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LONG-TERM DEBT - Detail on Long-term Debt Balances (Details) - USD ($) | Dec. 31, 2021 | Sep. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Credit Facility | $ 1,050,000,000 |  |  | $ 900,000,000
Finance lease obligations | 146,000,000 |  |  | 153,000,000
Other | 135,000,000 |  |  | 143,000,000
Long-term debt | 10,138,000,000 |  |  | 10,376,000,000
Less current portion | (805,000,000) |  |  | (1,173,000,000)
Long-term debt, noncurrent | 9,333,000,000 |  |  | 9,203,000,000
Series L Notes, interest rate of 3.3%, face amount of $173, maturing September 15, 2022 (effective interest rate of 3.4%) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes | $ 173,000,000 |  |  | 173,000,000
Series L Notes, interest rate of 3.3%, face amount of $173, maturing September 15, 2022 (effective interest rate of 3.4%) | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes, interest rate | 3.30% |  |  |
Senior notes, face amount | $ 173,000,000 |  |  |
Senior notes, effective interest rate | 3.40% |  |  |
Series N Notes, interest rate of 3.1%, face amount of $400, redeemed August 9, 2021 (effective interest rate of 3.4%) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes | $ 0 |  |  | 399,000,000
Series N Notes, interest rate of 3.1%, face amount of $400, redeemed August 9, 2021 (effective interest rate of 3.4%) | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes, interest rate | 3.10% |  |  |
Senior notes, face amount | $ 400,000,000 |  |  |
Senior notes, effective interest rate | 3.40% |  |  |
Series O Notes, interest rate of 2.9%, face amount of $450, matured March 1, 2021 (effective interest rate of 3.1%) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes | $ 0 |  |  | 450,000,000
Series O Notes, interest rate of 2.9%, face amount of $450, matured March 1, 2021 (effective interest rate of 3.1%) | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes, interest rate | 2.90% |  |  |
Senior notes, face amount | $ 450,000,000 |  |  |
Senior notes, effective interest rate | 3.10% |  |  |
Series P Notes, interest rate of 3.8%, face amount of $350, maturing October 1, 2025 (effective interest rate of 4.0%) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes | $ 347,000,000 |  |  | 346,000,000
Series P Notes, interest rate of 3.8%, face amount of $350, maturing October 1, 2025 (effective interest rate of 4.0%) | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes, interest rate | 3.80% |  |  |
Senior notes, face amount | $ 350,000,000 |  |  |
Senior notes, effective interest rate | 4.00% |  |  |
Series Q Notes, interest rate of 2.3%, face amount of $399, matured January 15, 2022 (effective interest rate of 2.5%) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes | $ 399,000,000 |  |  | 398,000,000
Series Q Notes, interest rate of 2.3%, face amount of $399, matured January 15, 2022 (effective interest rate of 2.5%) | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes, interest rate | 2.30% |  |  |
Senior notes, face amount | $ 399,000,000 |  |  |
Senior notes, effective interest rate | 2.50% |  |  |
Series R Notes, interest rate of 3.1%, face amount of $750, maturing June 15, 2026 (effective interest rate of 3.3%) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes | $ 746,000,000 |  |  | 745,000,000
Series R Notes, interest rate of 3.1%, face amount of $750, maturing June 15, 2026 (effective interest rate of 3.3%) | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes, interest rate | 3.10% |  |  |
Senior notes, face amount | $ 750,000,000 |  |  |
Senior notes, effective interest rate | 3.30% |  |  |
Series U Notes, interest rate of 3.1%, face amount of $291, maturing February 15, 2023 (effective interest rate of 3.1%) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes | $ 291,000,000 |  |  | 291,000,000
Series U Notes, interest rate of 3.1%, face amount of $291, maturing February 15, 2023 (effective interest rate of 3.1%) | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes, interest rate | 3.10% |  |  |
Senior notes, face amount | $ 291,000,000 |  |  |
Senior notes, effective interest rate | 3.10% |  |  |
Series V Notes, interest rate of 3.8%, face amount of $318, maturing March 15, 2025 (effective interest rate of 2.8%) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes | $ 327,000,000 |  |  | 330,000,000
Series V Notes, interest rate of 3.8%, face amount of $318, maturing March 15, 2025 (effective interest rate of 2.8%) | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes, interest rate | 3.80% |  |  |
Senior notes, face amount | $ 318,000,000 |  |  |
Senior notes, effective interest rate | 2.80% |  |  |
Series W Notes, interest rate of 4.5%, face amount of $278, maturing October 1, 2034 (effective interest rate of 4.1%) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes | $ 290,000,000 |  |  | 290,000,000
Series W Notes, interest rate of 4.5%, face amount of $278, maturing October 1, 2034 (effective interest rate of 4.1%) | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes, interest rate | 4.50% |  |  |
Senior notes, face amount | $ 278,000,000 |  |  |
Senior notes, effective interest rate | 4.10% |  |  |
Series X Notes, interest rate of 4.0%, face amount of $450, maturing April 15, 2028 (effective interest rate of 4.2%) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes | $ 445,000,000 |  |  | 445,000,000
Series X Notes, interest rate of 4.0%, face amount of $450, maturing April 15, 2028 (effective interest rate of 4.2%) | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes, interest rate | 4.00% |  |  |
Senior notes, face amount | $ 450,000,000 |  |  |
Senior notes, effective interest rate | 4.20% |  |  |
Series Z Notes, interest rate of 4.2%, face amount of $350, maturing December 1, 2023 (effective interest rate of 4.4%) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes | $ 349,000,000 |  |  | 348,000,000
Series Z Notes, interest rate of 4.2%, face amount of $350, maturing December 1, 2023 (effective interest rate of 4.4%) | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes, interest rate | 4.20% |  |  |
Senior notes, face amount | $ 350,000,000 |  |  |
Senior notes, effective interest rate | 4.40% |  |  |
Series AA Notes, interest rate of 4.7%, face amount of $300, maturing December 1, 2028 (effective interest rate of 4.8%) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes | $ 297,000,000 |  |  | 297,000,000
Series AA Notes, interest rate of 4.7%, face amount of $300, maturing December 1, 2028 (effective interest rate of 4.8%) | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes, interest rate | 4.70% |  |  |
Senior notes, face amount | $ 300,000,000 |  |  |
Senior notes, effective interest rate | 4.80% |  |  |
Series BB Notes, floating rate, face amount of $300, matured March 8, 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes | $ 0 |  |  | 300,000,000
Series BB Notes, floating rate, face amount of $300, matured March 8, 2021 | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes, face amount | 300,000,000 |  |  |
Series CC Notes, interest rate of 3.6%, face amount of $550, maturing April 15, 2024 (effective interest rate of 3.9%) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes | $ 566,000,000 |  |  | 586,000,000
Series CC Notes, interest rate of 3.6%, face amount of $550, maturing April 15, 2024 (effective interest rate of 3.9%) | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes, interest rate | 3.60% |  |  |
Senior notes, face amount | $ 550,000,000 |  |  |
Senior notes, effective interest rate | 3.90% |  |  |
Series DD Notes, interest rate of 2.1%, face amount of $224, maturing October 3, 2022 (effective interest rate of 1.2%) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes | $ 226,000,000 |  |  | 228,000,000
Series DD Notes, interest rate of 2.1%, face amount of $224, maturing October 3, 2022 (effective interest rate of 1.2%) | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes, interest rate | 2.10% |  |  |
Senior notes, face amount | $ 224,000,000 |  |  |
Senior notes, effective interest rate | 1.20% |  |  |
Series EE Notes, interest rate of 5.8%, face amount of $600, maturing May 1, 2025 (effective interest rate of 6.0%) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes | $ 595,000,000 |  |  | 1,583,000,000
Series EE Notes, interest rate of 5.8%, face amount of $600, maturing May 1, 2025 (effective interest rate of 6.0%) | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes, interest rate | 5.80% | 5.75% |  |
Senior notes, face amount | $ 600,000,000 |  |  |
Senior notes, effective interest rate | 6.00% |  |  |
Series FF Notes, interest rate of 4.6%, face amount of $1,000, maturing June 15, 2030 (effective interest rate of 4.8%) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes | $ 987,000,000 |  |  | 986,000,000
Series FF Notes, interest rate of 4.6%, face amount of $1,000, maturing June 15, 2030 (effective interest rate of 4.8%) | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes, interest rate | 4.60% |  |  |
Senior notes, face amount | $ 1,000,000,000 |  |  |
Senior notes, effective interest rate | 4.80% |  |  |
Series GG Notes, interest rate of 3.5%, face amount of $1,000, maturing October 15, 2032 (effective interest rate of 3.7%) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes | $ 986,000,000 |  |  | 985,000,000
Series GG Notes, interest rate of 3.5%, face amount of $1,000, maturing October 15, 2032 (effective interest rate of 3.7%) | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes, interest rate | 3.50% |  |  |
Senior notes, face amount | $ 1,000,000,000 |  |  |
Senior notes, effective interest rate | 3.70% |  |  |
Series HH Notes, interest rate of 2.9%, face amount of $1,100, maturing April 15, 2031 (effective interest rate of 3.0%) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes | $ 1,090,000,000 |  |  | 0
Series HH Notes, interest rate of 2.9%, face amount of $1,100, maturing April 15, 2031 (effective interest rate of 3.0%) | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes, interest rate | 2.90% |  | 2.85% |
Senior notes, face amount | $ 1,100,000,000 |  | $ 1,100,000,000 |
Senior notes, effective interest rate | 3.00% |  |  |
Series II Notes, interest rate of 2.8%, face amount of $700, maturing October 15, 2033 (effective interest rate of 2.8%) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes | $ 693,000,000 |  |  | $ 0
Series II Notes, interest rate of 2.8%, face amount of $700, maturing October 15, 2033 (effective interest rate of 2.8%) | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes, interest rate | 2.80% | 2.75% |  |
Senior notes, face amount | $ 700,000,000 | $ 700,000,000 |  |
Senior notes, effective interest rate | 2.80% |  |  |

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