FAIR VALUE ACCOUNTING - Quantitative Information (Details) - Level 3 $ in Millions	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Quantitative and Qualitative Information - Unobservable Inputs
Contingent consideration assets	$ 159	$ 119
Contingent consideration liabilities	5
Marketable equity securities
Quantitative and Qualitative Information - Unobservable Inputs
Marketable and other equity securities	$ 58	$ 53
Discounted cash flow | Minimum | Discount rate
Quantitative and Qualitative Information - Unobservable Inputs
Contingent consideration assets, measurement input	0.0454	0.0453
Contingent consideration liabilities, measurement input	0.0212
Discounted cash flow | Maximum | Discount rate
Quantitative and Qualitative Information - Unobservable Inputs
Contingent consideration assets, measurement input	0.0919	0.0919
Contingent consideration liabilities, measurement input	0.0311
Discounted cash flow | Weighted Average | Discount rate
Quantitative and Qualitative Information - Unobservable Inputs
Contingent consideration assets, measurement input	0.0792	0.0763
Contingent consideration liabilities, measurement input	0.0252
Discounted cash flow | Marketable equity securities | Discount rate
Quantitative and Qualitative Information - Unobservable Inputs
Marketable and other equity securities, measurement input	0.0950	0.0950
Discounted cash flow | Marketable equity securities | Long-term price (in dollars per ounce or pound) | Gold
Quantitative and Qualitative Information - Unobservable Inputs
Marketable and other equity securities, measurement input	1,500	1,500
Discounted cash flow | Marketable equity securities | Long-term price (in dollars per ounce or pound) | Copper
Quantitative and Qualitative Information - Unobservable Inputs
Marketable and other equity securities, measurement input	3.00	3.00