Income Taxes Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Loss Carryforwards [Line Items]
Decrease in valuation allowance	$ 27,000,000
Adjustment to additional paid-in-capital for income tax benefits attributable to employee stock compensation	74,000,000	33,000,000	36,000,000
Deferred tax liabilities from undistributed foreign earnings	51,000,000	0
Undistributed foreign earnings	3,800,000,000
Benefit realized from tax holiday granted	3,900,000
Unrecognized tax benefits that would impact effective tax rate	141,000,000
Accrued potential interest and penalties	2,000,000	6,000,000
Liability recorded for interest and penalties	27,000,000	23,000,000
U.K. [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	660,000,000
Capital loss carryforwards	270,000,000
U.S. Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	25,000,000
U.S. State [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	412,000,000
Other [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	287,000,000
Capital loss carryforwards	$ 86,000,000