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Taxes on Income - Reconciliation Between Effective Tax Rate and US Statutory Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Amount
U.S. statutory rate applied to income before taxes	$ 1,827	$ 2,282	$ 1,631
Differential arising from:
Impact of the TCJA	289	2,625	0
Valuation allowances	269	632	(5)
Impact of purchase accounting adjustments, including amortization	267	713	623
State taxes	201	77	173
Restructuring	56	142	145
Foreign earnings	(245)	(1,654)	(1,546)
R&D tax credit	(96)	(71)	(58)
Tax settlements	(22)	(356)	0
Other	(38)	(287)	(245)
Taxes on income	$ 2,508	$ 4,103	$ 718
Tax Rate
U.S. statutory rate applied to income before taxes	21.00%	35.00%	35.00%
Differential arising from:
Impact of the TCJA	3.30%	40.30%	0.00%
Valuation allowances	3.10%	9.70%	(0.10%)
Impact of purchase accounting adjustments, including amortization	3.10%	10.90%	13.40%
State taxes	2.30%	1.20%	3.70%
Restructuring	0.60%	2.20%	3.10%
Foreign earnings	(2.80%)	(25.40%)	(33.20%)
R&D tax credit	(1.10%)	(1.10%)	(1.30%)
Tax settlements	(0.30%)	(5.50%)	0.00%
Other	(0.40%)	(4.40%)	(5.20%)
Total, Tax Rate	28.80%	62.90%	15.40%

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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