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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Consolidated leverage ratio.

+ References

No definition available.

+ Details

Name:	uhs_ConsolidatedLeverageRatio
Namespace Prefix:	uhs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt instrument principal amount issuance percentage.

+ References

No definition available.

+ Details

Name:	uhs_DebtInstrumentPrincipalAmountIssuancePercentage
Namespace Prefix:	uhs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt instrument yield percentage.

+ References

No definition available.

+ Details

Name:	uhs_DebtInstrumentYieldPercentage
Namespace Prefix:	uhs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Interest rate margin adjustment percentage.

+ References

No definition available.

+ Details

Name:	uhs_InterestRateMarginAdjustmentPercentage
Namespace Prefix:	uhs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line of credit facility maturity month and year.

+ References

No definition available.

+ Details

Name:	uhs_LineOfCreditFacilityMaturityMonthAndYear
Namespace Prefix:	uhs_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of additional forward starting interest rate swaps.

+ References

No definition available.

+ Details

Name:	uhs_NumberOfAdditionalForwardStartingInterestRateSwaps
Namespace Prefix:	uhs_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of previously outstanding interest rate swaps.

+ References

No definition available.

+ Details

Name:	uhs_NumberOfPreviouslyOutstandingInterestRateSwaps
Namespace Prefix:	uhs_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Rate adjustment to federal funds rate weighted average.

+ References

No definition available.

+ Details

Name:	uhs_RateAdjustmentToFederalFundsRateWeightedAverage
Namespace Prefix:	uhs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Rate adjustment to one month Eurodollar rate on credit facility borrowings.

+ References

No definition available.

+ Details

Name:	uhs_RateAdjustmentToOneMonthEurodollarRateOnCreditFacilityBorrowings
Namespace Prefix:	uhs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Securitized borrowings credit facility borrowing capacity.

+ References

No definition available.

+ Details

Name:	uhs_SecuritizedBorrowingsCreditFacilityBorrowingCapacity
Namespace Prefix:	uhs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the required periodic payments applied to principal.

+ References

+ Details

Name:	us-gaap_DebtInstrumentPeriodicPaymentPrincipal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

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

+ References

+ Details

Name:	us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeAverageFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeMaturityDates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The increase (decrease) during the reporting period of all assets and liabilities used in operating activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

+ Details

Name:	us-gaap_IncreaseDecreaseInOperatingCapital
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959

+ Details

Name:	us-gaap_InterestRateCashFlowHedgeAssetAtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

+ Details

Name:	us-gaap_InterestRateCashFlowHedgeDerivativeAtFairValueNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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

+ References

+ Details

Name:	us-gaap_InterestRateCashFlowHedgeLiabilityAtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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.

+ References

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of increase (decrease) of the credit facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Date the credit facility first became available, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityInitiationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

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.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermDebtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

This is the principal amount outstanding for securitized loans only (across all types of loans).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=64830801&loc=d3e107314-111719

+ Details

Name:	us-gaap_PrincipalAmountOutstandingOnLoansSecuritized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

Name:	us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=uhs_PreviouslyOutstandingInterestRateSwapsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=uhs_OnePointThreeOnePercentForwardStartingInterestRateSwapsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=uhs_OnePointFourZeroPercentForwardStartingInterestRateSwapsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=uhs_OnePointTwoThreePercentForwardStartingInterestRateSwapsOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=uhs_OnePointTwoOnePercentForwardStartingInterestRateSwapsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeForwardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_CashFlowHedgingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=uhs_ForwardStartingInterestRateSwapsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=uhs_OnePointTwoThreePercentForwardStartingInterestRateSwapsTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=uhs_OnePointTwoThreePercentForwardStartingInterestRateSwapsThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=uhs_AccountsReceivableSecuritizationFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=uhs_SeniorNotesSevenPointOneTwoFivePercentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=uhs_ShortTermOnDemandCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=uhs_ABRBasedLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=uhs_OneMonthEurodollarRatePlusIndexBasedLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=uhs_OneTwoThreeSixMonthEurodollarRatePlusIndexBasedLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=uhs_TermLoanFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=uhs_GroupThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=uhs_GroupFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=uhs_NewSeniorSecuredCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=uhs_ThreePointSevenFivePercentSeniorSecuredNotesDueTwoThousandNineteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=uhs_FourPointSevenFivePercentSeniorSecuredNotesDueTwoThousandTwentyTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=uhs_FivePointZeroZeroPercentSeniorSecuredNotesDueTwoThousandTwentySixMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Long-term debt, Cash Flow Hedges and Foreign Currency Forward Exchange Contracts - Additional Information (Detail)			3 Months Ended						6 Months Ended	12 Months Ended
	Jun. 07, 2016 USD ($)	May 31, 2015 USD ($) Derivative	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) Derivative	Sep. 30, 2015 USD ($) Derivative	Jun. 30, 2015 USD ($) Derivative	Dec. 31, 2014 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($) Derivative	Dec. 31, 2016 USD ($)	Jun. 03, 2016 USD ($)	Aug. 07, 2014 USD ($)
Debt Instrument [Line Items]
Line of credit facility, starting date	Jun. 07, 2016
Line of credit facility, maturity month	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			400,000,000
Reduction of long-term debt			260,633,000	$ 166,671,000
Debt instrument carrying amount			3,900,000,000								$ 4,100,000,000
Fair value of debt			3,900,000,000								4,100,000,000
Number of additional forward starting interest rate swaps \| Derivative						4
Previously Outstanding Interest Rate Swaps
Debt Instrument [Line Items]
Maturity date of interest rate cash flow hedges		May 31, 2015
One Point Three One Percent Forward Starting Interest Rate Swaps
Debt Instrument [Line Items]
Maturity date of interest rate cash flow hedges										Apr. 15, 2019
Number of additional forward starting interest rate swaps \| Derivative										9
Fixed rate payable on interest rate swap		1.31%
One Point Four Zero Percent Forward Starting Interest Rate Swaps
Debt Instrument [Line Items]
Maturity date of interest rate cash flow hedges							Apr. 15, 2019
Number of additional forward starting interest rate swaps \| Derivative							4
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]
Maturity date of interest rate cash flow hedges					Apr. 15, 2019
Number of additional forward starting interest rate swaps \| Derivative					1
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			3,000,000
Fair value of our interest rate swaps, assets			4,000,000								4,000,000
Fair value of our interest rate swaps, liability			1,000,000								$ 4,000,000
Foreign Currency Forward Exchange Contracts
Debt Instrument [Line Items]
Net cash (outflows) inflows			$ (8,000,000)	$ 21,000,000
Cash Flow Hedging \| Previously Outstanding Interest Rate Swaps
Debt Instrument [Line Items]
Number of previously outstanding interest rate swaps \| Derivative		7
Notional amount of interest rate cash flow hedges		$ 825,000,000
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			$ 0
Senior Notes 7.125%
Debt Instrument [Line Items]
Senior notes, interest rate									7.125%
Senior notes, maturity date									Jun. 30, 2016
Reduction of long-term debt									$ 400,000,000
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			$ 217,000,000
Current applicable margins			1.50%
Line of credit facility, available borrowing capacity			$ 515,000,000
Letters of credit, outstanding			33,000,000
Revolving Credit Facility \| Short Term on Demand Credit Facility
Debt Instrument [Line Items]
Line of credit facility amount outstanding			35,000,000
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 amount outstanding			$ 1,842,000,000
Line of credit facility increased amount	$ 200,000,000
Current applicable margins			1.50%
Term Loan A \| Quarterly installment payments made from the fourth quarter of 2014 through third quarter of 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
Debt Instrument [Line Items]
Senior notes, issued			$ 1,400,000,000
New Senior Secured Notes \| 3.75% 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
New Senior Secured Notes \| 4.75% Senior Secured Notes due 2022
Debt Instrument [Line Items]
Senior notes, issued			$ 700,000,000									$ 400,000,000	$ 300,000,000
Senior notes, interest rate			4.75%
Senior notes issued percentage												101.50%
Senior notes yield percentage												4.35%
Senior notes, maturity date			Aug. 01, 2022
New Senior Secured Notes \| 5.00% Senior Secured Notes due 2026
Debt Instrument [Line Items]
Senior notes, issued												$ 400,000,000
Senior notes, interest rate												5.00%
Senior notes, maturity date			Jun. 01, 2026