Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Interest rate margin adjustment percentage.

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Line of credit facility, additional borrowing capacity.

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Rate adjustment to federal funds rate weighted average.

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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Date the debt agreement requires the first payment to be made, in CCYY-MM-DD format.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of the required periodic payments applied to principal.

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Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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Average fixed interest rate related to the group of interest rate derivatives.

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Fixed interest rate related to the interest rate derivative.

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Date the derivative contract matures, in CCYY-MM-DD format.

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Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Disclosure of timing of required repayments, sinking fund requirements, and other redeemable securities at fixed or determinable prices and dates in the five years immediately following the date of the latest balance sheet presented in the financial statements, and the amount thereafter to fully repay the principal of long-term debt. These disclosures may be made either on an individual debt or security basis, by type of debt or security basis, or on a combined basis.

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Long-term debt and cash flow hedges - Additional Information (Detail)		3 Months Ended						12 Months Ended
	Aug. 07, 2014 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) Derivative	Sep. 30, 2015 USD ($) Derivative	Jun. 30, 2015 USD ($) Derivative	Dec. 31, 2014 USD ($)	Mar. 31, 2011 USD ($) Derivative	Dec. 31, 2015 USD ($) Derivative	Jun. 30, 2008 USD ($)	Jun. 30, 2006 USD ($)
Debt Instrument [Line Items]
Line of credit facility, starting date	Aug. 07, 2014	Aug. 07, 2014
Line of credit facility, maturity month	2019-08	2019-08
Rate adjustment to weighted average federal funds rate for credit facility borrowings		0.50%
Rate adjustment to one month Eurodollar rate on credit facility borrowings		1.00%
Accounts receivable securitization program credit facility, borrowing capacity		$ 400,000,000
Accounts receivable securitization program credit facility, amount outstanding		350,000,000
Debt instrument carrying amount		3,300,000,000	$ 3,500,000,000					$ 3,500,000,000
Fair value of debt		3,300,000,000	$ 3,500,000,000					$ 3,500,000,000
Number of additional forward starting interest rate swaps \| Derivative				4
Maturity date of interest rate cash flow hedges							May 31, 2015
Two Point Three Eight Percent Forward Starting Interest Rate Swaps
Debt Instrument [Line Items]
Number of additional forward starting interest rate swaps \| Derivative							4
Fixed rate payable on interest rate swap							2.38%
One Point Nine One Percent Forward Starting Interest Rate Swaps
Debt Instrument [Line Items]
Number of additional forward starting interest rate swaps \| Derivative							3
Fixed rate payable on interest rate swap							1.91%
One Point Three One Percent Forward Starting Interest Rate Swaps
Debt Instrument [Line Items]
Number of additional forward starting interest rate swaps \| Derivative								9
Maturity date of interest rate cash flow hedges								Apr. 15, 2019
Fixed rate payable on interest rate swap			1.31%					1.31%
One Point Four Zero Percent Forward Starting Interest Rate Swaps
Debt Instrument [Line Items]
Number of additional forward starting interest rate swaps \| Derivative					4
Maturity date of interest rate cash flow hedges					Apr. 15, 2019
Average fixed rate payable on interest rate swap					1.40%
One Point Two Three Percent Forward Starting Interest Rate Swaps One
Debt Instrument [Line Items]
Maturity date of interest rate cash flow hedges				Apr. 15, 2019
Average fixed rate payable on interest rate swap				1.23%
One Point Two One Percent Forward Starting Interest Rate Swaps
Debt Instrument [Line Items]
Number of additional forward starting interest rate swaps \| Derivative			1
Maturity date of interest rate cash flow hedges			Apr. 15, 2019
Fixed rate payable on interest rate swap			1.21%					1.21%
Interest Rate Swap
Debt Instrument [Line Items]
Fair value of our interest rate swaps		16,000,000	$ 1,000,000					$ 1,000,000
Fair value of our interest rate swaps, liability		7,000,000	6,000,000					6,000,000
Fair value of our interest rate swaps, assets			5,000,000					5,000,000
Interest Rate Swap \| Other Noncurrent Liabilities
Debt Instrument [Line Items]
Fair value of our interest rate swaps, liability		$ 9,000,000
Cash Flow Hedging
Debt Instrument [Line Items]
Number of additional forward starting interest rate swaps \| Derivative							7
Notional amount of interest rate cash flow hedges							$ 825,000,000
Cash Flow Hedging \| Two Point Three Eight Percent Forward Starting Interest Rate Swaps
Debt Instrument [Line Items]
Notional amount of interest rate cash flow hedges							600,000,000
Cash Flow Hedging \| One Point Nine One Percent Forward Starting Interest Rate Swaps
Debt Instrument [Line Items]
Notional amount of interest rate cash flow hedges							$ 225,000,000
Cash Flow Hedging \| One Point Three One Percent Forward Starting Interest Rate Swaps
Debt Instrument [Line Items]
Notional amount of interest rate cash flow hedges			1,000,000,000					1,000,000,000
Cash Flow Hedging \| One Point Four Zero Percent Forward Starting Interest Rate Swaps
Debt Instrument [Line Items]
Notional amount of interest rate cash flow hedges					$ 500,000,000
Cash Flow Hedging \| Forward Starting Interest Rate Swaps
Debt Instrument [Line Items]
Notional amount of interest rate cash flow hedges				$ 400,000,000
Cash Flow Hedging \| One Point Two Three Percent Forward Starting Interest Rate Swaps One
Debt Instrument [Line Items]
Notional amount of interest rate cash flow hedges				100,000,000
Cash Flow Hedging \| One Point Two Three Percent Forward Starting Interest Rate Swaps Two
Debt Instrument [Line Items]
Notional amount of interest rate cash flow hedges				200,000,000
Cash Flow Hedging \| One Point Two Three Percent Forward Starting Interest Rate Swaps Three
Debt Instrument [Line Items]
Notional amount of interest rate cash flow hedges				$ 100,000,000
Cash Flow Hedging \| One Point Two One Percent Forward Starting Interest Rate Swaps
Debt Instrument [Line Items]
Notional amount of interest rate cash flow hedges			$ 100,000,000					$ 100,000,000
Accounts Receivable Securitization Facility
Debt Instrument [Line Items]
Line of credit facility, maturity month		2018-12
Accounts receivable securitization program, additional capacity		$ 50,000,000
Senior Notes 7.125%
Debt Instrument [Line Items]
Senior notes, issued										$ 250,000,000
Senior notes, interest rate										7.125%
Senior notes, maturity date		Jun. 30, 2016
Senior notes, repayment terms		Interest on the 7.125% Notes is payable semiannually in arrears on June 30th and December 30th of each year.
Line of credit facility additional borrowing capacity									$ 150,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, borrowing capacity	$ 800,000,000	$ 800,000,000
Line of credit facility amount outstanding		$ 195,000,000
Current applicable margins		1.50%
Line of credit facility, available borrowing capacity		$ 552,000,000
Letters of credit, outstanding		34,000,000
Revolving Credit Facility \| Short Term on Demand Credit Facility
Debt Instrument [Line Items]
Line of credit facility amount outstanding		19,000,000
Revolving Credit Facility \| Letter of Credit
Debt Instrument [Line Items]
Line of credit facility, borrowing capacity		$ 125,000,000
Revolving Credit Facility \| ABR-based loans
Debt Instrument [Line Items]
Current applicable margins		0.50%
Revolving Credit Facility \| Minimum \| One Month Eurodollar Rate Plus Index Based Loans
Debt Instrument [Line Items]
Consolidated Leverage Ratio		0.50%
Revolving Credit Facility \| Minimum \| One Two Three Six Month Eurodollar Rate Plus Index Based Loans
Debt Instrument [Line Items]
Consolidated Leverage Ratio		1.50%
Revolving Credit Facility \| Maximum \| One Month Eurodollar Rate Plus Index Based Loans
Debt Instrument [Line Items]
Consolidated Leverage Ratio		1.25%
Revolving Credit Facility \| Maximum \| One Two Three Six Month Eurodollar Rate Plus Index Based Loans
Debt Instrument [Line Items]
Consolidated Leverage Ratio		2.25%
Term Loan A
Debt Instrument [Line Items]
Line of credit facility, borrowing capacity	1,775,000,000
Line of credit facility amount outstanding		$ 1,708,000,000
Current applicable margins		1.50%
Term Loan A \| Quarterly installment payments commence in the fourth quarter of 2014 through September, 2016
Debt Instrument [Line Items]
Scheduled principal payments made						$ 11,000,000
Term Loan A \| Quarterly installment payments after September, 2016
Debt Instrument [Line Items]
Scheduled principal payments made						$ 22,000,000
Term Loan A \| ABR-based loans
Debt Instrument [Line Items]
Current applicable margins		0.50%
Term Loan A \| Minimum \| One Month Eurodollar Rate Plus Index Based Loans
Debt Instrument [Line Items]
Consolidated Leverage Ratio		0.50%
Term Loan A \| Minimum \| One Two Three Six Month Eurodollar Rate Plus Index Based Loans
Debt Instrument [Line Items]
Consolidated Leverage Ratio		1.50%
Term Loan A \| Maximum \| One Month Eurodollar Rate Plus Index Based Loans
Debt Instrument [Line Items]
Consolidated Leverage Ratio		1.25%
Term Loan A \| Maximum \| One Two Three Six Month Eurodollar Rate Plus Index Based Loans
Debt Instrument [Line Items]
Consolidated Leverage Ratio		2.25%
New Senior Secured Notes \| 3.750% Senior Secured Notes due 2019
Debt Instrument [Line Items]
Senior notes, issued	$ 300,000,000
Senior notes, interest rate	3.75%
Senior notes, maturity date		Aug. 01, 2019
Senior notes, interest payment, commencement date		Feb. 01, 2015
New Senior Secured Notes \| 4.750% Senior Secured Notes due 2022
Debt Instrument [Line Items]
Senior notes, issued	$ 300,000,000
Senior notes, interest rate	4.75%
Senior notes, maturity date		Aug. 01, 2022