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Summary of Significant Accounting Polices - New Accounting Pronouncements (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Reclassification of stranded tax effects |  | $ 0
Accumulated other comprehensive loss |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Reclassification of stranded tax effects |  | (88)
Accumulated other comprehensive loss | Accounting Standards Update 2018-02 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Reclassification of stranded tax effects | $ (88) |
Retained Income |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Reclassification of stranded tax effects |  | $ 88
Retained Income | Accounting Standards Update 2018-02 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Reclassification of stranded tax effects | $ 88 |

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- Definition Amount of increase (decrease) in accumulated other comprehensive income (AOCI) for reclassification to retained earnings of tax effect from remeasurement of deferred tax pursuant to Tax Cuts and Jobs Act. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL116659650-108580 + Details
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