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CONSOLIDATED DEBT Revolving Credit Facility (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Line of Credit Facility [Line Items]    
Long-term Debt $ 2,473 $ 2,342
Long-term line of credit 665 606
Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Total facility commitment 900  
Long-term line of credit 278 212
Line of credit facility, remaining borrowing capacity 393  
Term Loan [Member]    
Line of Credit Facility [Line Items]    
Long-term Debt 387 $ 394
Letter of Credit [Member]    
Line of Credit Facility [Line Items]    
Letters of credit outstanding 38  
Letter of Credit [Member] | Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Letters of credit outstanding $ 229