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Long-term Debt - Additional Information (Detail) € in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) | Apr. 24, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2019 EUR (€)
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument premium paid |  | $ 48 |  |  |  |
Debt instrument premium paid on repurchase | $ 29 |  |  |  |  |
Long-term debt, fair value | 16,900 |  | $ 16,900 | $ 16,900 | $ 14,600 |
Committed credit facility agreement aggregated | 6,500 |  | 6,500 | 6,500 |  |
Unused credit facility | 4,100 |  | 4,100 | 4,100 |  |
Short-term borrowings and current portion of long-term debt | 340 |  | 340 | 340 | 1,407 |
Long-term Debt | 16,333 |  | 16,333 | 16,333 | 14,644 |
Commercial paper programs mature in February 2020 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Committed credit facility agreement aggregated | 1,000 |  | 1,000 | 1,000 |  |
Commercial paper programs mature in February 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Committed credit facility agreement aggregated | 2,000 |  | 2,000 | 2,000 |  |
Commercial paper programs mature in February 2024 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Committed credit facility agreement aggregated | 2,000 |  | 2,000 | 2,000 |  |
Commercial paper programs mature in July 2024 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Committed credit facility agreement aggregated | 1,500 |  | 1,500 | 1,500 |  |
Commercial paper borrowings |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | 2,400 |  | 2,400 | 2,400 | 2,400 |
Short-term borrowings and current portion of long-term debt | 300 |  | 300 | 300 |  |
Long-term Debt | $ 2,128 |  | $ 2,128 | $ 2,128 | $ 2,433 |
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% | 3.90%
Debt instrument maturity date |  | 2028 |  | 2028 | 2028 |
Long-term Debt | $ 1,442 |  | $ 1,442 | $ 1,442 |  |
3.00% Senior Notes due 2020 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, amount exchanged |  | $ 401 |  |  |  |
Debt instrument interest rate |  | 3.00% |  |  |  |
Debt instrument maturity date |  | 2020 |  |  |  |
Long-term Debt | $ 415 |  | $ 415 | $ 415 | $ 1,596 |
3.63% Senior Notes due 2022 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, amount exchanged |  | $ 234 |  |  |  |
Debt instrument interest rate |  | 3.63% |  |  |  |
Debt instrument maturity date |  | 2022 |  |  |  |
4.00% Senior Notes due 2025 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, amount exchanged |  | $ 817 |  |  |  |
Debt instrument interest rate | 4.00% | 4.00% | 4.00% | 4.00% | 4.00% | 4.00%
Debt instrument maturity date |  | 2025 |  | 2025 | 2025 |
0.00% Notes due 2024 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notes, face amount | € |  |  |  |  |  | € 500
Debt instrument interest rate | 0.00% |  | 0.00% | 0.00% | 0.00% | 0.00%
Debt instrument maturity date |  |  | 2024 | 2024 | 2024 |
Long-term Debt | $ 544 |  | $ 544 | $ 544 |  |
0.25% Notes due 2027 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notes, face amount | € |  |  |  |  |  | € 500
Debt instrument interest rate | 0.25% |  | 0.25% | 0.25% | 0.25% | 0.25%
Debt instrument maturity date |  |  | 2027 | 2027 | 2027 |
Long-term Debt | $ 543 |  | $ 543 | $ 543 |  |
0.50% Notes due 2031 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notes, face amount | € |  |  |  |  |  | € 500
Debt instrument interest rate | 0.50% |  | 0.50% | 0.50% | 0.50% | 0.50%
Debt instrument maturity date |  |  | 2031 | 2031 | 2031 |
Long-term Debt | $ 536 |  | $ 536 | $ 536 |  |
3.00% Senior Notes due 2020 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate | 3.00% |  | 3.00% | 3.00% | 3.00% | 3.00%
Debt instrument maturity date | 2020 |  |  | 2020 | 2020 |
Debt instrument, repurchase amount | $ 783 |  | $ 783 | $ 783 |  |
3.625% Senior Notes due 2022 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate | 3.625% |  | 3.625% | 3.625% |  | 3.625%
Debt instrument maturity date | 2022 |  |  |  |  |
Debt instrument, repurchase amount | $ 321 |  | $ 321 | $ 321 |  |

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