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EMPLOYEE RETIREMENT PLANS - Assumptions - General Disclosures (Details) - USD ($)
$ in Millions
12 Months Ended 120 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Private Equity And Hedge Funds [Member]        
Assumptions        
Private equity funds $ 19 $ 93   $ 19
Defined-benefit pension plans        
Assumptions        
Discount rate for obligations (as a percent) 2.50% 3.80% 3.30% 2.50%
Expected return on plan assets (as a percent) 3.00% 7.00% 7.25%  
Actual annual rate of return on pension plan assets (as a percent) 17.70% 4.90% 13.90% 7.40%
Defined-benefit pension plans | Equity securities        
Assumptions        
Asset allocation (as a percent) 30.00%     30.00%
Defined-benefit pension plans | Debt securities        
Assumptions        
Asset allocation (as a percent) 65.00%     65.00%
Defined-benefit pension plans | Alternative investments        
Assumptions        
Asset allocation (as a percent) 5.00%     5.00%
Defined-benefit pension plans | Minimum        
Assumptions        
Discount rate for obligations (as a percent) 1.10% 1.50% 1.50% 1.10%
Liabilities having a discount rate for obligations (as a percent) 2.40% 4.10% 3.40% 2.40%
Defined-benefit pension plans | Maximum        
Assumptions        
Discount rate for obligations (as a percent) 3.00% 4.20% 3.60% 3.00%
Foreign Plan [Member] | Defined-benefit pension plans        
Assumptions        
Expected return on plan assets (as a percent) 3.90%