DEBT - Long-term Debt, including Current Portion (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total long-term debt	$ 8,057	$ 8,067
Less current portion of long-term debt	(1,047)	(248)
Long-term debt less current portion	7,010	7,819
Debentures | 3.875% debentures due 2020
Debt Instrument [Line Items]
Total long-term debt	$ 0	239
Debt instrument, stated interest rate (as a percent)	3.875%
Related long term debt converted to floating interest rates by interest rate swaps	$ 150
Debentures | 8.10% debentures due 2022
Debt Instrument [Line Items]
Total long-term debt	$ 100	100
Debt instrument, stated interest rate (as a percent)	8.10%
Related long term debt converted to floating interest rates by interest rate swaps	$ 100
Debentures | 6.50% debentures due 2025
Debt Instrument [Line Items]
Total long-term debt	$ 145	145
Debt instrument, stated interest rate (as a percent)	6.50%
Debentures | 7.65% debentures due 2029
Debt Instrument [Line Items]
Total long-term debt	$ 200	200
Debt instrument, stated interest rate (as a percent)	7.65%
Related long term debt converted to floating interest rates by interest rate swaps	$ 50
Debentures | 5.45% debentures due 2034
Debt Instrument [Line Items]
Total long-term debt	$ 136	137
Debt instrument, stated interest rate (as a percent)	5.45%
Related long term debt converted to floating interest rates by interest rate swaps	$ 25
Notes | 3.47% notes due 2021
Debt Instrument [Line Items]
Total long-term debt	$ 300	300
Debt instrument, stated interest rate (as a percent)	3.47%
Related long term debt converted to floating interest rates by interest rate swaps	$ 275
Notes | 0.02% Euro notes due 2021
Debt Instrument [Line Items]
Total long-term debt	$ 737	674
Debt instrument, stated interest rate (as a percent)	0.02%
Notes | 3.68% notes due 2023
Debt Instrument [Line Items]
Total long-term debt	$ 300	300
Debt instrument, stated interest rate (as a percent)	3.68%
Related long term debt converted to floating interest rates by interest rate swaps	$ 200
Notes | 0.70% Euro notes due 2025
Debt Instrument [Line Items]
Total long-term debt	$ 614	562
Debt instrument, stated interest rate (as a percent)	0.70%
Notes | 5.80% notes due 2037
Debt Instrument [Line Items]
Total long-term debt	$ 240	240
Debt instrument, stated interest rate (as a percent)	5.80%
Notes | 5.25% to 7.875% notes (maturities ranging from 2024 to 2035)
Debt Instrument [Line Items]
Total long-term debt	$ 165	165
Related long term debt converted to floating interest rates by interest rate swaps	$ 25
Notes | 5.25% to 7.875% notes (maturities ranging from 2024 to 2035) | Minimum
Debt Instrument [Line Items]
Debt instrument, stated interest rate (as a percent)	5.25%
Notes | 5.25% to 7.875% notes (maturities ranging from 2024 to 2035) | Maximum
Debt Instrument [Line Items]
Debt instrument, stated interest rate (as a percent)	7.875%
Senior notes | 2.75% senior notes due 2022
Debt Instrument [Line Items]
Total long-term debt	$ 1,600	1,600
Debt instrument, stated interest rate (as a percent)	2.75%
Related long term debt converted to floating interest rates by interest rate swaps	$ 1,400
Senior notes | 0.75% Euro notes due 2024
Debt Instrument [Line Items]
Total long-term debt	$ 676	617
Debt instrument, stated interest rate (as a percent)	0.75%
Senior notes | 3.10% senior notes due 2027
Debt Instrument [Line Items]
Total long-term debt	$ 700	700
Debt instrument, stated interest rate (as a percent)	3.10%
Senior notes | 4.00% senior notes due 2032
Debt Instrument [Line Items]
Total long-term debt	$ 700	700
Debt instrument, stated interest rate (as a percent)	4.00%
Senior notes | 4.15% senior notes due 2042
Debt Instrument [Line Items]
Total long-term debt	$ 1,000	1,000
Debt instrument, stated interest rate (as a percent)	4.15%
Senior notes | 3.92% senior notes due 2047
Debt Instrument [Line Items]
Total long-term debt	$ 300	300
Debt instrument, stated interest rate (as a percent)	3.92%
Other long-term debt
Debt Instrument [Line Items]
Total long-term debt	$ 144	$ 88