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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
Mar. 31, 2018
Mar. 31, 2017
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward    
Balance at beginning of period $ 837 $ 735
Total gains (losses) included in: net income 4 11
Total gains (losses) included in: OCI (2) 8
Transfers into Level 3 9 27
Transfers out of Level 3 (115) (22)
Purchases 114 160
Sales (109) (3)
Issues 0 0
Settlements (8) (13)
Balance at end of period 730 903
Fair Value Liabilities Measured on Recurring Basis Unobservable Input Reconciliation Calculation    
Balance at the beginning of the period (286) (290)
Total gains (losses) included in: net income (23) (3)
Total gains (losses) included in: OCI 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Purchases 0 0
Sales 0 0
Issues (1) (1)
Settlements 2 2
Balance at the end of the period (262) (286)
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 27 14
Free-standing derivatives 1 1
Free-standing derivatives, liabilities   2
Realized capital gains and losses    
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward    
Total gains (losses) included in: net income 4 2
Fair value assets and liabilities measured on recurring basis, gain (loss) included in earnings    
Change in unrealized gain (loss) 2 1
(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   10
Fair value assets and liabilities measured on recurring basis, gain (loss) included in earnings    
Change in unrealized gain (loss)   10
Interest credited to contractholder funds    
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward    
Total gains (losses) included in: net income 19 (5)
Fair value assets and liabilities measured on recurring basis, gain (loss) included in earnings    
Change in unrealized gain (loss) 19 (5)
Life contract benefits    
Fair value assets and liabilities measured on recurring basis, gain (loss) included in earnings    
Change in unrealized gain (loss) 4 7
Municipal    
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward    
Balance at beginning of period 101 125
Total gains (losses) included in: net income 1 1
Total gains (losses) included in: OCI (1) 1
Transfers into Level 3 0 0
Transfers out of Level 3 (2) (1)
Purchases 0 0
Sales (2) (2)
Issues 0 0
Settlements (1) 0
Balance at end of period 96 124
Corporate - public    
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward    
Balance at beginning of period 108 78
Total gains (losses) included in: net income 0 0
Total gains (losses) included in: OCI (1) 0
Transfers into Level 3 4 0
Transfers out of Level 3 (5) (16)
Purchases 0 0
Sales (26) 0
Issues 0 0
Settlements (3) (2)
Balance at end of period 77 60
Corporate - privately placed    
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward    
Balance at beginning of period 224 263
Total gains (losses) included in: net income 0 0
Total gains (losses) included in: OCI (1) 5
Transfers into Level 3 0 0
Transfers out of Level 3 (19) 0
Purchases 13 0
Sales 0 0
Issues 0 0
Settlements (2) (5)
Balance at end of period 215 263
ABS - CDO    
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward    
Balance at beginning of period 99 27
Total gains (losses) included in: net income 0 0
Total gains (losses) included in: OCI 0 2
Transfers into Level 3 0 27
Transfers out of Level 3 (89) 0
Purchases 0 95
Sales 0 0
Issues 0 0
Settlements 0 (4)
Balance at end of period 10 147
ABS - consumer and other    
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward    
Balance at beginning of period 48 42
Total gains (losses) included in: net income 0 0
Total gains (losses) included in: OCI 1 0
Transfers into Level 3 5 0
Transfers out of Level 3 0 (2)
Purchases 45 41
Sales (35) 0
Issues 0 0
Settlements (2) (1)
Balance at end of period 62 80
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
Commercial mortgage-backed securities (“CMBS”)    
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward    
Balance at beginning of period 26 22
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 1 3
Sales 0 0
Issues 0 0
Settlements 0 0
Balance at end of period 27 25
Fixed income securities    
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward    
Balance at beginning of period 606 558
Total gains (losses) included in: net income 1 1
Total gains (losses) included in: OCI (2) 8
Transfers into Level 3 9 27
Transfers out of Level 3 (115) (19)
Purchases 59 139
Sales (63) (2)
Issues 0 0
Settlements (8) (13)
Balance at end of period 487 699
Equity securities    
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward    
Balance at beginning of period 210 163
Total gains (losses) included in: net income 3 10
Total gains (losses) included in: OCI 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 (3)
Purchases 30 1
Sales (1) (1)
Issues 0 0
Settlements 0 0
Balance at end of period 242 170
Short-term investments    
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward    
Balance at beginning of period 20 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 25 20
Sales (45) 0
Issues 0 0
Settlements 0 0
Balance at end of period 0 35
Free-standing derivatives, net    
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward    
Balance at beginning of period 1 (2)
Total gains (losses) included in: net income 0 1
Total gains (losses) included in: OCI 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Purchases 0 0
Sales 0 0
Issues 0 0
Settlements 0 0
Balance at end of period 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
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) (290)
Total gains (losses) included in: net income (23) (3)
Total gains (losses) included in: OCI 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Purchases 0 0
Sales 0 0
Issues (1) (1)
Settlements 2 2
Balance at the end of the period $ (262) $ (286)