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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, 2019
Mar. 31, 2018
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward    
Balance at beginning of period $ 697 $ 837
Total gains (losses) included in: net income 26 4
Total gains (losses) included in: OCI 4 (2)
Transfers into Level 3 18 9
Transfers out of Level 3 (47) (115)
Purchases 116 114
Sales (93) (109)
Issues 0 0
Settlements (7) (8)
Balance at end of period 714 730
Fair Value Liabilities Measured on Recurring Basis Unobservable Input Reconciliation Calculation    
Balance at the beginning of the period (224) (286)
Total gains (losses) included in: net income (28) 23
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 (1)
Settlements 1 2
Balance at the end of the period (251) (262)
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) 27
Free-standing derivatives 1 1
Realized capital gains (losses)    
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward    
Total gains (losses) included in: net income 26 4
Fair value assets and liabilities measured on recurring basis, gain (loss) included in earnings    
Change in unrealized gain (loss) 4 2
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
Fair value assets and liabilities measured on recurring basis, gain (loss) included in earnings    
Change in unrealized gain (loss) (36) 19
Life contract benefits    
Fair value assets and liabilities measured on recurring basis, gain (loss) included in earnings    
Change in unrealized gain (loss) 8 4
Municipal    
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward    
Balance at beginning of period 70 101
Total gains (losses) included in: net income 0 1
Total gains (losses) included in: OCI 1 (1)
Transfers into Level 3 0 0
Transfers out of Level 3 0 (2)
Purchases 0 0
Sales (2) (2)
Issues 0 0
Settlements (1) (1)
Balance at end of period 68 96
Corporate - public    
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward    
Balance at beginning of period 70 108
Total gains (losses) included in: net income 0 0
Total gains (losses) included in: OCI 1 (1)
Transfers into Level 3 0 4
Transfers out of Level 3 0 (5)
Purchases 20 0
Sales 0 (26)
Issues 0 0
Settlements (1) (3)
Balance at end of period 90 77
Corporate - privately placed    
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward    
Balance at beginning of period 90 224
Total gains (losses) included in: net income (2) 0
Total gains (losses) included in: OCI 2 (1)
Transfers into Level 3 15 0
Transfers out of Level 3 0 (19)
Purchases 0 13
Sales (13) 0
Issues 0 0
Settlements (2) (2)
Balance at end of period 90 215
ABS - CDO    
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward    
Balance at beginning of period 6 99
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 (89)
Purchases 0 0
Sales 0 0
Issues 0 0
Settlements 0 0
Balance at end of period 6 10
ABS - consumer and other    
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward    
Balance at beginning of period 63 48
Total gains (losses) included in: net income 0 0
Total gains (losses) included in: OCI 0 1
Transfers into Level 3 0 5
Transfers out of Level 3 (47) 0
Purchases 78 45
Sales (10) (35)
Issues 0 0
Settlements (3) (2)
Balance at end of period 81 62
Commercial mortgage-backed securities (“CMBS”)    
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward    
Balance at beginning of period 26 26
Total gains (losses) included in: net income 0 0
Total gains (losses) included in: OCI 0 0
Transfers into Level 3 3 0
Transfers out of Level 3 0 0
Purchases 6 1
Sales 0 0
Issues 0 0
Settlements 0 0
Balance at end of period 35 27
Fixed income securities    
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward    
Balance at beginning of period 325 606
Total gains (losses) included in: net income (2) 1
Total gains (losses) included in: OCI 4 (2)
Transfers into Level 3 18 9
Transfers out of Level 3 (47) (115)
Purchases 104 59
Sales (25) (63)
Issues 0 0
Settlements (7) (8)
Balance at end of period 370 487
Equity securities    
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward    
Balance at beginning of period 341 210
Total gains (losses) included in: net income 28 3
Total gains (losses) included in: OCI 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Purchases 2 30
Sales (68) (1)
Issues 0 0
Settlements 0 0
Balance at end of period 303 242
Short-term investments    
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward    
Balance at beginning of period 30 20
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 10 25
Sales 0 (45)
Issues 0 0
Settlements 0 0
Balance at end of period 40 0
Free-standing derivatives, net    
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward    
Balance at beginning of period 1 1
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 0 0
Sales 0 0
Issues 0 0
Settlements 0 0
Balance at end of period 1 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 (224) (286)
Total gains (losses) included in: net income (28) 23
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 (1)
Settlements 1 2
Balance at the end of the period $ (251) $ (262)