Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details)

v3.8.0.1
Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating loss carryforwards      
Net operating loss carryforwards $ 99 $ 93  
Unrecognized tax benefits      
Balance at beginning of year 105 89 $ 67
Additions based on tax positions related to the current year 17 16 15
Additions for tax positions of prior years 1 1 7
Reductions for lapse of statute of limitations   (1)  
Balance at end of year 123 105 89
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 78 63 $ 53
Accrued interest and penalties related to uncertain tax positions 13 $ 9  
Minimum      
Unrecognized tax benefits      
Income Tax Examination, Estimate of Possible Loss 10    
Maximum      
Unrecognized tax benefits      
Income Tax Examination, Estimate of Possible Loss 14    
State      
Operating loss carryforwards      
Operating loss carryforwards not expected to be utilized 8    
Foreign      
Operating loss carryforwards      
Operating loss carryforwards not expected to be utilized 56    
Trip Advisor      
Operating loss carryforwards      
Net operating loss carryforwards $ 56