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Income Taxes Income Taxes - Reconciliation to US Statutory Rate (Details) - USD ($) $ in Millions | 3 Months Ended | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2017 | Dec. 31, 2017 | Aug. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Successor [Member] |  |  |  |  |  |  |
Statutory U.S. federal income tax rate |  |  | 35.00% |  |  |  |
Equity earning effect |  |  | 0.90% |  |  |  |
Lower effective tax rates on international operations - net |  |  | (9.50%) |  |  |  |
Acquisitions, divestitures, and ownership restructuring activities | [1],[2] |  | 15.80% |  |  |  |
U.S. research and development credit |  |  | 0.40% |  |  |  |
Exchange gains/losses | [3] |  | (1.80%) |  |  |  |
Impact of U.S. Tax Reform |  |  | 126.10% |  |  |  |
Excess tax benefits from stock-compensation |  |  | 0.10% |  |  |  |
Tax settlements and expiration of statue of limitations |  |  | 0.00% |  |  |  |
Other, net |  |  | 1.50% |  |  |  |
Effective Income Tax Rate |  |  | 168.50% |  |  |  |
Benefit related to internal legal entity restructuring |  |  | $ 261 |  |  |  |
Predecessor [Member] |  |  |  |  |  |  |
Statutory U.S. federal income tax rate |  |  |  | 35.00% |  | 35.00% | 35.00%
Equity earning effect |  |  |  | (0.50%) |  | (0.80%) | (0.70%)
Lower effective tax rates on international operations - net |  |  |  | (11.40%) |  | (9.20%) | (9.70%)
Acquisitions, divestitures, and ownership restructuring activities | [2] |  |  | 5.20% |  | 1.90% | (0.20%)
U.S. research and development credit |  |  |  | (0.80%) |  | (0.70%) | (1.50%)
Exchange gains/losses | [3] |  |  | (12.90%) |  | 1.90% | 10.20%
Excess tax benefits from stock-compensation | [4] |  |  | (1.70%) |  |  |
Tax settlements and expiration of statue of limitations |  |  |  | (3.80%) | [5] | (1.10%) | (1.50%)
Other, net |  |  |  | (0.80%) |  | (3.50%) | (3.20%)
Effective Income Tax Rate |  |  |  | 8.30% |  | 23.50% | 28.40%
Continuing Operations [Member] | Predecessor [Member] |  |  |  |  |  |  |
Tax benefit related to reduction in company's unrecognized tax benefits |  | $ 53 |  | $ 53 |  |  |
[1] | Includes a net tax benefit of $261 million related to an internal legal entity restructuring associated with the Intended Business Separations.
[2] | See Notes 3 and 4 for additional information.
[3] | Principally reflects the impact of foreign exchange gains and losses on net monetary assets for which no corresponding tax impact is realized. Further information about the company's foreign currency hedging program is included in Note 6 and Note 18 under the heading Foreign Currency Risk.
[4] | Reflects the impact of the adoption of Accounting Standards Update ("ASU") 2016-09, which resulted in the recognition of excess tax benefits related to equity compensation in the (benefit from) provision for income taxes on continuing operations. See Note 2 for additional information.
[5] | The period January 1 through August 31, 2017 includes a tax benefit of $53 million for accrued interest reversals (recorded in sundry income - net).

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