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Coverage ratio.

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Debt instrument maturity period.

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Amount of Board authorized debt repurchase program.

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Fixed charge coverage ratio.

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Leverage ratio, which is net debt-to-EBITDA as defined in credit facility covenants.

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Amount of option to increase aggregate principal amount of line of credit.

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Minimum liquidity requirement under the credit facility.

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Maximum net proceeds retained from debt issuances and asset sales.

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Renewal period description.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure.

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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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Debt - Additional Information (Detail) - USD ($)				1 Months Ended	12 Months Ended
Debt - Additional Information (Detail) - USD ($)	Sep. 03, 2020	Jun. 26, 2020	Sep. 26, 2019	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Aug. 20, 2020	Aug. 01, 2019	Jul. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Repayment of debt					$ 450,000,000	$ 650,000,000
Prepayment premium					35,000,000	50,000,000
Aggregate borrowing capacity								$ 1,500,000,000
Additional borrowing capacity								$ 500,000,000
Credit facility				$ 2,471,000,000	2,471,000,000	989,000,000
Cash and cash equivalents				2,335,000,000	2,335,000,000	1,573,000,000				$ 1,542,000,000
Foreign Currency Borrowings
Debt Instrument [Line Items]
Aggregate borrowing capacity				500,000,000	500,000,000
Credit facility
Debt Instrument [Line Items]
Debt instrument increase in interest rate		0.40%
Consent fee		0.075%
Covenant relief period start date		Jul. 01, 2020
Credit facility \| Letter of Credit
Debt Instrument [Line Items]
Aggregate borrowing capacity				100,000,000	100,000,000
Credit facility \| Interest Rate Floor \| LIBOR
Debt Instrument [Line Items]
Interest rate floor		0.15%
Term Loan
Debt Instrument [Line Items]
Aggregate borrowing capacity				1,000,000,000	$ 1,000,000,000
Debt instrument increase in interest rate					0.40%
Credit facility				$ 997,000,000	$ 997,000,000	997,000,000
Debt interest rate				1.80%	1.80%
Term Loan \| LIBOR
Debt Instrument [Line Items]
Variable interest rate					1.65%
Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument increase in interest rate					0.40%
Credit facility maturity date					Jan. 11, 2024
Renewal period of credit facility					two six-month extension options
Facility commitment fee					0.25%
Debt interest rate				1.65%	1.65%
Net proceeds from (repayment of) credit facility					$ 1,483,000,000	$ (56,000,000)
Line of credit facility remaining borrowing capacity				$ 12,000,000	$ 12,000,000
Revolving Credit Facility \| LIBOR
Debt Instrument [Line Items]
Variable interest rate					1.50%
Line of credit interest terms					Outside of the Covenant Relief Period, we pay interest on revolver borrowings under the credit facility at floating rates equal to LIBOR plus a margin
Term Loan due January 2024
Debt Instrument [Line Items]
Credit facility maturity date					Jan. 11, 2024
Credit facility				500,000,000	$ 500,000,000
Renewal period of credit facility					one 1-year extension
Term Loan due January 2025
Debt Instrument [Line Items]
Credit facility maturity date					Jan. 09, 2025
Credit facility				500,000,000	$ 500,000,000
Upper Limit \| Swingline Loans
Debt Instrument [Line Items]
Aggregate borrowing capacity				100,000,000	$ 100,000,000
Upper Limit \| Term Loan \| LIBOR
Debt Instrument [Line Items]
Variable interest rate					1.65%
Upper Limit \| Revolving Credit Facility \| Investment grade
Debt Instrument [Line Items]
Facility commitment fee					0.30%
Upper Limit \| Revolving Credit Facility \| LIBOR \| Investment grade
Debt Instrument [Line Items]
Variable interest rate					1.45%
Lower Limit \| Term Loan \| LIBOR
Debt Instrument [Line Items]
Variable interest rate					0.85%
Lower Limit \| Revolving Credit Facility \| Investment grade
Debt Instrument [Line Items]
Facility commitment fee					0.125%
Lower Limit \| Revolving Credit Facility \| LIBOR \| Investment grade
Debt Instrument [Line Items]
Variable interest rate					0.775%
Series I senior notes 3.5% due September 2030
Debt Instrument [Line Items]
Face amount of debt	$ 150,000,000						$ 600,000,000
Debt interest rate							3.50%
Proceed from issuance of note	733,000,000
Debt instrument maturity period					2030-09
Frequency of interest payable					Interest is payable semi-annually
Date of first payment					Mar. 15, 2021
Series H senior notes 3.375% due December 2029
Debt Instrument [Line Items]
Face amount of debt			$ 650,000,000
Debt interest rate			3.375%
Proceed from issuance of note			$ 640,000,000
Debt instrument maturity period			2029-12
Frequency of interest payable						Interest is payable semi-annually
Date of first payment			Dec. 15, 2019
Series Z senior notes 6% due October 2021
Debt Instrument [Line Items]
Debt interest rate						6.00%
Repayment of debt						$ 300,000,000
Series C senior notes 4.75% due 2023
Debt Instrument [Line Items]
Face amount of debt	$ 450,000,000
Debt interest rate	4.75%
Repayment of debt	$ 364,000,000			86,000,000
Percentage of total debt repaid	81.00%
Repayment of debt	$ 390,000,000			94,000,000
Prepayment premium	$ 26,000,000			8,000,000
Series B senior notes 5.25% due March 2022
Debt Instrument [Line Items]
Debt interest rate						5.25%
Repayment of debt						$ 350,000,000
Covenant Relief Period \| Credit facility
Debt Instrument [Line Items]
Credit facility, minimum liquidity covenant				$ 400,000,000	$ 400,000,000
Net cash proceeds as a mandatory prepayment of amounts outstanding under the Credit Facility					$ 350,000,000
Covenant Requirement \| Credit facility
Debt Instrument [Line Items]
Debt covenant compliance					Under the terms of the Amendment, these covenant requirements currently are not in effect.
Debt instrument covenant description					Additionally, total debt used in the calculation of our leverage ratio is based on a “net debt” concept, under which cash and cash equivalents in excess of $100 million are deducted from our total debt balance.
Covenant Requirement \| Upper Limit \| Credit facility
Debt Instrument [Line Items]
Leverage ratio				7.25	7.25
Covenant Requirement \| Lower Limit \| Credit facility
Debt Instrument [Line Items]
Unsecured interest coverage ratio					1.75%
Fixed charge coverage ratio				1.25%	1.25%
Cash and cash equivalents				$ 100,000,000	$ 100,000,000
Debt Covenant \| Less Restrictive Covenant
Debt Instrument [Line Items]
Leverage ratio				6.0	6.0
Senior Notes
Debt Instrument [Line Items]
Face amount of debt				$ 3,100,000,000	$ 3,100,000,000	2,800,000,000
Unamortized discount				$ 35,000,000	$ 35,000,000	$ 24,000,000
Debt covenant compliance					As of December 31, 2020, we are below the EBITDA-to-interest coverage ratio covenant requirement of our senior notes indenture necessary to incur additional debt, and therefore, we will not be able to incur additional debt until we are in compliance.
Senior Notes \| Upper Limit
Debt Instrument [Line Items]
Debt repurchase authorized amount									$ 1,000,000,000.0