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Commitments and Contingencies - Commercial Commitments Outstanding (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]  
Total standby letters of credit $ 83us-gaap_LettersOfCreditOutstandingAmount
Standby letters of credit due to expire in less than 1 year 79hot_StandbyLetterOfCreditDueToExpireInLessThanOneYear
Standby letters of credit due to expire in 1-3 years 0hot_StandbyLetterOfCreditDueToExpireInOneToThreeYears
Standby letters of credit due to expire in 3-5 years 0hot_StandbyLetterOfCreditDueToExpireInThreeToFiveYears
Standby letters of credit due to expire after 5 years $ 4hot_StandbyLetterOfCreditDueToExpireAfterFiveYears