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Summary of Business Organization, Operations and Significant Accounting Policies - Accounting Standards Implementation (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]  
Right-of-use asset $ 135
Short-term lease liability 37
Long-term lease liability 100
Maximum  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Right-of-use asset 140
Short-term lease liability 42
Long-term lease liability $ 105