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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenue Recognition, Milestone Method [Line Items]      
Accrual for agency premiums, time lag period 15 months    
Agent commission split rate 76.00% 75.70% 76.10%
Provision for title insurance claim losses as a percentage of title insurance premiums 5.70% 6.20% 7.00%
Average premium accrual impact to pretax earnings, percent of accrued premium (approximately) 11.00%    
Impact on earnings from change in premium accrual $ 5 $ 9 $ 7
Premiums receivable, net of accrued sales commissions 45 55  
Premiums receivable, net 230 276  
Accrued agent commissions $ 185 $ 221  
Home warranty insurance policy, life (in years) 1 year    
Minimum      
Revenue Recognition, Milestone Method [Line Items]      
Premiums, percent reported within 3 months 86.00%    
Premiums, percent reported in 4-6 months 9.00%    
Maximum      
Revenue Recognition, Milestone Method [Line Items]      
Premiums, percent reported within 3 months 89.00%    
Premiums, percent reported in 4-6 months 11.00%