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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Amount |  |  |
U.S. statutory rate applied to income before taxes | $ 2,282 | $ 1,631 | $ 1,890
Differential arising from: |  |  |
Provisional impact of the TCJA | 2,625 | 0 | 0
Impact of purchase accounting adjustments, including amortization | 713 | 623 | 797
Valuation allowances | 632 | (5) | 39
Restructuring | 142 | 145 | 167
State taxes | 77 | 173 | 159
U.S. health care reform legislation | 74 | 68 | 66
Foreign currency devaluation related to Venezuela | 0 | 0 | 321
Foreign earnings | (1,725) | (1,646) | (2,144)
Tax settlements | (356) | 0 | (417)
Unremitted foreign earnings | 0 | (30) | 260
Other | (361) | (241) | (196)
Taxes on income | $ 4,103 | $ 718 | $ 942
Tax Rate |  |  |
U.S. statutory rate applied to income before taxes | 35.00% | 35.00% | 35.00%
Differential arising from: |  |  |
Provisional impact of the TCJA | 40.30% | 0.00% | 0.00%
Impact of purchase accounting adjustments, including amortization | 10.90% | 13.40% | 14.80%
Valuation allowances | 9.70% | (0.10%) | 0.70%
Restructuring | 2.20% | 3.10% | 3.10%
State taxes | 1.20% | 3.70% | 2.90%
U.S. health care reform legislation | 1.10% | 1.40% | 1.20%
Foreign currency devaluation related to Venezuela | 0.00% | 0.00% | 5.90%
Foreign earnings | (26.50%) | (35.30%) | (39.70%)
Tax settlements | (5.50%) | 0.00% | (7.70%)
Unremitted foreign earnings | 0.00% | (0.60%) | 4.80%
Other | (5.50%) | (5.20%) | (3.60%)
Total, Tax Rate | 62.90% | 15.40% | 17.40%

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