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Debt - Summary of Debt (Parenthetical) (Detail)	1 Months Ended	12 Months Ended
	Oct. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
2.15% Senior Notes Due 2018 [Member]
Debt Instrument [Line Items]
Interest rate		2.15%	2.15%
Maturity year		2018	2018
2.60% Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Interest rate		2.60%	2.60%
Maturity year		2019	2019
2.875% Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Interest rate	2.875%	2.875%	2.875%
Maturity year	2019	2019	2019
4.70% Senior Notes Due 2020 [Member]
Debt Instrument [Line Items]
Interest rate		4.70%	4.70%
Maturity year		2020	2020
3.15% Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Interest rate	3.15%	3.15%	3.15%
Maturity year	2021	2021	2021
3.75% Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Interest rate		3.75%	3.75%
Maturity year		2021	2021
4.00% Senior Notes Due 2022 [Member]
Debt Instrument [Line Items]
Interest rate		4.00%	4.00%
Maturity year		2022	2022
3.85% Senior Notes Due 2023 [Member]
Debt Instrument [Line Items]
Interest rate	3.85%	3.85%	3.85%
Maturity year	2023	2023	2023
5.00% Senior Notes Due 2023 [Member]
Debt Instrument [Line Items]
Interest rate		5.00%	5.00%
Maturity year		2023	2023
4.00% Senior Notes Due 2024 [Member]
Debt Instrument [Line Items]
Interest rate		4.00%	4.00%
Maturity year		2024	2024
3.90% Senior Notes Due 2025 [Member]
Debt Instrument [Line Items]
Interest rate		3.90%	3.90%
Maturity year		2025	2025
4.20% Senior Notes Due 2026 [Member]
Debt Instrument [Line Items]
Interest rate	4.20%	4.20%	4.20%
Maturity year	2026	2026	2026
5.375% Senior Notes Due 2036 [Member]
Debt Instrument [Line Items]
Interest rate		5.375%	5.375%
Maturity year		2036	2036
5.50% Senior Notes Due 2046 [Member]
Debt Instrument [Line Items]
Interest rate		5.50%	5.50%
Maturity year		2046	2046

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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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