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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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