Income Taxes (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013
U.S. [Member] | Expiring 2014 - 2020 [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 74
U.S. [Member] | Expiring 2021 - 2025 [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	71
United Kingdom [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 137