XML 101 R91.htm IDEA: XBRL DOCUMENT v3.8.0.1
SHORT-TERM DEBT (Details)
Dec. 01, 2016
USD ($)
Dec. 31, 2016
USD ($)
line_of_credit
Dec. 31, 2015
USD ($)
Revolving Credit Facility | Alliance Bernstein      
Short-term Debt, Unclassified [Abstract]      
Maximum borrowing capacity $ 200,000,000    
Debt Instrument, Term 364 days    
Line of credit facility, amount outstanding $ 0    
Revolving Credit Facility | Commercial Banks and Other Lenders | Alliance Bernstein      
Short-term Debt, Unclassified [Abstract]      
Maximum borrowing capacity   $ 1,000,000,000  
Line of credit facility, amount outstanding   0 $ 0
Incremental amount in principal allowed (up to)   250,000,000  
Revolving Credit Facility | Commercial Paper | Alliance Bernstein      
Short-term Debt, Unclassified [Abstract]      
Maximum borrowing capacity   $ 1,000,000,000  
Line of Credit | Financial Institutions | Alliance Bernstein      
Short-term Debt, Unclassified [Abstract]      
Number of uncommitted lines of credit | line_of_credit   4  
Line of Credit | Financial Institutions | SCB LLC      
Short-term Debt, Unclassified [Abstract]      
Line of credit facility, amount outstanding   $ 0 0
Number of uncommitted lines of credit | line_of_credit   4  
Incremental amount in principal allowed (up to)   $ 225,000,000  
Number of lines of credit with aggregate borrowing capacity | line_of_credit   3  
Number of lines of credit with no stated credit limit | line_of_credit   1  
Commercial Paper      
Debt, Short-term, Combined Amount [Abstract]      
Total short-term debt   $ 513,000,000 $ 584,000,000
Debt Instrument, Interest Rate, Stated Percentage   0.90% 0.50%