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Fair Value Measurements - Changes in balances of Level 3 financial assets carried at fair value (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | $ 998 | $ 3,649 | $ 926 | $ 3,706
Total realized/unrealized gains (losses) included in Net income | (1) | 30 | 22 | 156
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | (12) | 22 | (33) | (22)
Purchases and issuances | 64 | 86 | 169 | 437
Sales and settlements | (32) | (196) | (59) | (444)
Transfer into Level 3 | 2 | 5 | 39 | 56
Transfer out of Level 3 | (36) | (12) | (81) | (305)
Sale of annuity business |  | (2,719) |  | (2,719)
Financial assets, Ending Balance | 983 | 865 | 983 | 865
Fixed maturities |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 625 | 602 | 600 | 538
Total realized/unrealized gains (losses) included in Net income | 0 | (2) | 2 | (3)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | (12) | 1 | (33) | (1)
Purchases and issuances | 42 | 60 | 117 | 202
Sales and settlements | (30) | (55) | (54) | (97)
Transfer into Level 3 | 2 | 4 | 36 | 23
Transfer out of Level 3 | (34) | (5) | (75) | (57)
Sale of annuity business |  | 0 |  | 0
Financial assets, Ending Balance | 593 | 605 | 593 | 605
U.S. government agency |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 0 | 0 | 0 | 0
Total realized/unrealized gains (losses) included in Net income | 0 | 0 | 0 | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0 | 0 | 0
Purchases and issuances | 0 | 0 | 0 | 0
Sales and settlements | 0 | 0 | 0 | 0
Transfer into Level 3 | 0 | 0 | 0 | 0
Transfer out of Level 3 | 0 | 0 | 0 | 0
Sale of annuity business |  | 0 |  | 0
Financial assets, Ending Balance | 0 | 0 | 0 | 0
State and municipal |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 33 | 39 | 41 | 39
Total realized/unrealized gains (losses) included in Net income | 0 | 0 | 0 | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | (1) | 0 | (3) | 0
Purchases and issuances | 0 | 0 | 0 | 0
Sales and settlements | 0 | (3) | (1) | (3)
Transfer into Level 3 | 0 | 0 | 0 | 0
Transfer out of Level 3 | (31) | 0 | (36) | 0
Sale of annuity business |  | 0 |  | 0
Financial assets, Ending Balance | 1 | 36 | 1 | 36
Residential MBS |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 11 | 27 | 14 | 38
Total realized/unrealized gains (losses) included in Net income | 0 | 0 | 0 | (3)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0 | 0 | 0
Purchases and issuances | 0 | 0 | 0 | 6
Sales and settlements | 0 | (1) | (1) | (1)
Transfer into Level 3 | 0 | 3 | 0 | 6
Transfer out of Level 3 | (3) | (1) | (5) | (18)
Sale of annuity business |  | 0 |  | 0
Financial assets, Ending Balance | 8 | 28 | 8 | 28
Commercial MBS |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 0 | 0 | 0 | 2
Total realized/unrealized gains (losses) included in Net income | 0 | 0 | 0 | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0 | 0 | 0
Purchases and issuances | 0 | 0 | 0 | 0
Sales and settlements | 0 | 0 | 0 | 0
Transfer into Level 3 | 0 | 0 | 0 | 0
Transfer out of Level 3 | 0 | 0 | 0 | (2)
Sale of annuity business |  | 0 |  | 0
Financial assets, Ending Balance | 0 | 0 | 0 | 0
Collateralized loan obligations |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 0 | 6 | 0 | 16
Total realized/unrealized gains (losses) included in Net income | 0 | 0 | 0 | 1
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0 | 0 | (1)
Purchases and issuances | 0 | 0 | 0 | 0
Sales and settlements | 0 | 0 | 0 | (1)
Transfer into Level 3 | 2 | 0 | 2 | 0
Transfer out of Level 3 | 0 | 0 | 0 | (9)
Sale of annuity business |  | 0 |  | 0
Financial assets, Ending Balance | 2 | 6 | 2 | 6
Other asset-backed securities |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 337 | 326 | 278 | 305
Total realized/unrealized gains (losses) included in Net income | 0 | 0 | 2 | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | (7) | 1 | (16) | 1
Purchases and issuances | 10 | 38 | 57 | 90
Sales and settlements | (27) | (49) | (42) | (72)
Transfer into Level 3 | 0 | 0 | 34 | 14
Transfer out of Level 3 | 0 | (1) | 0 | (23)
Sale of annuity business |  | 0 |  | 0
Financial assets, Ending Balance | 313 | 315 | 313 | 315
Corporate and other |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 244 | 204 | 267 | 138
Total realized/unrealized gains (losses) included in Net income | 0 | (2) | 0 | (1)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | (4) | 0 | (14) | (1)
Purchases and issuances | 32 | 22 | 60 | 106
Sales and settlements | (3) | (2) | (10) | (20)
Transfer into Level 3 | 0 | 1 | 0 | 3
Transfer out of Level 3 | 0 | (3) | (34) | (5)
Sale of annuity business |  | 0 |  | 0
Financial assets, Ending Balance | 269 | 220 | 269 | 220
Equity securities |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 361 | 227 | 313 | 176
Total realized/unrealized gains (losses) included in Net income | 0 | 18 | 22 | 71
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0 | 0 | 0
Purchases and issuances | 21 | 12 | 51 | 24
Sales and settlements | (2) | (5) | (5) | (19)
Transfer into Level 3 | 0 | 0 | 3 | 0
Transfer out of Level 3 | (2) | (7) | (6) | (7)
Sale of annuity business |  | 0 |  | 0
Financial assets, Ending Balance | 378 | 245 | 378 | 245
Assets of MIE |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 12 | 14 | 13 | 21
Total realized/unrealized gains (losses) included in Net income | (1) | (1) | (2) | 3
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0 | 0 | 0
Purchases and issuances | 1 | 1 | 1 | 2
Sales and settlements | 0 | 0 | 0 | 0
Transfer into Level 3 | 0 | 1 | 0 | 1
Transfer out of Level 3 | 0 | 0 | 0 | (12)
Sale of annuity business |  | 0 |  | 0
Financial assets, Ending Balance | $ 12 | 15 | $ 12 | 15
Assets of discontinued annuity operations | Annuity subsidiaries |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance |  | 2,806 |  | 2,971
Total realized/unrealized gains (losses) included in Net income |  | 15 |  | 85
Total realized/unrealized gains (losses) included in other comprehensive income (loss) |  | 21 |  | (21)
Purchases and issuances |  | 13 |  | 209
Sales and settlements |  | (136) |  | (328)
Transfer into Level 3 |  | 0 |  | 32
Transfer out of Level 3 |  | 0 |  | (229)
Sale of annuity business |  | (2,719) |  | (2,719)
Financial assets, Ending Balance |  | $ 0 |  | $ 0

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- Definition Amount of gain (loss) recognized in income 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)(1) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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