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Long-term Debt - Additional Information (Detail) € in Millions, $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) | Mar. 31, 2020 EUR (€) | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jun. 30, 2021 EUR (€) | Jun. 30, 2020 EUR (€) | Dec. 31, 2019 EUR (€)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt, fair value |  |  | $ 16,700 | $ 17,300 |  |  |
Committed credit facility agreement aggregated |  |  | $ 5,750 |  |  |  |
Credit facility extended date |  |  | Jun. 30, 2024 |  |  |  |
Unused credit facility |  |  | $ 5,560 |  |  |  |
Redemption Premium | $ 40 |  |  |  |  |  |
Long-term debt, carrying amount |  |  | 15,687 | $ 16,036 |  |  |
3.30% Senior Notes due 2021 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes, face amount | $ 935 |  | $ 665 |  |  |  |
Debt instrument interest rate | 3.30% |  |  |  |  | 3.30% |
Debt instrument maturity date | 2021 |  |  |  |  |  |
0.25% Notes due 2027 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes, face amount | € |  | € 400 |  |  |  |  | € 500
Debt instrument interest rate |  | 0.25% | 0.25% | 0.25% | 0.25% |  |
Debt instrument maturity date |  | 2027 | 2027 | 2027 |  |  |
Long-term debt, carrying amount |  |  | $ 1,072 | $ 1,100 |  |  |
0.50% Notes due 2031 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes, face amount | € |  | € 400 |  |  |  |  | € 500
Debt instrument interest rate |  | 0.50% | 0.50% | 0.50% | 0.50% |  |
Debt instrument maturity date |  | 2031 | 2031 | 2031 |  |  |
Long-term debt, carrying amount |  |  | $ 1,071 | $ 1,099 |  |  |
1.375% Guaranteed 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% |
Debt instrument maturity date | 2026 |  | 2026 | 2026 |  |  |
Long-term debt, carrying amount |  |  | $ 1,191 | $ 1,221 |  |  |
2.65% Senior Notes due 2030 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes, face amount | $ 900 |  |  |  |  |  |
Debt instrument interest rate | 2.65% |  |  |  |  | 2.65% |
Debt instrument maturity date | 2030 |  |  |  |  |  |
2.0% Guaranteed 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% |
Debt instrument maturity date | 2032 |  | 2032 | 2032 |  |  |
Long-term debt, carrying amount |  |  | $ 1,184 | $ 1,214 |  |  |
4.20% Senior Notes due 2021 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes, face amount | $ 600 |  |  |  |  |  |
Debt instrument interest rate | 4.20% |  |  |  |  | 4.20% |
Debt instrument maturity date | 2021 |  |  |  |  |  |
Commercial paper programs mature in February 2023 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Committed credit facility agreement aggregated |  |  | 2,750 |  |  |  |
Commercial paper programs mature in July 2025 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Committed credit facility agreement aggregated |  |  | 1,000 |  |  |  |
Commercial paper programs mature in February 2025 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Committed credit facility agreement aggregated |  |  | 2,000 |  |  |  |
Commercial paper borrowings |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  |  | 200 | 400 |  |  |
Long-term debt, carrying amount |  |  | $ 192 | $ 393 |  |  |
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 |  |  | 3 years |  |  |  |
Reduced size of credit facility | € |  |  |  |  | € 750 |  |
Credit facility drawn |  |  | $ 0 |  |  |  |

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