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Debt - Summary of Debt (Non-Printing) (Detail)	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
2.60% senior notes due 2019
Debt Instrument [Line Items]
Interest rate	2.60%	2.60%
Maturity year	2019	2019
3.15% senior notes due 2021
Debt Instrument [Line Items]
Interest rate	3.15%	3.15%
Maturity year	2021	2021
3.75% senior notes due 2021
Debt Instrument [Line Items]
Interest rate	3.75%	3.75%
Maturity year	2021	2021
3.85% senior notes due 2023
Debt Instrument [Line Items]
Interest rate	3.85%	3.85%
Maturity year	2023	2023
3.90% senior notes due 2025
Debt Instrument [Line Items]
Interest rate	3.90%	3.90%
Maturity year	2025	2025
4.00% senior notes due 2024
Debt Instrument [Line Items]
Interest rate	4.00%	4.00%
Maturity year	2024	2024
4.20% senior notes due 2026
Debt Instrument [Line Items]
Interest rate	4.20%	4.20%
Maturity year	2026	2026
4.00% senior notes due 2022
Debt Instrument [Line Items]
Interest rate	4.00%	4.00%
Maturity year	2022	2022
4.70% senior notes due 2020
Debt Instrument [Line Items]
Interest rate	4.70%	4.70%
Maturity year	2020	2020
5.375% senior notes due 2036
Debt Instrument [Line Items]
Interest rate	5.375%	5.375%
Maturity year	2036	2036
5.50% senior notes due 2046
Debt Instrument [Line Items]
Interest rate	5.50%	5.50%
Maturity year	2046	2046
5.00% senior notes due 2023
Debt Instrument [Line Items]
Interest rate	5.00%	5.00%
Maturity year	2023	2023

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Debt instruments maturity year.

+ References

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- 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.

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