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Fair Value of Assets and Liabilities - Rollforward of level 3 assets and liabilities held at fair value on a recurring basis during the period (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward        
Balance at beginning of period $ 777 $ 842 $ 837 $ 735
Total gains (losses) included in: net income 9 3 24 23
Total gains (losses) included in: OCI (2) 4 (5) 13
Transfers into Level 3 44 0 78 60
Transfers out of Level 3 (62) (173) (203) (322)
Purchases 90 83 295 371
Sales (29) (5) (161) (106)
Issues 0 0 0 0
Settlements (31) (13) (69) (33)
Balance at end of period 796 741 796 741
Fair Value Liabilities Measured on Recurring Basis Unobservable Input Reconciliation Calculation        
Balance at the beginning of the period (260) (285) (286) (290)
Total gains (losses) included in: net income (7) (9) 17 (6)
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 4 5
Balance at the end of the period (266) (292) (266) (292)
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 2 (6) 41 17
Free-standing derivatives 1 1 1 1
Realized capital gains and losses        
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward        
Total gains (losses) included in: net income 9   24 7
Fair value assets and liabilities measured on recurring basis, gain (loss) included in earnings        
Change in unrealized gain (loss) 8 (3) 23 (3)
(Loss) 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   3   17
Fair value assets and liabilities measured on recurring basis, gain (loss) included in earnings        
Change in unrealized gain (loss)   3   17
Interest credited to contractholder funds        
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward        
Total gains (losses) included in: net income   (5) 10 (11)
Fair value assets and liabilities measured on recurring basis, gain (loss) included in earnings        
Change in unrealized gain (loss) (9) (5) 10 (11)
Life contract benefits        
Fair value assets and liabilities measured on recurring basis, gain (loss) included in earnings        
Change in unrealized gain (loss) 2 (4) 7 4
Municipal        
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward        
Balance at beginning of period 106 114 101 125
Total gains (losses) included in: net income 0 0 1 (1)
Total gains (losses) included in: OCI (1) 0 (2) 6
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 (9) (4) (11) (5)
Purchases 0 1 10 6
Sales (6) (3) (8) (23)
Issues 0 0 0 0
Settlements (1) (1) (2) (1)
Balance at end of period 89 107 89 107
Corporate - public        
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward        
Balance at beginning of period 76 60 108 78
Total gains (losses) included in: net income 0 0 0 0
Total gains (losses) included in: OCI (1) 0 (3) 0
Transfers into Level 3 12 0 16 0
Transfers out of Level 3 (4) (4) (9) (20)
Purchases 10 51 10 50
Sales (1) (1) (27) 0
Issues 0 0 0 0
Settlements 0 (2) (3) (4)
Balance at end of period 92 104 92 104
Corporate - privately placed        
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward        
Balance at beginning of period 195 266 224 263
Total gains (losses) included in: net income 1 1 (1) 7
Total gains (losses) included in: OCI (1) 2 (2) 0
Transfers into Level 3 0 0 20 30
Transfers out of Level 3 (20) (34) (49) (34)
Purchases 6 18 21 22
Sales (2) (1) (5) (30)
Issues 0 0 0 0
Settlements (12) (2) (41) (8)
Balance at end of period 167 250 167 250
ABS - CDO        
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward        
Balance at beginning of period 9 91 99 27
Total gains (losses) included in: net income 0 0 0 0
Total gains (losses) included in: OCI 1 1 1 3
Transfers into Level 3 20 0 20 30
Transfers out of Level 3 0 (68) (89) (190)
Purchases 0 0 0 160
Sales 0 0 0 0
Issues 0 0 0 0
Settlements (1) (5) (2) (11)
Balance at end of period 29 19 29 19
ABS - consumer and other        
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward        
Balance at beginning of period 73 120 48 42
Total gains (losses) included in: net income 0 0 0 0
Total gains (losses) included in: OCI 0 0 1 0
Transfers into Level 3 12 0 22 0
Transfers out of Level 3 (29) (62) (45) (69)
Purchases 33 10 108 99
Sales (20) 0 (62) 0
Issues 0 0 0 0
Settlements (17) (2) (20) (6)
Balance at end of period 52 66 52 66
Residential mortgage-backed securities (“RMBS”)        
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward        
Balance at beginning of period       1
Total gains (losses) included in: net income       0
Total gains (losses) included in: OCI       0
Transfers into Level 3       0
Transfers out of Level 3       0
Purchases       0
Sales       0
Issues       0
Settlements       (1)
Balance at end of period   0   0
Commercial mortgage-backed securities (“CMBS”)        
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward        
Balance at beginning of period 26 24 26 22
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 3 1 6
Sales 0 0 0 0
Issues 0 0 0 0
Settlements 0 (1) (1) (2)
Balance at end of period 26 26 26 26
Fixed income securities        
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward        
Balance at beginning of period 485 675 606 558
Total gains (losses) included in: net income 1 1 0 6
Total gains (losses) included in: OCI (2) 3 (5) 9
Transfers into Level 3 44 0 78 60
Transfers out of Level 3 (62) (172) (203) (318)
Purchases 49 83 150 343
Sales (29) (5) (102) (53)
Issues 0 0 0 0
Settlements (31) (13) (69) (33)
Balance at end of period 455 572 455 572
Equity securities        
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward        
Balance at beginning of period 291 166 210 163
Total gains (losses) included in: net income 8 2 24 15
Total gains (losses) included in: OCI 0 1 0 4
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 (1) 0 (4)
Purchases 21 0 100 3
Sales 0 0 (14) (13)
Issues 0 0 0 0
Settlements 0 0 0 0
Balance at end of period 320 168 320 168
Short-term investments        
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward        
Balance at beginning of period 0   20 15
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 20   45 25
Sales 0   (45) (40)
Issues 0   0 0
Settlements 0   0 0
Balance at end of period 20 0 20 0
Free-standing derivatives, net        
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward        
Balance at beginning of period 1 1 1 (2)
Total gains (losses) included in: net income 0 0 0 3
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 1 1 1
Other assets        
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward        
Balance at beginning of period       1
Total gains (losses) included in: net income       (1)
Total gains (losses) included in: OCI       0
Transfers into Level 3       0
Transfers out of Level 3       0
Purchases       0
Sales       0
Issues       0
Settlements       0
Balance at end of period   0   0
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 (260) (285) (286) (290)
Total gains (losses) included in: net income (7) (9) 17 (6)
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 4 5
Balance at the end of the period $ (266) $ (292) $ (266) $ (292)