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FAIR VALUE DISCLOSURES (FAIR VALUE MEASUREMENTS) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale $ 33,510 $ 32,683
Trading securities 10,969 9,134
Fair Value, Measurements, Recurring    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 33,378 32,570
Other equity investments 8 8
Trading securities 10,969 9,134
Other invested assets 3,302 1,178
Cash equivalents 2,175 1,529
Segregated securities 1,078 946
GMIB reinsurance contract asset 11,290 10,309
Separate Accounts’ assets 116,625 111,216
Total Assets 178,825 166,890
Liabilities, Fair Value Disclosure [Abstract]    
Contingent payment arrangements 17 18
Total Liabilities 1,717 1,319
Fair Value, Measurements, Recurring | Corporate    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 13,230 13,012
Fair Value, Measurements, Recurring | Private corporate    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 7,287 7,040
Fair Value, Measurements, Recurring | U.S. Treasury, government and agency    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 10,849 10,336
Fair Value, Measurements, Recurring | State and Political Sub- divisions    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 484 493
Fair Value, Measurements, Recurring | Foreign Govts    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 367 390
Fair Value, Measurements, Recurring | Commercial Mortgage- backed    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 303 371
Fair Value, Measurements, Recurring | Residential Mortgage- backed    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 281 314
Fair Value, Measurements, Recurring | Asset- backed    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 40 60
Fair Value, Measurements, Recurring | Redeemable Preferred Stock    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 537 554
Fair Value, Measurements, Recurring | Short-term investments    
Investment Fair Value Disclosure [Abstract]    
Other invested assets 1,261 574
Fair Value, Measurements, Recurring | Assets of Consolidated VIEs/VOEs [Member]    
Investment Fair Value Disclosure [Abstract]    
Other invested assets 661 553
Fair Value, Measurements, Recurring | Swaps    
Investment Fair Value Disclosure [Abstract]    
Other invested assets 111 (925)
Fair Value, Measurements, Recurring | Credit Default Swaps    
Investment Fair Value Disclosure [Abstract]    
Other invested assets 20 5
Fair Value, Measurements, Recurring | Futures    
Investment Fair Value Disclosure [Abstract]    
Other invested assets 0  
Fair Value, Measurements, Recurring | Options    
Investment Fair Value Disclosure [Abstract]    
Other invested assets 1,249 960
Fair Value, Measurements, Recurring | Floors    
Investment Fair Value Disclosure [Abstract]    
Other invested assets 0 11
Fair Value, Measurements, Recurring | Currency Contracts    
Investment Fair Value Disclosure [Abstract]    
Other invested assets 0  
Fair Value, Measurements, Recurring | GWBL and Other Features’ liability    
Liabilities, Fair Value Disclosure [Abstract]    
Guarantees, Fair Value Disclosure 121 164
Fair Value, Measurements, Recurring | SCS, SIO, MSO and IUL indexed features’ liability    
Liabilities, Fair Value Disclosure [Abstract]    
Guarantees, Fair Value Disclosure 1,169 887
Fair Value, Measurements, Recurring | Level 1    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 214 218
Other equity investments 3 3
Trading securities 509 478
Other invested assets 539 342
Cash equivalents 2,175 1,529
Segregated securities 0  
Separate Accounts’ assets 113,282 108,085
Total Assets 116,722 110,655
Liabilities, Fair Value Disclosure [Abstract]    
Total Liabilities 407 248
Fair Value, Measurements, Recurring | Level 1 | Corporate    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 0  
Fair Value, Measurements, Recurring | Level 1 | Redeemable Preferred Stock    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 214 218
Fair Value, Measurements, Recurring | Level 1 | Assets of Consolidated VIEs/VOEs [Member]    
Investment Fair Value Disclosure [Abstract]    
Other invested assets 539 342
Fair Value, Measurements, Recurring | Level 1 | Futures    
Investment Fair Value Disclosure [Abstract]    
Other invested assets 0  
Fair Value, Measurements, Recurring | Level 2    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 31,751 31,091
Other equity investments 0 0
Trading securities 10,460 8,656
Other invested assets 2,760 830
Cash equivalents 0  
Segregated securities 1,078 946
Separate Accounts’ assets 3,010 2,818
Total Assets 49,059 44,341
Liabilities, Fair Value Disclosure [Abstract]    
Total Liabilities 1,172 889
Fair Value, Measurements, Recurring | Level 2 | Corporate    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 13,157 12,984
Fair Value, Measurements, Recurring | Level 2 | Private corporate    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 6,292 6,223
Fair Value, Measurements, Recurring | Level 2 | U.S. Treasury, government and agency    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 10,849 10,336
Fair Value, Measurements, Recurring | Level 2 | State and Political Sub- divisions    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 442 451
Fair Value, Measurements, Recurring | Level 2 | Foreign Govts    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 367 390
Fair Value, Measurements, Recurring | Level 2 | Commercial Mortgage- backed    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 13 22
Fair Value, Measurements, Recurring | Level 2 | Residential Mortgage- backed    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 281 314
Fair Value, Measurements, Recurring | Level 2 | Asset- backed    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 28 36
Fair Value, Measurements, Recurring | Level 2 | Redeemable Preferred Stock    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 322 335
Fair Value, Measurements, Recurring | Level 2 | Short-term investments    
Investment Fair Value Disclosure [Abstract]    
Other invested assets 1,261 574
Fair Value, Measurements, Recurring | Level 2 | Assets of Consolidated VIEs/VOEs [Member]    
Investment Fair Value Disclosure [Abstract]    
Other invested assets 119 205
Fair Value, Measurements, Recurring | Level 2 | Swaps    
Investment Fair Value Disclosure [Abstract]    
Other invested assets 111 (925)
Fair Value, Measurements, Recurring | Level 2 | Credit Default Swaps    
Investment Fair Value Disclosure [Abstract]    
Other invested assets 20 5
Fair Value, Measurements, Recurring | Level 2 | Futures    
Investment Fair Value Disclosure [Abstract]    
Other invested assets 0  
Fair Value, Measurements, Recurring | Level 2 | Options    
Investment Fair Value Disclosure [Abstract]    
Other invested assets 1,249 960
Fair Value, Measurements, Recurring | Level 2 | Floors    
Investment Fair Value Disclosure [Abstract]    
Other invested assets 0 11
Fair Value, Measurements, Recurring | Level 2 | Currency Contracts    
Investment Fair Value Disclosure [Abstract]    
Other invested assets 0  
Fair Value, Measurements, Recurring | Level 2 | GWBL and Other Features’ liability    
Liabilities, Fair Value Disclosure [Abstract]    
Guarantees, Fair Value Disclosure 0  
Fair Value, Measurements, Recurring | Level 2 | SCS, SIO, MSO and IUL indexed features’ liability    
Liabilities, Fair Value Disclosure [Abstract]    
Guarantees, Fair Value Disclosure 1,169 887
Fair Value, Measurements, Recurring | Level 3    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 1,413 1,261
Other equity investments 5 5
Trading securities 0  
Other invested assets 3 6
GMIB reinsurance contract asset 11,290 10,309
Separate Accounts’ assets 333 313
Total Assets 13,044 11,894
Liabilities, Fair Value Disclosure [Abstract]    
Contingent payment arrangements 17 18
Total Liabilities 138 182
Fair Value, Measurements, Recurring | Level 3 | Corporate    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 73 28
Fair Value, Measurements, Recurring | Level 3 | Private corporate    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 995 817
Fair Value, Measurements, Recurring | Level 3 | U.S. Treasury, government and agency    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 0  
Fair Value, Measurements, Recurring | Level 3 | State and Political Sub- divisions    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 42 42
Fair Value, Measurements, Recurring | Level 3 | Foreign Govts    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 0 0
Fair Value, Measurements, Recurring | Level 3 | Commercial Mortgage- backed    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 290 349
Fair Value, Measurements, Recurring | Level 3 | Residential Mortgage- backed    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 0 0
Fair Value, Measurements, Recurring | Level 3 | Asset- backed    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 12 24
Fair Value, Measurements, Recurring | Level 3 | Redeemable Preferred Stock    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 1 1
Fair Value, Measurements, Recurring | Level 3 | Assets of Consolidated VIEs/VOEs [Member]    
Investment Fair Value Disclosure [Abstract]    
Other invested assets 3 6
Fair Value, Measurements, Recurring | Level 3 | GWBL and Other Features’ liability    
Liabilities, Fair Value Disclosure [Abstract]    
Guarantees, Fair Value Disclosure 121 164
Variable Interest Entity, Primary Beneficiary | Fair Value, Measurements, Recurring    
Liabilities, Fair Value Disclosure [Abstract]    
Derivative Liability 410 250
Variable Interest Entity, Primary Beneficiary | Fair Value, Measurements, Recurring | Level 1    
Liabilities, Fair Value Disclosure [Abstract]    
Derivative Liability 407 248
Variable Interest Entity, Primary Beneficiary | Fair Value, Measurements, Recurring | Level 2    
Liabilities, Fair Value Disclosure [Abstract]    
Derivative Liability $ 3 $ 2