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Cash and Cash Equivalents and Short-term Investments	9 Months Ended
Cash and Cash Equivalents and Short-term Investments	Sep. 30, 2018
Cash, Cash Equivalents, and Short-term Investments [Abstract]
Cash and Cash Equivalents and Short-term Investments	Cash and Cash Equivalents and Short-term Investments Cash and cash equivalents include cash balances and all highly liquid instruments with initial maturities of three months or less. Short-term investments consist of money market funds. The estimated fair value of Cash and cash equivalents and Short-term investments approximates their carrying values. At September 30, 2018, Cash and cash equivalents and Short-term investments were $651 million compared to $1,285 million at December 31, 2017, a decrease of $634 million. Of the total balances, $97 million and $96 million were restricted as to their use at September 30, 2018 and December 31, 2017, respectively. Included within the September 30, 2018 and December 31, 2017 balances, respectively, was £42.8 million ($56.4 million at September 30, 2018 exchange rates) and £42.7 million ($57.1 million at December 31, 2017 exchange rates) of operating funds required to be held by the Company in the United Kingdom (the “U.K.”) by the Financial Conduct Authority (the “FCA”), a U.K.-based regulator, which were included in Short-term investments.