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

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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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Debt - Additional Information (Detail)	3 Months Ended
Debt - Additional Information (Detail)	Mar. 31, 2020 EUR (€)	May 05, 2020 USD ($)	Mar. 31, 2020 USD ($)	Mar. 18, 2020 USD ($)	Dec. 31, 2019 USD ($)
Revolving Credit Facility
Debt Instrument [Line Items]
Debt, interest rate (percentage)	2.01%		2.01%
Credit facility			$ 2,000,000,000
Credit facility borrowings outstanding			1,900,000,000	$ 1,900,000,000	$ 0
Commitment fee on undrawn amounts	0.15%
Letters of credit issued under the credit facility			16,000,000		16,000,000
Uncommitted Credit Facility \| International Subsidiary One
Debt Instrument [Line Items]
Credit facility \| €	€ 50,000,000
Credit facility borrowings outstanding	€ 0				0
Senior Notes
Debt Instrument [Line Items]
Accrued interest related to senior notes			38,000,000		$ 76,000,000
Unsecured Senior Notes \| Subsequent Event
Debt Instrument [Line Items]
Senior unsecured notes principal amount		$ 2,750,000,000
5.95% senior notes due 2020
Debt Instrument [Line Items]
Senior unsecured notes principal amount			$ 750,000,000
Debt, interest rate (percentage)	5.95%		5.95%
Senior notes issued price percentage	99.893%		99.893%
Debt instrument redemption price percentage	100.00%
5.95% senior notes due 2020 \| Upon the occurrence of certain change of control triggering events
Debt Instrument [Line Items]
Debt instrument redemption price percentage	101.00%
2.5% (€650 million) senior notes due 2022
Debt Instrument [Line Items]
Senior unsecured notes principal amount \| €	€ 650,000,000
Debt, interest rate (percentage)	2.50%		2.50%
Senior notes issued price percentage	99.525%		99.525%
Debt instrument redemption price percentage	100.00%
2.5% (€650 million) senior notes due 2022 \| Upon the occurrence of certain change of control triggering events
Debt Instrument [Line Items]
Debt instrument redemption price percentage	101.00%
4.5% senior notes due 2024
Debt Instrument [Line Items]
Senior unsecured notes principal amount			$ 500,000,000
Debt, interest rate (percentage)	4.50%		4.50%
Senior notes issued price percentage	99.444%		99.444%
Debt instrument redemption price percentage	100.00%
4.5% senior notes due 2024 \| Upon the occurrence of certain change of control triggering events
Debt Instrument [Line Items]
Debt instrument redemption price percentage	101.00%
5.0% senior notes due 2026
Debt Instrument [Line Items]
Senior unsecured notes principal amount			$ 750,000,000
Debt, interest rate (percentage)	5.00%		5.00%
Senior notes issued price percentage	99.535%		99.535%
Debt instrument redemption price percentage	100.00%
5.0% senior notes due 2026 \| Upon the occurrence of certain change of control triggering events
Debt Instrument [Line Items]
Debt instrument redemption price percentage	101.00%
3.8% senior notes due 2028
Debt Instrument [Line Items]
Senior unsecured notes principal amount			$ 1,000,000,000
Debt, interest rate (percentage)	3.80%		3.80%
Senior notes issued price percentage	99.747%		99.747%
Debt instrument redemption price percentage	100.00%
3.8% senior notes due 2028 \| Upon the occurrence of certain change of control triggering events
Debt Instrument [Line Items]
Debt instrument redemption price percentage	101.00%
3.25% senior notes due 2030
Debt Instrument [Line Items]
Senior unsecured notes principal amount			$ 1,250,000,000
Debt, interest rate (percentage)	3.25%		3.25%
Senior notes issued price percentage	99.225%		99.225%
3.25% senior notes due 2030 \| Notes prior to November 15, 2029
Debt Instrument [Line Items]
Debt instrument redemption price percentage	100.00%
3.25% senior notes due 2030 \| Notes on or after November 15, 2029
Debt Instrument [Line Items]
Debt instrument redemption price percentage	100.00%
3.25% senior notes due 2030 \| Upon the occurrence of certain change of control triggering events
Debt Instrument [Line Items]
Debt instrument redemption price percentage	101.00%
LIBOR \| Revolving Credit Facility
Debt Instrument [Line Items]
Basis points added to LIBOR rate	1.125%