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Capital Structure	12 Months Ended
Capital Structure	Dec. 31, 2018
Debt Disclosure [Abstract]
Capital Structure	Capital Structure Debt outstanding All of the Company’s outstanding debt as of December 31, 2018 and 2017 relates to intercompany obligations. These obligations reflect notes due to related parties and are discussed in Note 4. The Company paid $5 million, $6 million and $15 million of interest on debt in 2018, 2017 and 2016, respectively. The Company had $62 million and $34 million of investment-related debt that is reported in other liabilities and accrued expenses as of December 31, 2018 and 2017, respectively.