The Company and Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014 segments	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Number of reportable segments	3
Capitalized software development costs	$ 395,000,000	$ 375,000,000
Amortization of previously capitalized software	277,000,000	228,000,000	184,000,000
Advertising expense	1,300,000,000	1,000,000,000	1,100,000,000
Allowance for doubtful accounts receivable and authorized credits	$ 102,000,000	$ 106,000,000
Stages of delinquency, high (days)	180 days
Days past due, charge off loan	180 days
Bankruptcy charge off timing (days)	60 days
Minimum
Property, Plant and Equipment [Line Items]
Useful lives (years)	1 year
Minimum | Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Useful lives (years)	1 year
Minimum | Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Useful lives (years)	5 years
Minimum | Furniture and Fixtures and Vehicles [Member]
Property, Plant and Equipment [Line Items]
Useful lives (years)	3 years
Maximum
Property, Plant and Equipment [Line Items]
Useful lives (years)	8 years
Maximum | Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Useful lives (years)	3 years
Maximum | Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Useful lives (years)	30 years
Maximum | Aviation Equipment [Member]
Property, Plant and Equipment [Line Items]
Useful lives (years)	10 years