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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward |  |  |  |
Balance at beginning of period | $ 730 | $ 903 | $ 837 | $ 735
Total gains (losses) included in: net income | 11 | 9 | 15 | 20
Total gains (losses) included in: OCI | (1) | 1 | (3) | 9
Transfers into Level 3 | 25 | 33 | 34 | 60
Transfers out of Level 3 | (26) | (127) | (141) | (149)
Purchases | 91 | 128 | 205 | 288
Sales | (23) | (98) | (132) | (101)
Issues | 0 | 0 | 0 | 0
Settlements | (30) | (7) | (38) | (20)
Balance at end of period | 777 | 842 | 777 | 842
Fair Value Liabilities Measured on Recurring Basis Unobservable Input Reconciliation Calculation |  |  |  |
Balance at the beginning of the period | (262) | (286) | (286) | (290)
Total gains (losses) included in: net income | 1 | 0 | 24 | 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 | (1) | (1)
Settlements | 1 | 1 | 3 | 3
Balance at the end of the period | (260) | (285) | (260) | (285)
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 | 12 | 9 | 39 | 23
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 | 11 | 5 | 15 | 7
Fair value assets and liabilities measured on recurring basis, gain (loss) included in earnings |  |  |  |
Change in unrealized gain (loss) | 13 | (1) | 15 |
(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 |  | 4 |  | 14
Fair value assets and liabilities measured on recurring basis, gain (loss) included in earnings |  |  |  |
Change in unrealized gain (loss) |  | 4 |  | 14
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) | 19 | (6)
Fair value assets and liabilities measured on recurring basis, gain (loss) included in earnings |  |  |  |
Change in unrealized gain (loss) |  | (1) | 19 | (6)
Life contract benefits |  |  |  |
Fair value assets and liabilities measured on recurring basis, gain (loss) included in earnings |  |  |  |
Change in unrealized gain (loss) | 1 | 1 | 5 | 8
Municipal |  |  |  |
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward |  |  |  |
Balance at beginning of period | 96 | 124 | 101 | 125
Total gains (losses) included in: net income | 0 | (2) | 1 | (1)
Total gains (losses) included in: OCI | 0 | 5 | (1) | 6
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | (2) | (1)
Purchases | 10 | 5 | 10 | 5
Sales | 0 | (18) | (2) | (20)
Issues | 0 | 0 | 0 | 0
Settlements | 0 | 0 | (1) | 0
Balance at end of period | 106 | 114 | 106 | 114
Corporate - public |  |  |  |
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward |  |  |  |
Balance at beginning of period | 77 | 60 | 108 | 78
Total gains (losses) included in: net income | 0 | 0 | 0 | 0
Total gains (losses) included in: OCI | (1) | 0 | (2) | 0
Transfers into Level 3 | 0 | 0 | 4 | 0
Transfers out of Level 3 | 0 | 0 | (5) | (16)
Purchases | 0 | (1) | 0 | (1)
Sales | 0 | 1 | (26) | 1
Issues | 0 | 0 | 0 | 0
Settlements | 0 | 0 | (3) | (2)
Balance at end of period | 76 | 60 | 76 | 60
Corporate - privately placed |  |  |  |
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward |  |  |  |
Balance at beginning of period | 215 | 263 | 224 | 263
Total gains (losses) included in: net income | (2) | 6 | (2) | 6
Total gains (losses) included in: OCI | 0 | (7) | (1) | (2)
Transfers into Level 3 | 20 | 30 | 20 | 30
Transfers out of Level 3 | (10) | 0 | (29) | 0
Purchases | 2 | 4 | 15 | 4
Sales | (3) | (29) | (3) | (29)
Issues | 0 | 0 | 0 | 0
Settlements | (27) | (1) | (29) | (6)
Balance at end of period | 195 | 266 | 195 | 266
ABS - CDO |  |  |  |
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward |  |  |  |
Balance at beginning of period | 10 | 147 | 99 | 27
Total gains (losses) included in: net income | 0 | 0 | 0 | 0
Total gains (losses) included in: OCI | 0 | 0 | 0 | 2
Transfers into Level 3 | 0 | 3 | 0 | 30
Transfers out of Level 3 | 0 | (122) | (89) | (122)
Purchases | 0 | 65 | 0 | 160
Sales | 0 | 0 | 0 | 0
Issues | 0 | 0 | 0 | 0
Settlements | (1) | (2) | (1) | (6)
Balance at end of period | 9 | 91 | 9 | 91
ABS - consumer and other |  |  |  |
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward |  |  |  |
Balance at beginning of period | 62 | 80 | 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 | 5 | 0 | 10 | 0
Transfers out of Level 3 | (16) | (5) | (16) | (7)
Purchases | 30 | 48 | 75 | 89
Sales | (7) | 0 | (42) | 0
Issues | 0 | 0 | 0 | 0
Settlements | (1) | (3) | (3) | (4)
Balance at end of period | 73 | 120 | 73 | 120
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 | 27 | 25 | 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 | 0 | 1 | 3
Sales | 0 | 0 | 0 | 0
Issues | 0 | 0 | 0 | 0
Settlements | (1) | (1) | (1) | (1)
Balance at end of period | 26 | 24 | 26 | 24
Fixed income securities |  |  |  |
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward |  |  |  |
Balance at beginning of period | 487 | 699 | 606 | 558
Total gains (losses) included in: net income | (2) | 4 | (1) | 5
Total gains (losses) included in: OCI | (1) | (2) | (3) | 6
Transfers into Level 3 | 25 | 33 | 34 | 60
Transfers out of Level 3 | (26) | (127) | (141) | (146)
Purchases | 42 | 121 | 101 | 260
Sales | (10) | (46) | (73) | (48)
Issues | 0 | 0 | 0 | 0
Settlements | (30) | (7) | (38) | (20)
Balance at end of period | 485 | 675 | 485 | 675
Equity securities |  |  |  |
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward |  |  |  |
Balance at beginning of period | 242 | 170 | 210 | 163
Total gains (losses) included in: net income | 13 | 3 | 16 | 13
Total gains (losses) included in: OCI | 0 | 3 | 0 | 3
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | (3)
Purchases | 49 | 2 | 79 | 3
Sales | (13) | (12) | (14) | (13)
Issues | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Balance at end of period | 291 | 166 | 291 | 166
Short-term investments |  |  |  |
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward |  |  |  |
Balance at beginning of period | 0 | 35 | 20 | 15
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 | 5 | 25 | 25
Sales | 0 | (40) | (45) | (40)
Issues | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Balance at end of period | 0 | 0 | 0 | 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 | 2 | 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 | (262) | (286) | (286) | (290)
Total gains (losses) included in: net income | 1 | 0 | 24 | 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 | (1) | (1)
Settlements | 1 | 1 | 3 | 3
Balance at the end of the period | $ (260) | $ (285) | $ (260) | $ (285)

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- Definition This item represents the amount of the total realized and unrealized gains or losses for the period which are included in the statement of income (or changes in net assets); the fair value of which assets and liabilities was or is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as a liability out of level 3 of the fair value hierarchy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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