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Long-term Debt - Additional Information (Detail) $ in Thousands, € in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 29, 2020 USD ($) | Apr. 24, 2019 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 EUR (€) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2020 EUR (€) | Dec. 31, 2019 EUR (€) | Sep. 30, 2019 EUR (€)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt, fair value |  |  | $ 17,200,000 |  |  | $ 17,200,000 |  | $ 15,300,000 |  |  |
Committed credit facility agreement aggregated |  |  | 8,060,000 |  |  | 8,060,000 |  |  |  |  |
Unused credit facility |  |  | 6,980,000 |  |  | 6,980,000 |  |  |  |  |
Debt instrument premium paid on repurchase |  |  |  | $ 40,000 |  | 29,000 |  |  |  |  |
Long-term debt, carrying amount |  |  | 16,471,000 |  |  | 16,471,000 |  | $ 14,770,000 |  |  |
Debt instrument premium paid |  | $ 48,000 |  |  |  |  |  |  |  |  |
0.25% Notes due 2027 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notes, face amount |  |  | $ 500,000 |  | € 400 | $ 500,000 |  |  | € 1,000 | € 500 | € 500
Debt instrument interest rate |  |  | 0.25% |  | 0.25% | 0.25% | 0.25% | 0.25% |  | 0.25% | 0.25%
Debt instrument maturity date |  |  |  |  | 2027 | 2027 | 2027 | 2027 |  |  |
Long-term debt, carrying amount |  |  | $ 1,058,000 |  |  | $ 1,058,000 |  | $ 550,000 |  |  |
0.50% Notes due 2031 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notes, face amount |  |  |  |  | € 400 |  | $ 500,000 |  |  | € 500 |
Debt instrument interest rate |  |  | 0.50% |  | 0.50% | 0.50% | 0.50% | 0.50% |  | 0.50% | 0.50%
Debt instrument maturity date |  |  |  |  | 2031 | 2031 | 2031 | 2031 |  |  |
Long-term debt, carrying amount |  |  | $ 1,058,000 |  |  | $ 1,058,000 |  | $ 544,000 |  |  |
1.375% Notes due 2026 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notes, face amount | € |  |  |  |  |  |  |  |  | € 1,000 |  |
Debt instrument interest rate |  |  | 1.375% | 1.375% |  | 1.375% |  | 1.375% | 1.375% | 1.375% |
Debt instrument maturity date |  |  |  | 2026 |  | 2026 |  | 2026 |  |  |
Long-term debt, carrying amount |  |  | $ 1,163,000 |  |  | $ 1,163,000 |  |  |  |  |
2.65% Senior Notes due 2030 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notes, face amount |  |  |  | $ 900,000 |  |  |  |  |  |  |
Debt instrument interest rate |  |  | 2.65% | 2.65% |  | 2.65% |  | 2.65% | 2.65% | 2.65% |
Debt instrument maturity date |  |  |  | 2030 |  | 2030 |  | 2030 |  |  |
Long-term debt, carrying amount |  |  | $ 1,250,000 |  |  | $ 1,250,000 |  |  |  |  |
2.0% Notes due 2032 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notes, face amount | € |  |  |  |  |  |  |  |  | € 1,000 |  |
Debt instrument interest rate |  |  | 2.00% | 2.00% |  | 2.00% |  | 2.00% | 2.00% | 2.00% |
Debt instrument maturity date |  |  |  | 2032 |  | 2032 |  | 2032 |  |  |
Long-term debt, carrying amount |  |  | $ 1,163,000 |  |  | $ 1,163,000 |  |  |  |  |
4.20% Senior Notes due 2021 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate |  |  | 4.20% | 4.20% |  | 4.20% |  | 4.20% | 4.20% | 4.20% |
Debt instrument maturity date |  |  |  | 2021 |  | 2021 |  | 2021 |  |  |
Debt instrument, repurchase amount |  |  |  | $ 600,000 |  |  |  |  |  |  |
Long-term debt, carrying amount |  |  |  |  |  |  |  | $ 600,000 |  |  |
3.30% Senior Notes due 2021 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate |  |  | 3.30% | 3.30% |  | 3.30% |  | 3.30% | 3.30% | 3.30% |
Debt instrument maturity date |  |  |  | 2021 |  | 2021 |  | 2021 |  |  |
Debt instrument, repurchase amount |  |  |  | $ 935,000 |  |  |  |  |  |  |
Long-term debt, carrying amount |  |  |  |  |  |  |  | $ 1,597,000 |  |  |
2.65% Senior Notes due 2030 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notes, face amount |  |  | $ 350,000 |  |  | $ 350,000 |  |  |  |  |
Debt instrument interest rate |  |  | 2.65% |  |  | 2.65% |  |  |  |  |
Debt instrument maturity date |  |  | 2030 |  |  |  |  |  |  |  |
1.40% Senior Notes due 2025 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notes, face amount |  |  | $ 500,000 |  |  | $ 500,000 |  |  |  |  |
Debt instrument interest rate |  |  | 1.40% |  |  | 1.40% |  | 1.40% |  | 1.40% |
Debt instrument maturity date |  |  | 2025 |  |  | 2025 |  | 2025 |  |  |
Long-term debt, carrying amount |  |  | $ 498,000 |  |  | $ 498,000 |  |  |  |  |
0.00% Notes due 2024 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notes, face amount | € |  |  |  |  |  |  |  |  |  | € 500 | € 500
Debt instrument interest rate |  |  | 0.00% |  |  | 0.00% | 0.00% | 0.00% |  | 0.00% | 0.00%
Debt instrument maturity date |  |  |  |  |  | 2024 | 2024 | 2024 |  |  |
Long-term debt, carrying amount |  |  | $ 588,000 |  |  | $ 588,000 |  | $ 551,000 |  |  |
3.00% Senior Notes due 2020 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate |  |  |  |  |  |  | 3.00% |  |  |  | 3.00%
Debt instrument maturity date |  |  |  |  |  | 2020 |  |  |  |  |
Debt instrument, repurchase amount |  |  | $ 783,000 |  |  | $ 783,000 |  |  |  |  |
3.30% Senior Notes due 2021 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate |  |  |  |  |  |  | 3.625% |  |  |  | 3.625%
Debt instrument maturity date |  |  |  |  |  | 2022 |  |  |  |  |
Debt instrument, repurchase amount |  |  |  |  |  |  | $ 321,000 |  |  |  |
3.90% Senior Notes due 2028 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notes, face amount |  | $ 1,500 |  |  |  |  |  |  |  |  |
Debt instrument interest rate |  | 3.90% | 3.90% |  |  | 3.90% |  | 3.90% |  | 3.90% |
Debt instrument maturity date |  | 2028 |  |  |  | 2028 |  | 2028 |  |  |
Long-term debt, carrying amount |  |  | $ 1,449,000 |  |  | $ 1,449,000 |  | $ 1,444,000 |  |  |
3.00% Senior Notes due 2020 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate |  | 3.00% |  |  |  |  |  |  |  |  |
Debt instrument maturity date |  | 2020 |  |  |  |  |  |  |  |  |
Debt instrument, amount exchanged |  | $ 401,000 |  |  |  |  |  |  |  |  |
3.63% Senior Notes due 2022 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate |  | 3.63% | 3.63% |  |  | 3.63% |  | 3.63% |  | 3.63% |
Debt instrument maturity date |  | 2022 |  |  |  | 2022 |  | 2022 |  |  |
Long-term debt, carrying amount |  |  | $ 295,000 |  |  | $ 295,000 |  | $ 294,000 |  |  |
Debt instrument, amount exchanged |  | $ 234,000 |  |  |  |  |  |  |  |  |
4.00% Senior Notes due 2025 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate |  | 4.00% |  |  |  |  |  |  |  |  |
Debt instrument maturity date |  | 2025 |  |  |  |  |  |  |  |  |
Debt instrument, amount exchanged |  | $ 817,000 |  |  |  |  |  |  |  |  |
Commercial paper programs mature in April 2021 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Committed credit facility agreement aggregated |  |  | 1,810,000 |  |  | 1,810,000 |  |  |  |  |
Commercial paper programs mature in February 2023 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Committed credit facility agreement aggregated |  |  | 2,750,000 |  |  | 2,750,000 |  |  |  |  |
Commercial paper programs mature in July 2025 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Committed credit facility agreement aggregated |  |  | 1,500,000 |  |  | 1,500,000 |  |  |  |  |
Commercial paper programs mature in February 2025 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Committed credit facility agreement aggregated |  |  | 2,000,000 |  |  | 2,000,000 |  |  |  |  |
Commercial paper borrowings |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  | 1,080,000 |  |  | 1,080,000 |  | 2,220,000 |  |  |
Long-term debt, carrying amount |  |  | $ 1,077,000 |  |  | $ 1,077,000 |  | $ 2,222,000 |  |  |
Guaranteed Euro Medium Term Note Program |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt, carrying amount | € |  |  |  |  |  |  |  |  | € 5,000 |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Committed credit facility agreement aggregated | € |  |  |  |  |  |  |  |  | € 1,540 |  |
Credit facility extended period |  |  |  | 1 year |  |  |  |  |  |  |
Credit facility drawn | $ 0 |  |  |  |  |  |  |  |  |  |

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