Taxes on Income - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Measurement period adjustment, income tax expense (benefit)		$ 149
Transition tax for accumulated foreign earnings, income tax expense (benefit)		173
Change in tax rate, income tax expense (benefit)		(24)
Undistributed earnings of foreign subsidiaries for income tax purposes		780
Net income tax payments		709	$ 683	$ 260
Operating loss carryforwards		564
Total amount of federal, state and local, and foreign unrecognized tax benefits excluding interest and penalties		212	221	162	$ 155
Decrease in unrecognized tax benefits		4
Accrued interest and penalties associated with uncertain tax positions		59	44
Decrease in amount of unrecognized tax benefits from settlements		$ 5	$ 6	$ 18
Forecast | Maximum
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Decrease in amount of unrecognized tax benefits from settlements	$ 60