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Income Tax Expense | 3 Months Ended
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Mar. 31, 2018
Income Tax Disclosure [Abstract] |
Income Tax Expense | Income Tax Expense As a partnership, we are generally not subject to federal income tax and most state income taxes. However, the Partnership conducts certain activities through corporate subsidiaries which are subject to federal and state income taxes. Our effective tax rate differs from the statutory rate primarily due to Partnership earnings that are not subject to U.S. federal and most state income taxes at the Partnership level. A reconciliation of income tax expense from continuing operations at the U.S. federal statutory rate to net income tax expense (benefit) is as follows:
|  | For the Three Months Ended March 31,
|  | 2018 |  | 2017
|  | (in million)
Tax at statutory federal rate (1) |  | $ | (10 | ) |  | $ | (1 | )
Partnership earnings not subject to tax |  | 9 |  |  | (13 | )
Statutory tax rate changes |  | 29 |  |  | — |
Other |  | 3 |  |  | — |
Net income tax expense (benefit) |  | $ | 31 |  |  | $ | (14 | )
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(1) | In December 2017, the “Tax Cuts and Jobs Act” was signed into law. Among other provisions, the highest corporate federal income tax rate was reduced from 35% to 21% for tax years beginning after December 31, 2017.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -URI http://asc.fasb.org/topic&trid=2144680 + Details
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