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Recently Issued Accounting Pronouncements (Details) - Subsequent Event - Accounting Standards Update 2016-02
$ in Millions
Jan. 01, 2019
USD ($)
Minimum  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Operating lease, right-of-use asset $ 195
Operating lease, liability 195
Maximum  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Operating lease, right-of-use asset 235
Operating lease, liability $ 235