Financial Instruments	6 Months Ended
Jun. 30, 2017
Financial Instruments [Abstract]
Financial Instruments	Financial Instruments The Company’s indebtedness creates interest rate risk on its variable-rate debt. The Company uses derivative financial instruments to manage its exposure to interest rate risk. The Company does not hold or issue derivative financial instruments for trading or speculative purposes. The fair value of the Company’s interest rate cap agreements is classified as Level 2 in the fair value hierarchy. The valuation of the interest rate cap agreements is derived by using a discounted cash flow analysis on the expected cash receipts that would occur if variable interest rates rise above the strike rates of the caps. This analysis reflects the contractual terms of the interest rate cap agreements, including the period to maturity, and uses observable market-based inputs, including LIBOR curves and implied volatilities. The Company also incorporates insignificant credit valuation adjustments to appropriately reflect the respective counterparty’s nonperformance risk in the fair value measurements. The counterparty credit spreads are based on publicly available credit information obtained from a third party credit data provider. The Company entered into interest rate cap agreements. These agreements entitle the Company to payments from the counterparty of the amount, if any, by which three-month LIBOR exceeds 1.5% during the agreement period. The interest rate cap agreements are in effect from January 17, 2017 through December 31, 2018 with a combined notional amount of $1,400 million. As of June 30, 2017 and December 31, 2016, interest rate cap agreements had a fair value of $3 million and $5 million, respectively, and are classified within Other Assets on the Consolidated Balance Sheets. During the first quarter of 2017, the Company designated the interest rate cap agreements as cash flow hedges. The effective portion of changes in the fair value of derivatives that qualify as cash flow hedges is recorded in AOCL and is subsequently reclassified into Interest expense in the period when the hedged forecasted transaction affects earnings. If a derivative is deemed to be ineffective, the ineffective portion of the change in fair value of the derivative is recognized directly in earnings. During the six months ended June 30, 2017, the Company’s interest rate cap agreements were deemed effective and the Company expects they will be effective for the next twelve months. The Company recorded a $1 million loss, net of tax benefit of $1 million, for the effective portion of the interest rate cap agreements in AOCL for the three months ended June 30, 2017. The Company recorded a $2 million loss, net of a tax benefit of $1 million, for the effective portion of the interest rate cap agreements in AOCL for the six months ended June 30, 2017. The Company expects to reclassify $1 million from AOCL into Interest expense during the next twelve months. Prior to the election of hedge accounting treatment, the Company recognized less than $1 million of Interest income in the Company's Consolidated Statement of Operations for both the three and six months ended June 30, 2017 and less than $1 million of Interest expense for both the three and six months ended June 30, 2016 related to the changes in the fair value of the interest rate cap agreements. For additional details, see Note 6 (Long-Term Debt).

Financial Instruments

The Company’s indebtedness creates interest rate risk on its variable-rate debt. The Company uses derivative financial instruments to manage its exposure to interest rate risk. The Company does not hold or issue derivative financial instruments for trading or speculative purposes.

The fair value of the Company’s interest rate cap agreements is classified as Level 2 in the fair value hierarchy. The valuation of the interest rate cap agreements is derived by using a discounted cash flow analysis on the expected cash receipts that would occur if variable interest rates rise above the strike rates of the caps. This analysis reflects the contractual terms of the interest rate cap agreements, including the period to maturity, and uses observable market-based inputs, including LIBOR curves and implied volatilities. The Company also incorporates insignificant credit valuation adjustments to appropriately reflect the respective counterparty’s nonperformance risk in the fair value measurements. The counterparty credit spreads are based on publicly available credit information obtained from a third party credit data provider.

The Company entered into interest rate cap agreements. These agreements entitle the Company to payments from the counterparty of the amount, if any, by which three-month LIBOR exceeds 1.5% during the agreement period. The interest rate cap agreements are in effect from January 17, 2017 through December 31, 2018 with a combined notional amount of $1,400 million. As of June 30, 2017 and December 31, 2016, interest rate cap agreements had a fair value of $3 million and $5 million, respectively, and are classified within Other Assets on the Consolidated Balance Sheets.

During the first quarter of 2017, the Company designated the interest rate cap agreements as cash flow hedges. The effective portion of changes in the fair value of derivatives that qualify as cash flow hedges is recorded in AOCL and is subsequently reclassified into Interest expense in the period when the hedged forecasted transaction affects earnings. If a derivative is deemed to be ineffective, the ineffective portion of the change in fair value of the derivative is recognized directly in earnings. During the six months ended June 30, 2017, the Company’s interest rate cap agreements were deemed effective and the Company expects they will be effective for the next twelve months. The Company recorded a $1 million loss, net of tax benefit of $1 million, for the effective portion of the interest rate cap agreements in AOCL for the three months ended June 30, 2017. The Company recorded a $2 million loss, net of a tax benefit of $1 million, for the effective portion of the interest rate cap agreements in AOCL for the six months ended June 30, 2017. The Company expects to reclassify $1 million from AOCL into Interest expense during the next twelve months.

Prior to the election of hedge accounting treatment, the Company recognized less than $1 million of Interest income in the Company's Consolidated Statement of Operations for both the three and six months ended June 30, 2017 and less than $1 million of Interest expense for both the three and six months ended June 30, 2016 related to the changes in the fair value of the interest rate cap agreements.

For additional details, see Note 6 (Long-Term Debt).