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FAIR VALUE DISCLOSURES - TEXTUAL (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Mar. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Quantitative Disclosure [Line Items]        
Fixed maturities, available-for-sale     $ 36,515,000,000  
Fair value freestanding contract $ 2,481,000,000   $ 1,953,000,000  
Freestanding contract invested assets (as a percent) 66.30%   48.50%  
Fair value adjustments on GMIB asset $ 17,000,000   $ 69,000,000  
Transfers out of Level 3 28,000,000 $ 6,000,000    
Transfers into level 3 $ 65,000,000 $ 13,000,000    
Transfers out of Levels 2 and 3 to total equity (as a percent) 0.60% 0.10%    
Investments which the underlying quantitative inputs are not developed by the Company and are not readily available     $ 395,000,000 $ 990,000,000
Percentage of total assets classified as Level 3     25.30% 46.70%
Percentage of assets measured at fair value on a recurring basis     0.20% 0.50%
Corporate | Private Available For Sale Corporate Securities | Matrix pricing model        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Quantitative Disclosure [Line Items]        
Fair value of privately placed, available-for-sale corporate debt securities classified as Level 3     $ 842,000,000 $ 788,000,000
Percentage of Level 3 securities in the corporate fixed maturities asset class 68.40%   73.90%  
Asset-backed | Matrix pricing model        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Quantitative Disclosure [Line Items]        
Percentage of Level 3 securities in the corporate fixed maturities asset class    
Separate Accounts Assets | Asset-backed        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Quantitative Disclosure [Line Items]        
Fair value of privately placed, available-for-sale corporate debt securities classified as Level 3     $ 8,000,000 8,000,000
Separate Accounts Assets | Collateralized Mortgage Backed Securities        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Quantitative Disclosure [Line Items]        
Fair value of privately placed, available-for-sale corporate debt securities classified as Level 3     14,000,000 13,000,000
Separate Accounts Assets | Private Real Estate Fund | Third party appraisal        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Quantitative Disclosure [Line Items]        
Fair value of privately placed, available-for-sale corporate debt securities classified as Level 3     326,000,000 339,000,000
Separate Accounts Assets | Mortgages | Third party appraisal        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Quantitative Disclosure [Line Items]        
Fair value of privately placed, available-for-sale corporate debt securities classified as Level 3     $ 1,000,000 1,000,000
Level 1        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Quantitative Disclosure [Line Items]        
Assets measured at fair value on recurring basis (as a percent) 67.30%   69.20%  
Level 2        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Quantitative Disclosure [Line Items]        
Assets measured at fair value on recurring basis (as a percent) 31.60%   29.90%  
Mortgages and asset-backed securities owned $ 217,000,000   $ 257,000,000  
Level 3        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Quantitative Disclosure [Line Items]        
Assets measured at fair value on recurring basis (as a percent) 1.20%   0.90%  
Mortgages and asset-backed securities owned $ 282,000,000   $ 8,000,000  
Fair value disclosures broker priced 94,000,000   97,000,000  
Level 3 | Corporate | Matrix pricing model        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Quantitative Disclosure [Line Items]        
Fair value of privately placed, available-for-sale corporate debt securities classified as Level 3 31,000,000   53,000,000  
Level 3 | Separate Accounts Assets | Third party appraisal        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Quantitative Disclosure [Line Items]        
Fair value of privately placed, available-for-sale corporate debt securities classified as Level 3 339,000,000   326,000,000  
Public Fixed Maturities        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Quantitative Disclosure [Line Items]        
Fixed maturities, available-for-sale $ 32,518,000,000   $ 28,826,000,000  
Available-for-sale fixed maturity assets measured at fair value on recurring basis (as a percent) 17.70%   16.20%  
Private Fixed Maturities        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Quantitative Disclosure [Line Items]        
Fixed maturities, available-for-sale $ 7,876,000,000   $ 7,532,000,000  
Available-for-sale fixed maturity assets measured at fair value on recurring basis (as a percent) 4.30%   4.20%  
Alliance Bernstein | Level 3 | AB 2016 Acquisition        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Quantitative Disclosure [Line Items]        
Acquisition-related contingent consideration liability     $ 11,000,000 $ 11,000,000
Long-term revenue growth rate | Alliance Bernstein | Level 3 | AB 2016 Acquisition        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Quantitative Disclosure [Line Items]        
Acquisition-related contingent consideration liability, measurement input     0.310 0.310
Discount rate | Alliance Bernstein | Level 3 | AB 2016 Acquisition | Minimum        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Quantitative Disclosure [Line Items]        
Acquisition-related contingent consideration liability, measurement input     0.014 0.014
Discount rate | Alliance Bernstein | Level 3 | AB 2016 Acquisition | Maximum        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Quantitative Disclosure [Line Items]        
Acquisition-related contingent consideration liability, measurement input     0.023 0.023