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Taxes on Income - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Balance January 1	$ 1,723	$ 3,494	$ 3,448
Additions related to current year positions	221	146	196
Additions related to prior year positions	142	520	75
Reductions for tax positions of prior years	(73)	(1,038)	(90)
Settlements	(91)	(1,388)	(92)
Lapse of statute of limitations	(29)	(11)	(43)
Balance December 31	$ 1,893	$ 1,723	$ 3,494

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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