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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 ($) | Jun. 30, 2015 | May 31, 2017 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuance costs and discounts, net of amortization |  |  |  |  |  |  | $ (23) | $ (24) |  |
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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- Definition The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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