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Fair Value of Assets and Liabilities (Details 3) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward        
Balance at beginning of period $ 903 $ 1,003 $ 735 $ 973
Total gains (losses) included in: net income 9 (4) 20 (18)
Total gains (losses) included in: OCI 1 14 9 17
Transfers into Level 3 33 31 60 60
Transfers out of Level 3 (127) (76) (149) (97)
Purchases 128 87 288 161
Sales (98) (2) (101) (25)
Issues 0 0 0 0
Settlements (7) (34) (20) (52)
Balance at end of period 842 1,019 842 1,019
Fair Value Liabilities Measured on Recurring Basis Unobservable Input Reconciliation Calculation        
Balance at the beginning of the period (286) (313) (290) (299)
Total gains (losses) included in: net income 0 (7) (3) 8
Total gains (losses) included in: OCI 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Issues 0 0 (1) (1)
Settlements 1 2 3 4
Balance at the end of the period (285) (304) (285) (304)
Fair value assets and liabilities measured on recurring basis, gain (loss) included in earnings        
Total realized and unrealized gains (losses) included in net income, recurring Level 3 assets and liabilities 9 3 23 (26)
Free-standing derivatives 1 1 1 1
Free-standing derivatives, liabilities   8   8
Realized capital gains and losses        
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward        
Total gains (losses) included in: net income 5 (9) 7 (25)
Fair value assets and liabilities measured on recurring basis, gain (loss) included in earnings        
Change in unrealized gain (loss) (1) (9)   (38)
Gain reclassified from AOCI into income (net investment income)        
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward        
Total gains (losses) included in: net income 4 5 14 7
Fair value assets and liabilities measured on recurring basis, gain (loss) included in earnings        
Change in unrealized gain (loss) 4 6 14 8
Interest credited to contractholder funds        
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward        
Total gains (losses) included in: net income (1) (7) (6) (6)
Fair value assets and liabilities measured on recurring basis, gain (loss) included in earnings        
Change in unrealized gain (loss) (1) (7) (6) (6)
Life and annuity contract benefits        
Fair value assets and liabilities measured on recurring basis, gain (loss) included in earnings        
Change in unrealized gain (loss) 1 14 8 (2)
Fixed income securities        
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward        
Balance at beginning of period 699 885 558 846
Total gains (losses) included in: net income 4 3 5 14
Total gains (losses) included in: OCI (2) 13 6 9
Transfers into Level 3 33 31 60 60
Transfers out of Level 3 (127) (76) (146) (97)
Purchases 121 87 260 152
Sales (46) (2) (48) (25)
Issues 0 0 0 0
Settlements (7) (34) (20) (52)
Balance at end of period 675 907 675 907
U.S. government and agencies        
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward        
Balance at beginning of period   4   5
Total gains (losses) included in: net income   0   0
Total gains (losses) included in: OCI   0   0
Transfers into Level 3   0   0
Transfers out of Level 3   (4)   (4)
Purchases   0   0
Sales   0   0
Issues   0   0
Settlements   0   (1)
Balance at end of period   0   0
Municipal        
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward        
Balance at beginning of period 124 146 125 161
Total gains (losses) included in: net income (2) 0 (1) 10
Total gains (losses) included in: OCI 5 3 6 (5)
Transfers into Level 3 0 6 0 6
Transfers out of Level 3 0 0 (1) 0
Purchases 5 0 5 0
Sales (18) (6) (20) (22)
Issues 0 0 0 0
Settlements 0 0 0 (1)
Balance at end of period 114 149 114 149
Corporate - public        
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward        
Balance at beginning of period 60 63 78 46
Total gains (losses) included in: net income 0 0 0 0
Total gains (losses) included in: OCI 0 0 0 1
Transfers into Level 3 0 0 0 25
Transfers out of Level 3 0 0 (16) (7)
Purchases (1) 7 (1) 7
Sales 1 4 1 4
Issues 0 0 0 0
Settlements 0 0 (2) (2)
Balance at end of period 60 74 60 74
Corporate - privately placed        
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward        
Balance at beginning of period 263 549 263 502
Total gains (losses) included in: net income 6 3 6 4
Total gains (losses) included in: OCI (7) 8 (2) 13
Transfers into Level 3 30 16 30 16
Transfers out of Level 3 0 (69) 0 (83)
Purchases 4 80 4 143
Sales (29) 0 (29) 0
Issues 0 0 0 0
Settlements (1) (2) (6) (10)
Balance at end of period 266 585 266 585
ABS - CDO        
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward        
Balance at beginning of period 147 58 27 61
Total gains (losses) included in: net income 0 0 0 0
Total gains (losses) included in: OCI 0 3 2 2
Transfers into Level 3 3 6 30 10
Transfers out of Level 3 (122) (3) (122) (3)
Purchases 65 0 160 0
Sales 0 0 0 (2)
Issues 0 0 0 0
Settlements (2) (31) (6) (35)
Balance at end of period 91 33 91 33
ABS - consumer and other        
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward        
Balance at beginning of period 80 44 42 50
Total gains (losses) included in: net income 0 0 0 0
Total gains (losses) included in: OCI 0 (1) 0 (2)
Transfers into Level 3 0 3 0 3
Transfers out of Level 3 (5) 0 (7) 0
Purchases 48 0 89 0
Sales 0 0 0 (5)
Issues 0 0 0 0
Settlements (3) (1) (4) (1)
Balance at end of period 120 45 120 45
Residential mortgage-backed securities (“RMBS”)        
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward        
Balance at beginning of period   1 1 1
Total gains (losses) included in: net income   0 0 0
Total gains (losses) included in: OCI   0 0 0
Transfers into Level 3   0 0 0
Transfers out of Level 3   0 0 0
Purchases   0 0 0
Sales   0 0 0
Issues   0 0 0
Settlements   0 (1) 0
Balance at end of period 0 1 0 1
Commercial mortgage-backed securities (“CMBS”)        
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward        
Balance at beginning of period 25 20 22 20
Total gains (losses) included in: net income 0 0 0 0
Total gains (losses) included in: OCI 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Purchases 0 0 3 2
Sales 0 0 0 0
Issues 0 0 0 0
Settlements (1) 0 (1) (2)
Balance at end of period 24 20 24 20
Equity securities        
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward        
Balance at beginning of period 170 125 163 133
Total gains (losses) included in: net income 3 (8) 13 (32)
Total gains (losses) included in: OCI 3 1 3 8
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 (3) 0
Purchases 2 0 3 9
Sales (12) 0 (13) 0
Issues 0 0 0 0
Settlements 0 0 0 0
Balance at end of period 166 118 166 118
Short-term investments        
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward        
Balance at beginning of period 35   15  
Total gains (losses) included in: net income 0   0  
Total gains (losses) included in: OCI 0   0  
Transfers into Level 3 0   0  
Transfers out of Level 3 0   0  
Purchases 5   25  
Sales (40)   (40)  
Issues 0   0  
Settlements 0   0  
Balance at end of period 0   0  
Free-standing derivatives, net        
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward        
Balance at beginning of period (1) (8) (2) (7)
Total gains (losses) included in: net income 2 1 3 0
Total gains (losses) included in: OCI 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Issues 0 0 0 0
Settlements 0 0 0 0
Balance at end of period 1 (7) 1 (7)
Other assets        
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward        
Balance at beginning of period   1 1 1
Total gains (losses) included in: net income   0 (1) 0
Total gains (losses) included in: OCI   0 0 0
Transfers into Level 3   0 0 0
Transfers out of Level 3   0 0 0
Purchases   0 0 0
Sales   0 0 0
Issues   0 0 0
Settlements   0 0 0
Balance at end of period 0 1 0 1
Derivatives embedded in life and annuity contracts        
Fair Value Liabilities Measured on Recurring Basis Unobservable Input Reconciliation Calculation        
Balance at the beginning of the period (286) (313) (290) (299)
Total gains (losses) included in: net income 0 (7) (3) 8
Total gains (losses) included in: OCI 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Issues 0 0 (1) (1)
Settlements 1 2 3 4
Balance at the end of the period $ (285) $ (304) $ (285) $ (304)