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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
12 Months Ended
May 02, 2018
Dec. 31, 2018
Derivative [Line Items]    
Gain (Loss) on Contract Termination $ 42  
Document Period End Date   Dec. 31, 2018
Required Annual Distribution of Taxable Net Income   90.00%
Indefinite-lived Intangible Assets, Written off Related to Sale of Business Unit   $ 23