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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward |  |  |  |
Balance at beginning of period | $ 610 | $ 777 | $ 697 | $ 837
Total gains (losses) included in: net income | 12 | 9 | 48 | 24
Total gains (losses) included in: OCI | 1 | (2) | 7 | (5)
Transfers into Level 3 | 50 | 44 | 70 | 78
Transfers out of Level 3 | (42) | (62) | (204) | (203)
Purchases | 143 | 90 | 331 | 295
Sales | (3) | (29) | (168) | (161)
Issues | 0 | 0 | 0 | 0
Settlements | (4) | (31) | (14) | (69)
Balance at end of period | 767 | 796 | 767 | 796
Fair Value Liabilities Measured on Recurring Basis Unobservable Input Reconciliation Calculation |  |  |  |
Balance at the beginning of the period | (437) | (260) | (224) | (286)
Total gains (losses) included in: net income | (14) | (7) | (54) | 17
Total gains (losses) included in: OCI | 0 | 0 | 0 | 0
Transfers into Level 3 | 0 | 0 | (175) | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Issues | (9) | 0 | (9) | (1)
Settlements | 6 | 1 | 8 | 4
Balance at the end of the period | (454) | (266) | (454) | (266)
Total | (2) | 2 | (6) | 41
Realized capital gains and losses |  |  |  |
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward |  |  |  |
Total gains (losses) included in: net income | 7 | 9 | 38 | 24
Net investment income |  |  |  |
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward |  |  |  |
Total gains (losses) included in: net income | 5 | 0 | 10 | 0
Interest credited to contractholder funds |  |  |  |
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward |  |  |  |
Total gains (losses) included in: net income | (13) | (9) | (56) | 10
Life contract benefits |  |  |  |
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward |  |  |  |
Total gains (losses) included in: net income | (1) | 2 | 2 | 7
Municipal |  |  |  |
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward |  |  |  |
Balance at beginning of period | 63 | 106 | 70 | 101
Total gains (losses) included in: net income | 0 | 0 | 0 | 1
Total gains (losses) included in: OCI | 2 | (1) | 4 | (2)
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | (9) | (5) | (11)
Purchases | 0 | 0 | 0 | 10
Sales | (1) | (6) | (4) | (8)
Issues | 0 | 0 | 0 | 0
Settlements | 0 | (1) | (1) | (2)
Balance at end of period | 64 | 89 | 64 | 89
Corporate - public |  |  |  |
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward |  |  |  |
Balance at beginning of period | 46 | 76 | 70 | 108
Total gains (losses) included in: net income | 0 | 0 | 0 | 0
Total gains (losses) included in: OCI | 1 | (1) | 3 | (3)
Transfers into Level 3 | 0 | 12 | 0 | 16
Transfers out of Level 3 | (7) | (4) | (47) | (9)
Purchases | 66 | 10 | 86 | 10
Sales | (2) | (1) | (7) | (27)
Issues | 0 | 0 | 0 | 0
Settlements | 0 | 0 | (1) | (3)
Balance at end of period | 104 | 92 | 104 | 92
Corporate - privately placed |  |  |  |
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward |  |  |  |
Balance at beginning of period | 89 | 195 | 90 | 224
Total gains (losses) included in: net income | 0 | 1 | (1) | (1)
Total gains (losses) included in: OCI | (1) | (1) | 1 | (2)
Transfers into Level 3 | 0 | 0 | 15 | 20
Transfers out of Level 3 | 0 | (20) | (2) | (49)
Purchases | 1 | 6 | 2 | 21
Sales | 0 | (2) | (13) | (5)
Issues | 0 | 0 | 0 | 0
Settlements | (2) | (12) | (5) | (41)
Balance at end of period | 87 | 167 | 87 | 167
ABS - CDO |  |  |  |
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward |  |  |  |
Balance at beginning of period | 10 | 9 | 6 | 99
Total gains (losses) included in: net income | 1 | 0 | 1 | 0
Total gains (losses) included in: OCI | 0 | 1 | 0 | 1
Transfers into Level 3 | 50 | 20 | 51 | 20
Transfers out of Level 3 | (5) | 0 | (5) | (89)
Purchases | 8 | 0 | 11 | 0
Sales | 0 | 0 | 0 | 0
Issues | 0 | 0 | 0 | 0
Settlements | (1) | (1) | (1) | (2)
Balance at end of period | 63 | 29 | 63 | 29
ABS - consumer and other |  |  |  |
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward |  |  |  |
Balance at beginning of period | 43 | 73 | 63 | 48
Total gains (losses) included in: net income | 0 | 0 | 0 | 0
Total gains (losses) included in: OCI | 0 | 0 | 0 | 1
Transfers into Level 3 | 0 | 12 | 0 | 22
Transfers out of Level 3 | (30) | (29) | (145) | (45)
Purchases | 3 | 33 | 124 | 108
Sales | 0 | (20) | (22) | (62)
Issues | 0 | 0 | 0 | 0
Settlements | (1) | (17) | (5) | (20)
Balance at end of period | 15 | 52 | 15 | 52
Residential mortgage-backed securities (“RMBS”) |  |  |  |
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward |  |  |  |
Balance at beginning of period | 1 |  | 0 |
Total gains (losses) included in: net income | 0 |  | 0 |
Total gains (losses) included in: OCI | (1) |  | (1) |
Transfers into Level 3 | 0 |  | 1 |
Transfers out of Level 3 | 0 |  | 0 |
Purchases | 0 |  | 0 |
Sales | 0 |  | 0 |
Issues | 0 |  | 0 |
Settlements | 0 |  | 0 |
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 | 34 | 26 | 26 | 26
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 | 3 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 6 | 1
Sales | 0 | 0 | 0 | 0
Issues | 0 | 0 | 0 | 0
Settlements | 0 | 0 | (1) | (1)
Balance at end of period | 34 | 26 | 34 | 26
Fixed income securities |  |  |  |
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward |  |  |  |
Balance at beginning of period | 286 | 485 | 325 | 606
Total gains (losses) included in: net income | 1 | 1 | 0 | 0
Total gains (losses) included in: OCI | 1 | (2) | 7 | (5)
Transfers into Level 3 | 50 | 44 | 70 | 78
Transfers out of Level 3 | (42) | (62) | (204) | (203)
Purchases | 78 | 49 | 229 | 150
Sales | (3) | (29) | (46) | (102)
Issues | 0 | 0 | 0 | 0
Settlements | (4) | (31) | (14) | (69)
Balance at end of period | 367 | 455 | 367 | 455
Equity securities |  |  |  |
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward |  |  |  |
Balance at beginning of period | 319 | 291 | 341 | 210
Total gains (losses) included in: net income | 11 | 8 | 49 | 24
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 | 55 | 21 | 77 | 100
Sales | 0 | 0 | (82) | (14)
Issues | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Balance at end of period | 385 | 320 | 385 | 320
Short-term investments |  |  |  |
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward |  |  |  |
Balance at beginning of period | 5 | 0 | 30 | 20
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 | 10 | 20 | 25 | 45
Sales | 0 | 0 | (40) | (45)
Issues | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Balance at end of period | 15 | 20 | 15 | 20
Free-standing derivatives, net |  |  |  |
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward |  |  |  |
Balance at beginning of period | 0 | 1 | 1 | 1
Total gains (losses) included in: net income | 0 | 0 | (1) | 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 | 0 | 0
Sales | 0 | 0 | 0 | 0
Issues | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Balance at end of period | 0 | 1 | 0 | 1
Contractholder funds: 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 | (437) | (260) | (224) | (286)
Total gains (losses) included in: net income | (14) | (7) | (54) | 17
Total gains (losses) included in: OCI | 0 | 0 | 0 | 0
Transfers into Level 3 | 0 | 0 | (175) | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Issues | (9) | 0 | (9) | (1)
Settlements | 6 | 1 | 8 | 4
Balance at the end of the period | $ (454) | $ (266) | $ (454) | $ (266)

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- Definition Amount of gain (loss) recognized in income from asset and liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=117815213&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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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