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DEBT - Narrative (Details) $ in Millions | 1 Months Ended | 24 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2020 JPY (¥) numberOfPayments | Feb. 29, 2020 USD ($) | May 31, 2017 USD ($) | May 31, 2016 USD ($) | Jun. 30, 2015 | May 31, 2017 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs and discounts, net of amortization |  |  |  |  |  |  | $ (24) | $ (24) |  |  |
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  |  | $ 2,800 |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  |  | $ 3,000 |  |
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt principal amount |  |  |  |  |  |  |  |  |  | $ 1,800 |
Debt Issuance Costs, Gross |  |  | $ 24 |  |  | $ 24 |  |  |  |  |
Senior Notes [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis points |  |  |  |  |  | 20.00% |  |  |  |  |
Senior Notes [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis points |  |  |  |  |  | 25.00% |  |  |  |  |
Senior Notes [Member] | Debt Instrument, Redemption, Period Two |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Redemption price |  |  |  |  |  | 100.00% |  |  |  |  |
Senior Notes [Member] | Debt Instrument, Redemption, Period One |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Redemption price |  |  |  |  |  | 101.00% |  |  |  |  |
Line of Credit [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding lines of credit |  |  |  |  |  |  | $ 0 |  |  |  |
Senior Notes, 4.20% due 2047 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt principal amount |  |  | $ 400 |  |  | $ 400 |  |  |  |  |
Interest rate |  |  | 4.20% |  |  | 4.20% | 4.20% |  |  |  |
Debt Instrument, Term |  |  | 30 years |  |  |  |  |  |  |  |
Senior Notes, 3.75% due 2046 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt principal amount |  |  |  | $ 400 |  |  |  |  |  |  |
Interest rate |  |  |  | 3.75% |  |  | 3.75% |  |  |  |
Debt Instrument, Term |  |  |  | 30 years |  |  |  |  |  |  |
Senior Notes, 4.60% due 2045 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt principal amount |  |  |  |  |  |  |  |  |  |  | $ 1,000
Interest rate |  |  |  |  |  |  | 4.60% |  |  |  | 4.60%
Debt Instrument, Term |  |  |  |  | 30 years |  |  |  |  |  |
Unsecured Senior Notes, 1.85% | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt principal amount |  | $ 500 |  |  |  |  |  |  |  |  |
Interest rate |  | 1.85% |  |  |  |  | 1.85% |  |  |  |
Basis points |  | 0.10% |  |  |  |  |  |  |  |  |
Redemption price, percentage upon change of control |  | 101.00% |  |  |  |  |  |  |  |  |
Redemption price |  | 100.00% |  |  |  |  |  |  |  |  |
Debt issuance costs and discounts, net of amortization |  | $ 5 |  |  |  |  |  |  |  |  |
Term Loan Agreement, 0.05% [Member] | Yen Denominated Bank Term Loan |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt principal amount | ¥ | ¥ 9,000,000,000 |  |  |  |  |  |  |  |  |  |
Number of semi-annual principal payments | numberOfPayments | 4 |  |  |  |  |  |  |  |  |  |
Average interest rate | 0.05% |  |  |  |  |  |  |  |  |  |

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