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FAIR VALUE DISCLOSURES - SCHEDULES OF ASSETS AND LIABILITIES MEASURED ON RECURRING BASIS (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale $ 36,515 $ 32,683
Trading securities, at fair value 12,628 9,134
Level 3    
Investment Fair Value Disclosure [Abstract]    
Other invested assets: 2  
Fair Value, Measurements, Recurring    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 36,358 32,570
Other equity investments 14 8
Trading securities, at fair value 12,628 9,134
Other invested assets: 4,023 1,218
Cash equivalents 2,360 1,529
Segregated securities 825 946
GMIB reinsurance contracts asset 10,488 10,314
Separate Accounts’ assets 122,315 111,216
Total Assets 189,011 166,935
Liabilities, Fair Value Disclosure [Abstract]    
Total Liabilities 6,565 6,474
Fair Value, Measurements, Recurring | Public Corporate    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 14,345 13,012
Fair Value, Measurements, Recurring | Private Corporate    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 7,137 7,040
Fair Value, Measurements, Recurring | U.S. Treasury, government and agency    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 13,135 10,336
Fair Value, Measurements, Recurring | States and political subdivisions    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 481 493
Fair Value, Measurements, Recurring | Foreign governments    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 409 390
Fair Value, Measurements, Recurring | Commercial mortgage-backed    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 0 371
Fair Value, Measurements, Recurring | Residential Mortgage- backed    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 251 314
Fair Value, Measurements, Recurring | Asset- backed    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 96 60
Fair Value, Measurements, Recurring | Redeemable preferred stock    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 504 554
Fair Value, Measurements, Recurring | Short-term investments    
Investment Fair Value Disclosure [Abstract]    
Other invested assets: 768 574
Fair Value, Measurements, Recurring | Assets of consolidated VIEs/VOEs    
Investment Fair Value Disclosure [Abstract]    
Other invested assets: 1,302 593
Fair Value, Measurements, Recurring | Swaps    
Investment Fair Value Disclosure [Abstract]    
Other invested assets: 15 (925)
Fair Value, Measurements, Recurring | Credit default swaps    
Investment Fair Value Disclosure [Abstract]    
Other invested assets: 33 5
Fair Value, Measurements, Recurring | Futures    
Investment Fair Value Disclosure [Abstract]    
Other invested assets: (2) 0
Fair Value, Measurements, Recurring | Options    
Investment Fair Value Disclosure [Abstract]    
Other invested assets: 1,907 960
Fair Value, Measurements, Recurring | Floors    
Investment Fair Value Disclosure [Abstract]    
Other invested assets: 0 11
Fair Value, Measurements, Recurring | GMxB derivative features’ liability    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities 4,164 5,319
Fair Value, Measurements, Recurring | SCS, SIO, MSO and IUL indexed features’ liability    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities 1,698 887
Fair Value, Measurements, Recurring | Liabilities of consolidated VIEs/VOEs    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities 692 250
Fair Value, Measurements, Recurring | Contingent payment arrangements    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities 11 18
Fair Value, Measurements, Recurring | Level 1    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 180 218
Other equity investments 13 3
Trading securities, at fair value 467 478
Other invested assets: 1,058 342
Cash equivalents 2,360 1,529
Segregated securities 0 0
GMIB reinsurance contracts asset 0 0
Separate Accounts’ assets 118,983 108,085
Total Assets 123,061 110,655
Liabilities, Fair Value Disclosure [Abstract]    
Total Liabilities 670 248
Fair Value, Measurements, Recurring | Level 1 | Public Corporate    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 0 0
Fair Value, Measurements, Recurring | Level 1 | Private Corporate    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 0 0
Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury, government and agency    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 0 0
Fair Value, Measurements, Recurring | Level 1 | States and political subdivisions    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 0 0
Fair Value, Measurements, Recurring | Level 1 | Foreign governments    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 0 0
Fair Value, Measurements, Recurring | Level 1 | Commercial mortgage-backed    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 0 0
Fair Value, Measurements, Recurring | Level 1 | Residential Mortgage- backed    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 0 0
Fair Value, Measurements, Recurring | Level 1 | Asset- backed    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 0 0
Fair Value, Measurements, Recurring | Level 1 | Redeemable preferred stock    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 180 218
Fair Value, Measurements, Recurring | Level 1 | Short-term investments    
Investment Fair Value Disclosure [Abstract]    
Other invested assets: 0 0
Fair Value, Measurements, Recurring | Level 1 | Assets of consolidated VIEs/VOEs    
Investment Fair Value Disclosure [Abstract]    
Other invested assets: 1,060 342
Fair Value, Measurements, Recurring | Level 1 | Swaps    
Investment Fair Value Disclosure [Abstract]    
Other invested assets: 0 0
Fair Value, Measurements, Recurring | Level 1 | Credit default swaps    
Investment Fair Value Disclosure [Abstract]    
Other invested assets: 0 0
Fair Value, Measurements, Recurring | Level 1 | Futures    
Investment Fair Value Disclosure [Abstract]    
Other invested assets: (2) 0
Fair Value, Measurements, Recurring | Level 1 | Options    
Investment Fair Value Disclosure [Abstract]    
Other invested assets: 0 0
Fair Value, Measurements, Recurring | Level 1 | Floors    
Investment Fair Value Disclosure [Abstract]    
Other invested assets: 0 0
Fair Value, Measurements, Recurring | Level 1 | GMxB derivative features’ liability    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities 0 0
Fair Value, Measurements, Recurring | Level 1 | SCS, SIO, MSO and IUL indexed features’ liability    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities 0 0
Fair Value, Measurements, Recurring | Level 1 | Liabilities of consolidated VIEs/VOEs    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities 670 248
Fair Value, Measurements, Recurring | Level 1 | Contingent payment arrangements    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities 0 0
Fair Value, Measurements, Recurring | Level 2    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 34,991 31,091
Other equity investments 0 0
Trading securities, at fair value 12,161 8,656
Other invested assets: 2,938 830
Cash equivalents 0 0
Segregated securities 825 946
GMIB reinsurance contracts asset 0 0
Separate Accounts’ assets 2,983 2,818
Total Assets 53,898 44,341
Liabilities, Fair Value Disclosure [Abstract]    
Total Liabilities 1,720 889
Fair Value, Measurements, Recurring | Level 2 | Public Corporate    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 14,298 12,984
Fair Value, Measurements, Recurring | Level 2 | Private Corporate    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 6,045 6,223
Fair Value, Measurements, Recurring | Level 2 | U.S. Treasury, government and agency    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 13,135 10,336
Fair Value, Measurements, Recurring | Level 2 | States and political subdivisions    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 441 451
Fair Value, Measurements, Recurring | Level 2 | Foreign governments    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 409 390
Fair Value, Measurements, Recurring | Level 2 | Commercial mortgage-backed    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 0 22
Fair Value, Measurements, Recurring | Level 2 | Residential Mortgage- backed    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 251 314
Fair Value, Measurements, Recurring | Level 2 | Asset- backed    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 88 36
Fair Value, Measurements, Recurring | Level 2 | Redeemable preferred stock    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 324 335
Fair Value, Measurements, Recurring | Level 2 | Short-term investments    
Investment Fair Value Disclosure [Abstract]    
Other invested assets: 768 574
Fair Value, Measurements, Recurring | Level 2 | Assets of consolidated VIEs/VOEs    
Investment Fair Value Disclosure [Abstract]    
Other invested assets: 215 205
Fair Value, Measurements, Recurring | Level 2 | Swaps    
Investment Fair Value Disclosure [Abstract]    
Other invested assets: 15 (925)
Fair Value, Measurements, Recurring | Level 2 | Credit default swaps    
Investment Fair Value Disclosure [Abstract]    
Other invested assets: 33 5
Fair Value, Measurements, Recurring | Level 2 | Futures    
Investment Fair Value Disclosure [Abstract]    
Other invested assets: 0 0
Fair Value, Measurements, Recurring | Level 2 | Options    
Investment Fair Value Disclosure [Abstract]    
Other invested assets: 1,907 960
Fair Value, Measurements, Recurring | Level 2 | Floors    
Investment Fair Value Disclosure [Abstract]    
Other invested assets: 0 11
Fair Value, Measurements, Recurring | Level 2 | GMxB derivative features’ liability    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities 0 0
Fair Value, Measurements, Recurring | Level 2 | SCS, SIO, MSO and IUL indexed features’ liability    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities 1,698 887
Fair Value, Measurements, Recurring | Level 2 | Liabilities of consolidated VIEs/VOEs    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities 22 2
Fair Value, Measurements, Recurring | Level 2 | Contingent payment arrangements    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities 0 0
Fair Value, Measurements, Recurring | Level 3    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 1,187 1,261
Other equity investments 1 5
Trading securities, at fair value 0 0
Other invested assets: 27 46
Cash equivalents 0 0
Segregated securities 0 0
GMIB reinsurance contracts asset 10,488 10,314
Separate Accounts’ assets 349 313
Total Assets 12,052 11,939
Liabilities, Fair Value Disclosure [Abstract]    
Total Liabilities 4,175 5,337
Fair Value, Measurements, Recurring | Level 3 | Public Corporate    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 47 28
Fair Value, Measurements, Recurring | Level 3 | Private Corporate    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 1,092 817
Fair Value, Measurements, Recurring | Level 3 | U.S. Treasury, government and agency    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 0 0
Fair Value, Measurements, Recurring | Level 3 | States and political subdivisions    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 40 42
Fair Value, Measurements, Recurring | Level 3 | Foreign governments    
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 0 349
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 8 24
Fair Value, Measurements, Recurring | Level 3 | Redeemable preferred stock    
Investment Fair Value Disclosure [Abstract]    
Fixed maturities, available-for-sale 0 1
Fair Value, Measurements, Recurring | Level 3 | Short-term investments    
Investment Fair Value Disclosure [Abstract]    
Other invested assets: 0 0
Fair Value, Measurements, Recurring | Level 3 | Assets of consolidated VIEs/VOEs    
Investment Fair Value Disclosure [Abstract]    
Other invested assets: 27 46
Fair Value, Measurements, Recurring | Level 3 | Swaps    
Investment Fair Value Disclosure [Abstract]    
Other invested assets: 0 0
Fair Value, Measurements, Recurring | Level 3 | Credit default swaps    
Investment Fair Value Disclosure [Abstract]    
Other invested assets: 0 0
Fair Value, Measurements, Recurring | Level 3 | Futures    
Investment Fair Value Disclosure [Abstract]    
Other invested assets: 0 0
Fair Value, Measurements, Recurring | Level 3 | Options    
Investment Fair Value Disclosure [Abstract]    
Other invested assets: 0 0
Fair Value, Measurements, Recurring | Level 3 | Floors    
Investment Fair Value Disclosure [Abstract]    
Other invested assets: 0 0
Fair Value, Measurements, Recurring | Level 3 | GMxB derivative features’ liability    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities 4,164 5,319
Fair Value, Measurements, Recurring | Level 3 | SCS, SIO, MSO and IUL indexed features’ liability    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities 0 0
Fair Value, Measurements, Recurring | Level 3 | Liabilities of consolidated VIEs/VOEs    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities 0 0
Fair Value, Measurements, Recurring | Level 3 | Contingent payment arrangements    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities $ 11 $ 18