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Management Agreement and Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
May 02, 2018
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Related Party Transactions [Abstract]                        
Gain (Loss) on Contract Termination $ 42                      
Management fees                   $ 0 $ 0 $ 52
Monthly Management Fee Income                   12 16 8
Labor and Related Expense   $ 11 $ 14 $ 10 $ 10 $ 12 $ 10 $ 10 $ 10 45 $ 42 $ 19
Indefinite-lived Intangible Assets, Written off Related to Sale of Business Unit                   $ 23