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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Contingency [Line Items] |  |  |
Tax reform, provisional charge |  | $ 275 |
Tax benefit from foreign Supreme Court decision |  |  | $ 30
Tax benefit from prior year tax positions currently being challenged | $ 15 |  |
Accounting Standards Update 2018-02 |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax reform, reclassification from AOCI to retained earnings, tax effect | $ 163 |  |

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- Definition The tax benefit of deductions related to a tax position taken in prior years. These deductions are currently being challenged by the tax authorities either in the lower courts or at the administrative level and, if resolved in the Company’s favor, will result in the Company recording additional tax benefits, including interest. + References No definition available. + Details
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- Definition Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit) + References No definition available. + Details
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- Definition Tax Cuts And Jobs Act Of 2017, Reclassification From AOCI To Retained Earnings, Tax Effect + References No definition available. + Details
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- Definition Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=96869850&loc=d3e28446-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=96869850&loc=d3e28511-109314 + Details
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