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Capital Structure	12 Months Ended
Capital Structure	Dec. 31, 2017
Debt Disclosure [Abstract]
Capital Structure	Capital Structure Debt outstanding All of the Company’s outstanding debt as of December 31, 2017 and 2016 relates to intercompany obligations. These obligations reflect notes due to related parties and are discussed in Note 4. The Company paid $6 million, $15 million and $16 million of interest on debt in 2017, 2016 and 2015, respectively. The Company had $34 million and $56 million of investment-related debt that is reported in other liabilities and accrued expenses as of December 31, 2017 and 2016, respectively. Of the $56 million, $22 million related to a commitment to fund a limited partnership as of December 31, 2016.