax positions
Amount by which it is reasonably possible that unrecognized tax benefits may decrease within the next 12 months	13
Maximum
A roll forward of the unrecognized tax benefits related to uncertain income tax positions
Amount by which it is reasonably possible that unrecognized tax benefits may decrease within the next 12 months	$ 19