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Debt - Summary of Debt (Parenthetical) (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
2.60% Senior Notes Due 2019 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 2.60% | 2.60%
Maturity year | 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%
Maturity year | 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%
Maturity year | 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%
Maturity year | 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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- 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 + Details
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