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Effect of New Accounting Standard - Leasing (Details) - Scenario, Forecast [Member] - Accounting Standards Update 2016-02 [Member]
$ in Millions
Jan. 01, 2019
USD ($)
Minimum [Member]  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification $ 85
Maximum [Member]  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification $ 95