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DEBT - Narrative (Details) € in Millions | Oct. 04, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 22, 2021 USD ($) | May 17, 2021 USD ($) | Mar. 08, 2021 USD ($) tranche | Mar. 08, 2021 EUR (€) | Dec. 31, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 08, 2021 EUR (€) tranche
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Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  | $ 2,500,000,000 | $ 4,500,000,000 |  |  |  |  |
Borrowings outstanding |  |  |  |  |  |  | $ 0 |  |
Letter of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  |  |  |  | 972,000,000 |  |
Letters of credit outstanding, amount |  |  |  |  |  |  | $ 335,000,000 |  |
3.68% notes due 2023 | Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, stated interest rate (as a percent) |  |  |  |  |  |  | 3.68% |  |
0.75% Euro notes due 2024 | Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, stated interest rate (as a percent) |  |  |  |  |  |  | 0.75% |  |
0.70% Euro notes due 2025 | Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, stated interest rate (as a percent) |  |  |  |  |  |  | 0.70% |  |
Euro Notes (2021) due 2026 and 2030 | Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  | $ 1,798,000,000 |  |  |  | € 1,500
Number of tranches | tranche |  |  |  |  | 2 |  |  |  | 2
Proceeds from issuance of debt |  |  |  |  | $ 1,790,000,000 | € 1,494 |  |  |
Debt redemption price, percentage |  |  |  |  | 101.00% | 101.00% |  |  |
Euro Notes (2021) due 2026 and 2030 | Notes | Tranche One |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, stated interest rate (as a percent) |  |  |  |  | 0.128% |  | 0.128% |  | 0.128%
Face amount | € |  |  |  |  |  |  |  |  | € 900
Euro Notes (2021) due 2026 and 2030 | Notes | Tranche Two |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, stated interest rate (as a percent) |  |  |  |  | 0.577% |  | 0.577% |  | 0.577%
Face amount | € |  |  |  |  |  |  |  |  | € 600
364 Day Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  | $ 500,000,000 | $ 500,000,000 | $ 2,500,000,000 |  |  | $ 500,000,000 |  |
Debt instrument, term (in years) | 364 days | 364 days | 364 days | 364 days |  |  |  |  |
Commercial Paper | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity | $ 2,500,000,000 |  | $ 2,500,000,000 |  |  |  | 2,500,000,000 | $ 4,500,000,000 |
Line of credit, current |  |  |  |  |  |  |  | $ 3,372,000,000 |
Five Year Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  | $ 750,000,000 |  |  |  |  | $ 2,000,000,000 |  |
Long-term debt, term | 5 years | 5 years |  |  |  |  |  |  |
Four Year Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  | $ 500,000,000 |  |  |  |  |  |  |
Long-term debt, term |  | 4 years |  |  |  |  |  |  |

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