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INSURANCE LIABILITIES - Separate Account Investments, Hedging Programs and Variable and Interest-Sensitive Live Insurance Policies (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]      
Fair Value of Assets $ 62,286 $ 57,848  
Liabilities for Guarantees on Long-Duration Contracts [Line Items]      
Opening Balance 7,035 6,877 $ 6,427
Paid guarantee benefits (505) (638) (402)
Other changes in reserves 2,352 796 852
Closing Balance 8,882 7,035 6,877
GMDB      
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]      
Fair Value of Assets 94,672 86,890  
Price Risk Fair Value Hedge Derivative On Balance Sheet [Abstract]      
Total account value of hedged variable annuity contracts 55,771    
Net amount at risk of hedged variable annuity contracts 6,893    
Liabilities for Guarantees on Long-Duration Contracts [Line Items]      
Opening Balance 3,165 2,991 1,725
Paid guarantee benefits (354) (357) (313)
Other changes in reserves 1,269 531 1,579
Closing Balance 4,080 3,165 2,991
GMIB      
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]      
Fair Value of Assets 62,286    
Price Risk Fair Value Hedge Derivative On Balance Sheet [Abstract]      
Total account value of hedged variable annuity contracts 42,077    
Net amount at risk of hedged variable annuity contracts 2,613    
Liabilities for Guarantees on Long-Duration Contracts [Line Items]      
Opening Balance 3,870 3,886 4,702
Paid guarantee benefits (151) (281) (89)
Other changes in reserves 1,083 265 (727)
Closing Balance 4,802 3,870 3,886
Equity | GMDB      
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]      
Fair Value of Assets 78,069 69,625  
Equity | GMIB      
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]      
Fair Value of Assets 50,429 45,931  
Fixed income | GMDB      
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]      
Fair Value of Assets 2,234 2,483  
Fixed income | GMIB      
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]      
Fair Value of Assets 1,568 1,671  
Balanced | GMDB      
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]      
Fair Value of Assets 14,084 14,434  
Balanced | GMIB      
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]      
Fair Value of Assets 10,165 10,097  
Other | GMDB      
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]      
Fair Value of Assets 285 348  
Other | GMIB      
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]      
Fair Value of Assets 124 149  
Direct Liabilities For Guarantees      
Liabilities for Guarantees on Long-Duration Contracts [Line Items]      
Opening Balance 1,197 1,144 979
Paid guarantee benefits (24)    
Other changes in reserves (487) 53 165
Closing Balance 686 1,197 1,144
Ceded Liabilities For Guarantees      
Liabilities for Guarantees on Long-Duration Contracts [Line Items]      
Opening Balance (609) (510) (526)
Paid guarantee benefits 0    
Other changes in reserves (55) (99) 16
Closing Balance (664) (609) (510)
Net Liabilities For Guarantees      
Liabilities for Guarantees on Long-Duration Contracts [Line Items]      
Opening Balance 588 634 453
Paid guarantee benefits (24)    
Other changes in reserves (542) (46) 181
Closing Balance $ 22 $ 588 $ 634