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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 ($)	Jun. 30, 2015	May 31, 2017 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2018 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015
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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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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