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Cash and Cash Equivalents and Short-term Investments	6 Months Ended
Cash and Cash Equivalents and Short-term Investments	Jun. 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 June 30, 2018, Cash and cash equivalents and Short-term investments were $660 million compared to $1,285 million at December 31, 2017, a decrease of $625 million. Of the total balances, $99 million and $96 million were restricted as to their use at June 30, 2018 and December 31, 2017, respectively. Included within the June 30, 2018 and December 31, 2017 balances was £42.7 million ($56.5 million at June 30, 2018 exchange rates and $57.1 million at December 31, 2017 exchange rates) of operating funds required to be held by the Company in the United Kingdom by the Financial Conduct Authority (the “FCA”), a U.K.-based regulator, which were included in Short-term investments.