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COMMITMENTS AND CONTINGENT LIABILITIES (Details)
$ / policy in Millions, $ in Millions
1 Months Ended 12 Months Ended 19 Months Ended
Feb. 29, 2016
$ / policy
Dec. 31, 2017
USD ($)
line_of_credit
legal_action
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2012
USD ($)
Jan. 31, 2013
fund
Dec. 31, 2010
USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]              
Future minimum payments under non-cancelable operating leases - 2018   $ 214.0          
Future minimum payments under non-cancelable operating leases - 2019   207.0          
Future minimum payments under non-cancelable operating leases - 2020   177.0          
Future minimum payments under non-cancelable operating leases - 2021   169.0          
Future minimum payments under non-cancelable operating leases - 2022   156.0          
Future minimum payments under non-cancelable operating leases - thereafter   334.0          
Future Minimum Sublease Rentals, Sale Leaseback Transactions, Fiscal Year Maturity [Abstract]              
Minimum future sublease rental income under non-cancelable operating leases - 2018   56.0          
Minimum future sublease rental income under non-cancelable operating leases - 2019   58.0          
Minimum future sublease rental income under non-cancelable operating leases - 2020   41.0          
Minimum future sublease rental income under non-cancelable operating leases - 2021   40.0          
Minimum future sublease rental income under non-cancelable operating leases - 2022   37.0          
Minimum future sublease rental income under non-cancelable operating leases - thereafter   60.0          
Rent expense   142.9 $ 140.2 $ 137.7      
Sublease income   16.4 15.8 5.2      
Federal home loan bank stock   144.0          
Carrying value of collateral pledged for federal home loan bank   4,510.0          
Outstanding balance at end of year   3,000.0 2,238.0        
Issued during the Year   6,762.0 7,738.0        
Repaid during the year   6,000.0 6,000.0        
Advances from Federal Home Loan Banks, difference between carrying value and fair value   14.0          
Loss Contingencies [Line Items]              
Unaccrued amounts of reasonably possible range of losses   $ 90.0          
Number of individual actions challenging cost of insurance rate increases | legal_action   7          
Number of individual actions challenging cost of insurance rate increases transferred to federal court | legal_action   3          
Line of Credit | Financial Institutions              
Loss Contingencies [Line Items]              
Number of guarantees maintained | line_of_credit   4          
Federal Home Loan Bank of New York Short-Term Funding Agreements Maturing in Less than One Month              
Future Minimum Sublease Rentals, Sale Leaseback Transactions, Fiscal Year Maturity [Abstract]              
Outstanding balance at end of year   $ 500.0 500.0        
Issued during the Year   6,000.0 6,000.0        
Repaid during the year   6,000.0 6,000.0        
Federal Home Loan Bank of New York Long-Term Funding Agreements Maturing in Less than Four Years              
Future Minimum Sublease Rentals, Sale Leaseback Transactions, Fiscal Year Maturity [Abstract]              
Outstanding balance at end of year   1,244.0 58.0        
Issued during the Year   324.0 58.0        
Repaid during the year   0.0        
Federal Home Loan Bank of New York Long-Term Funding Agreements Maturing in Less than Five Years              
Future Minimum Sublease Rentals, Sale Leaseback Transactions, Fiscal Year Maturity [Abstract]              
Outstanding balance at end of year   377.0 862.0        
Issued during the Year   303.0 862.0        
Repaid during the year   0.0        
Federal Home Loan Bank of New York Long-Term Funding Agreements Maturing in Greater than Five Years              
Future Minimum Sublease Rentals, Sale Leaseback Transactions, Fiscal Year Maturity [Abstract]              
Outstanding balance at end of year   879.0 818.0        
Issued during the Year   135.0 818.0        
Repaid during the year   0.0        
Federal Home Loan Bank of New York Long-Term Funding Agreements              
Future Minimum Sublease Rentals, Sale Leaseback Transactions, Fiscal Year Maturity [Abstract]              
Outstanding balance at end of year   2,500.0 1,738.0        
Issued during the Year   762.0 1,738.0        
Repaid during the year   0.0 0.0        
Sivolella Litigation              
Loss Contingencies [Line Items]              
Number of funds involved in lawsuit | fund           12  
Brach Family Foundation Litigation              
Loss Contingencies [Line Items]              
Current face amount per policy | $ / policy 1            
Issue age 70 years            
SCB LLC | Line of Credit | Financial Institutions              
Loss Contingencies [Line Items]              
Total amount of guarantees maintained   $ 375.0          
Number of guarantees maintained | line_of_credit   3          
AXA              
Future Minimum Sublease Rentals, Sale Leaseback Transactions, Fiscal Year Maturity [Abstract]              
Severance costs   $ 29.0 21.0 3.0      
Pre tax real estate charge       25.0      
Loss Contingencies [Line Items]              
Commitments by the Company to provide equity financing   715.0          
Letters of credit   18.0          
Commitments under existing mortgage loan agreements   636.0          
AXA | Affiliated Entity              
Loss Contingencies [Line Items]              
Commitments by the Company to provide equity financing   193.0          
AXA | Assets of Consolidated VIEs/VOEs              
Loss Contingencies [Line Items]              
Commitments by the Company to provide equity financing   22.0          
AXA | Severance              
Restructuring Reserve [Roll Forward]              
Balance, beginning of year   22.0 11.0        
Additions   17.0 20.0        
Cash payments   (14.0) (9.0)        
Other reductions   (2.0) 0.0        
Balance, end of Year   23.0 22.0 11.0      
AXA | Leases              
Restructuring Reserve [Roll Forward]              
Balance, beginning of year   170.0 190.0        
Additions   29.0 12.0        
Deferred rent   10.0 5.0        
Cash payments   (48.0) (42.0)        
Interest accretion   4.0 5.0        
Balance, end of Year   165.0 $ 170.0 $ 190.0      
Alliance Bernstein | Private real estate investment funds              
Loss Contingencies [Line Items]              
Commitment to invest             $ 25.0
Commitment to invest, funded   22.0          
Alliance Bernstein | Real Estate Funds II              
Loss Contingencies [Line Items]              
Commitment to invest             $ 28.0
Commitment to invest, funded   10.0          
Alliance Bernstein | Oil And Gas Fund              
Loss Contingencies [Line Items]              
Commitment to invest         $ 8.0    
Commitment to invest, funded   6.0          
Commitment to invest, period         3 years    
Alliance Bernstein | Commercial Banks | Limited Partner              
Loss Contingencies [Line Items]              
Liability for commitments   $ 0.0          
Alliance Bernstein | Line of Credit | Financial Institutions              
Loss Contingencies [Line Items]              
Number of guarantees maintained | line_of_credit   3          
SCBL | Line of Credit | Financial Institutions              
Loss Contingencies [Line Items]              
Number of guarantees maintained | line_of_credit   3          
SCBL | Line of Credit | Commercial Banks              
Loss Contingencies [Line Items]              
Total amount of guarantees maintained   $ 410.0