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Fair Value of Assets and Liabilities - Rollforward of Level 3 assets and liabilities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period $ 514 $ 720 $ 1,059
Total gains (losses) included in: net income 18 19 18
Total gains (losses) included in: OCI 9 17 (26)
Transfers into Level 3 18 49 31
Transfers out of Level 3 (67) (304) (248)
Purchases 84 153 89
Sales (42) (49) (96)
Issues 0 0 0
Settlements (67) (91) (107)
Balance at end of period 467 514 720
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of period (289) (299) (323)
Total gains (losses) included in: net income 1 6 19
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 (2) (3) (2)
Settlements 6 7 7
Balance at end of period (284) (289) (299)
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 19 25 37
Other investments: Free-standing derivatives 1 1 1
Other liabilities: Free-standing derivatives   3 8
Realized capital gains and losses      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Total gains (losses) included in: net income 9 8 6
Net investment income      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Total gains (losses) included in: net income 10 11 12
Interest credited to contractholder funds      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Total gains (losses) included in: net income (9) (3) 26
Contract benefits      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Total gains (losses) included in: net income 9 9 (7)
Municipal      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period 59 78 106
Total gains (losses) included in: net income 0 12 5
Total gains (losses) included in: OCI 2 (8) (5)
Transfers into Level 3 0 6 0
Transfers out of Level 3 0 0 0
Purchases 0 0 0
Sales (2) (27) (23)
Issues 0 0 0
Settlements (2) (2) (5)
Balance at end of period 57 59 78
Corporate - public      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period 47 44 160
Total gains (losses) included in: net income 1 0 0
Total gains (losses) included in: OCI 0 0 (2)
Transfers into Level 3 3 16 0
Transfers out of Level 3 (15) (15) (111)
Purchases 17 6 1
Sales 0 (3) 0
Issues 0 0 0
Settlements (4) (1) (4)
Balance at end of period 49 47 44
Corporate - privately placed      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period 264 447 632
Total gains (losses) included in: net income 7 15 14
Total gains (losses) included in: OCI (2) 18 (17)
Transfers into Level 3 11 16 10
Transfers out of Level 3 (16) (277) (79)
Purchases 20 108 29
Sales (30) (15) (67)
Issues 0 0 0
Settlements (34) (48) (75)
Balance at end of period 220 264 447
ABS - CDO      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period 27 53 67
Total gains (losses) included in: net income 0 1 0
Total gains (losses) included in: OCI 6 5 2
Transfers into Level 3 4 8 21
Transfers out of Level 3 (10) (1) (17)
Purchases 5 0 0
Sales 0 (2) (1)
Issues 0 0 0
Settlements (22) (37) (19)
Balance at end of period 10 27 53
ABS - consumer and other      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period 42 44 62
Total gains (losses) included in: net income 0 0 (1)
Total gains (losses) included in: OCI 0 (3) 0
Transfers into Level 3 0 3 0
Transfers out of Level 3 (26) (7) (41)
Purchases 29 7 27
Sales 0 0 0
Issues 0 0 0
Settlements (5) (2) (3)
Balance at end of period 40 42 44
CMBS      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period   0 1
Total gains (losses) included in: net income     0
Total gains (losses) included in: OCI     (1)
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
Fixed income securities      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period 439 666 1,028
Total gains (losses) included in: net income 8 28 18
Total gains (losses) included in: OCI 6 12 (23)
Transfers into Level 3 18 49 31
Transfers out of Level 3 (67) (300) (248)
Purchases 71 121 57
Sales (32) (47) (91)
Issues 0 0 0
Settlements (67) (90) (106)
Balance at end of period 376 439 666
Equity securities      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period 76 60 37
Total gains (losses) included in: net income 8 (15) (1)
Total gains (losses) included in: OCI 3 5 (3)
Transfers into Level 3 0 0 0
Transfers out of Level 3 0 (4) 0
Purchases 13 32 32
Sales (10) (2) (5)
Issues 0 0 0
Settlements 0 0 0
Balance at end of period 90 76 60
Free-standing derivatives, net      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period (2) (7) (7)
Total gains (losses) included in: net income 3 6 1
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) (1)
Balance at end of period 1 (2) (7)
Other assets      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period 1 1 1
Total gains (losses) included in: net income (1) 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 0 0
Balance at end of period 0 1 1
Contractholder funds: Derivatives embedded in life and annuity contracts      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of period (289) (299) (323)
Total gains (losses) included in: net income 1 6 19
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 (2) (3) (2)
Settlements 6 7 7
Balance at end of period $ (284) $ (289) $ (299)