Employee Benefit Benefits and Stock-Based Compensation - Defined Contribution (Details) (401(k) Match Expense, USD $)	12 Months Ended
	Dec. 31, 2013 year	Dec. 31, 2012	Dec. 31, 2011
Schedule of Defined Contribution Plans Disclosures
Defined Contribution Plan, Maximum Annual Contribution Per Employee	$ 17,500
Defined Contribution Plan, Vesting Period (in years)	3
Defined Contribution Plan, Vesting Percentage After Vesting Period	100.00%
Defined Contribution Plan, Cost Recognized	24,000,000	23,000,000	13,000,000
After March 6, 2009
Schedule of Defined Contribution Plans Disclosures
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percentage	100.00%
Defined Contribution Plan, Employer Matching Contribution, Percentage	3.00%
After January 1, 2012
Schedule of Defined Contribution Plans Disclosures
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percentage	100.00%
Defined Contribution Plan, Employer Matching Contribution, Percentage	4.00%
All Other Defined Contribution
Schedule of Defined Contribution Plans Disclosures
Defined Contribution Plan, Cost Recognized	$ 5,000,000	$ 7,000,000	$ 2,000,000