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DEBT - Schedule of Outstanding Debt (Details) € in Millions, $ in Millions | Sep. 30, 2021 USD ($) | Sep. 30, 2021 EUR (€) | Mar. 31, 2021 EUR (€) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 EUR (€) | Apr. 30, 2020 USD ($) | Aug. 31, 2017 | Mar. 31, 2017 | May 31, 2016 | Nov. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2014 | Aug. 31, 2014 USD ($)
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Current Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value | $ 1,158 |  |  | $ 985 |  |  |  |  |  |  |  |  |
Long-term debt: |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value | 9,876 |  |  | 11,029 |  |  |  |  |  |  |  |  |
Total long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt: |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Principal Amount | 10,020 |  |  | 11,201 |  |  |  |  |  |  |  |  |
Unamortized Debt Discount and Debt Issuance Cost | (144) |  |  | (172) |  |  |  |  |  |  |  |  |
Carrying Value | 9,876 |  |  | 11,029 |  |  |  |  |  |  |  |  |
0.9% Convertible Senior Notes due September 2021 | Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt: |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000
Stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 0.90%
0.9% Convertible Senior Notes due September 2021 | Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Current Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value |  |  |  | 985 |  |  |  |  |  |  |  |  |
Long-term debt: |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Principal Amount |  |  |  | 1,000 |  |  |  |  |  |  |  |  |
Unamortized Debt Discount and Debt Issuance Cost |  |  |  | $ (15) |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 0.90% | 0.90% |  |  |  |  |  |  |  |
0.8% (€1 billion) Senior Notes due March 2022 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt: |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Principal Amount |  |  |  | $ 1,223 |  |  |  |  |  |  |  |  |
Unamortized Debt Discount and Debt Issuance Cost |  |  |  | (1) |  |  |  |  |  |  |  |  |
Carrying Value |  |  |  | $ 1,222 |  |  |  |  |  |  |  |  |
Aggregate principal amount | € |  |  |  |  | € 1,000 |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 0.80% | 0.80% |  |  | 0.80% |  |  |  |  |
0.8% (€1 billion) Senior Notes due March 2022 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Current Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value | 1,158 |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt: |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Principal Amount | 1,159 |  |  |  |  |  |  |  |  |  |  |  |
Unamortized Debt Discount and Debt Issuance Cost | $ (1) |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | € |  | € 1,000 |  |  |  |  |  |  |  |  |  |  |
Stated interest rate | 0.80% | 0.80% |  |  |  |  |  |  |  |  |  |  |
2.15% (€750 million) Senior Notes due November 2022 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt: |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Principal Amount | $ 869 |  |  | $ 919 |  |  |  |  |  |  |  |  |
Unamortized Debt Discount and Debt Issuance Cost | (1) |  |  | (4) |  |  |  |  |  |  |  |  |
Carrying Value | $ 868 |  |  | $ 915 |  |  |  |  |  |  |  |  |
Aggregate principal amount | € |  | € 750 |  |  | € 750 |  |  |  |  |  |  |  |
Stated interest rate | 2.15% | 2.15% |  | 2.15% | 2.15% |  |  |  |  | 2.15% |  |  |
2.75% Senior Notes due March 2023 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt: |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Principal Amount | $ 500 |  |  | $ 500 |  |  |  |  |  |  |  |  |
Unamortized Debt Discount and Debt Issuance Cost | (1) |  |  | (1) |  |  |  |  |  |  |  |  |
Carrying Value | $ 499 |  |  | $ 499 |  |  |  |  |  |  |  |  |
Stated interest rate | 2.75% | 2.75% |  | 2.75% | 2.75% |  | 2.75% |  |  |  |  |  |
2.375% (€1 billion) Senior Notes due September 2024 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt: |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Principal Amount | $ 1,159 |  |  | $ 1,223 |  |  |  |  |  |  |  |  |
Unamortized Debt Discount and Debt Issuance Cost | (5) |  |  | (7) |  |  |  |  |  |  |  |  |
Carrying Value | $ 1,154 |  |  | $ 1,216 |  |  |  |  |  |  |  |  |
Aggregate principal amount | € |  | € 1,000 |  |  | € 1,000 |  |  |  |  |  |  |  |
Stated interest rate | 2.375% | 2.375% |  | 2.375% | 2.375% |  |  |  |  |  |  | 2.375% |
3.65% Senior Notes due March 2025 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt: |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Principal Amount | $ 500 |  |  | $ 500 |  |  |  |  |  |  |  |  |
Unamortized Debt Discount and Debt Issuance Cost | (2) |  |  | (2) |  |  |  |  |  |  |  |  |
Carrying Value | $ 498 |  |  | $ 498 |  |  |  |  |  |  |  |  |
Stated interest rate | 3.65% | 3.65% |  | 3.65% | 3.65% |  |  |  |  |  | 3.65% |  |
0.1% (€950 million) Senior Notes due March 2025 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt: |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Principal Amount | $ 1,101 |  | € 950 |  |  |  |  |  |  |  |  |  |
Unamortized Debt Discount and Debt Issuance Cost | (5) |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value | $ 1,096 |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | € |  | € 950 |  |  |  |  |  |  |  |  |  |  |
Stated interest rate | 0.10% | 0.10% | 0.10% |  |  |  |  |  |  |  |  |  |
4.1% Senior Notes due April 2025 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt: |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Principal Amount |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |
Unamortized Debt Discount and Debt Issuance Cost |  |  |  | (5) |  |  |  |  |  |  |  |  |
Carrying Value |  |  |  | $ 995 |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 4.10% | 4.10% |  |  |  |  |  |  |  |
0.75% Convertible Senior Notes due May 2025 | Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt: |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Principal Amount | $ 863 |  |  | $ 863 |  |  |  |  |  |  |  |  |
Unamortized Debt Discount and Debt Issuance Cost | (106) |  |  | (128) |  |  |  |  |  |  |  |  |
Carrying Value | $ 757 |  |  | $ 735 |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  | $ 863 |  |  |  |  |  |  |
Stated interest rate | 0.75% | 0.75% |  | 0.75% | 0.75% | 0.75% |  |  |  |  |  |  |
3.6% Senior Notes due June 2026 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt: |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Principal Amount | $ 1,000 |  |  | $ 1,000 |  |  |  |  |  |  |  |  |
Unamortized Debt Discount and Debt Issuance Cost | (4) |  |  | (4) |  |  |  |  |  |  |  |  |
Carrying Value | $ 996 |  |  | $ 996 |  |  |  |  |  |  |  |  |
Stated interest rate | 3.60% | 3.60% |  | 3.60% | 3.60% |  |  |  | 3.60% |  |  |  |
1.8% (€1 billion) Senior Notes due March 2027 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt: |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Principal Amount | $ 1,159 |  |  | $ 1,223 |  |  |  |  |  |  |  |  |
Unamortized Debt Discount and Debt Issuance Cost | (3) |  |  | (2) |  |  |  |  |  |  |  |  |
Carrying Value | $ 1,156 |  |  | $ 1,221 |  |  |  |  |  |  |  |  |
Aggregate principal amount | € |  | € 1,000 |  |  | € 1,000 |  |  |  |  |  |  |  |
Stated interest rate | 1.80% | 1.80% |  | 1.80% | 1.80% |  |  |  |  |  | 1.80% |  |
4.5% Senior Notes due April 2027 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt: |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Principal Amount |  |  |  | $ 750 |  |  |  |  |  |  |  |  |
Unamortized Debt Discount and Debt Issuance Cost |  |  |  | (5) |  |  |  |  |  |  |  |  |
Carrying Value |  |  |  | $ 745 |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 4.50% | 4.50% |  |  |  |  |  |  |  |
3.55% Senior Notes due March 2028 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt: |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Principal Amount | $ 500 |  |  | $ 500 |  |  |  |  |  |  |  |  |
Unamortized Debt Discount and Debt Issuance Cost | (2) |  |  | (2) |  |  |  |  |  |  |  |  |
Carrying Value | $ 498 |  |  | $ 498 |  |  |  |  |  |  |  |  |
Stated interest rate | 3.55% | 3.55% |  | 3.55% | 3.55% |  | 3.55% |  |  |  |  |  |
0.5% (€750 million) Senior Notes due March 2028 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt: |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Principal Amount | $ 869 |  | € 750 |  |  |  |  |  |  |  |  |  |
Unamortized Debt Discount and Debt Issuance Cost | (5) |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value | $ 864 |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | € |  | € 750 |  |  |  |  |  |  |  |  |  |  |
Stated interest rate | 0.50% | 0.50% | 0.50% |  |  |  |  |  |  |  |  |  |
4.625% Senior Notes due April 2030 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt: |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Principal Amount | $ 1,500 |  |  | $ 1,500 |  |  |  |  |  |  |  |  |
Unamortized Debt Discount and Debt Issuance Cost | (10) |  |  | (11) |  |  |  |  |  |  |  |  |
Carrying Value | $ 1,490 |  |  | $ 1,489 |  |  |  |  |  |  |  |  |
Stated interest rate | 4.625% | 4.625% |  | 4.625% | 4.625% | 4.625% |  |  |  |  |  |  |

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