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Debt - Additional Information (Detail)	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2017 EUR (€)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 EUR (€)	Dec. 31, 2016 USD ($)	Jun. 30, 2015 EUR (€)
Senior Notes
Debt Instrument [Line Items]
Accrued interest related to senior notes			$ 75,000,000		$ 63,000,000
Credit Facility
Debt Instrument [Line Items]
Credit facility			1,500,000,000
Commitment fee on undrawn amounts		0.175%
Basis points added to LIBOR rate		1.375%
Letters of credit issued under the credit facility			14,000,000		$ 19,000,000
Uncommitted Credit Facility | International Subsidiary One
Debt Instrument [Line Items]
Credit facility | €		€ 50,000,000
Credit facility borrowings outstanding | €		€ 0
4.5% Senior Notes Due 2024
Debt Instrument [Line Items]
Senior unsecured notes principal amount			$ 500,000,000
Senior notes, interest rate	4.50%	4.50%	4.50%	4.50%	4.50%
Debt instrument redemption price percentage		100.00%
Senior notes issued price percentage		99.444%	99.444%
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%
2.5% Senior Notes Due 2022
Debt Instrument [Line Items]
Senior unsecured notes principal amount | €		€ 650,000,000		€ 650,000,000		€ 650,000,000
Senior notes, interest rate	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%
Debt instrument redemption price percentage		100.00%
Senior notes issued price percentage		99.525%	99.525%
2.5% 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%
7.456% Senior Notes Due 2018
Debt Instrument [Line Items]
Senior unsecured notes principal amount			$ 500,000,000
Senior notes, interest rate		7.456%	7.456%	7.456%	7.456%
Debt instrument redemption price percentage		100.00%
5.95% Senior Notes Due 2020
Debt Instrument [Line Items]
Senior unsecured notes principal amount			$ 750,000,000
Senior notes, interest rate	5.95%	5.95%	5.95%	5.95%	5.95%
Debt instrument redemption price percentage		100.00%
Senior notes issued price percentage		99.893%	99.893%
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%	101.00%
5.0% Senior Notes Due 2026
Debt Instrument [Line Items]
Senior unsecured notes principal amount			$ 750,000,000
Senior notes, interest rate	5.00%	5.00%	5.00%	5.00%	5.00%
Debt instrument redemption price percentage		100.00%
Senior notes issued price percentage		99.535%	99.535%
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
Senior notes, interest rate		3.80%	3.80%	3.80%	3.80%
Debt instrument redemption price percentage		100.00%
Senior notes issued price percentage		99.747%	99.747%
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%

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The senior notes were issued at a percentage of par (less than 100% of par results in a discount).

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

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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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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Amount of interest payable on debt, including, but not limited to, trade payables.

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

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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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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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