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Fair Value Measurements - Fair Value Recurring Basis, Unobservable Input (Details) - Fair Value, Measurements, Recurring - Significant Unobservable Inputs (Level 3) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Assets |  |  |  |
Beginning balance | $ 2,010 | $ 1,810 | $ 1,805 | $ 1,502
Total realized/unrealized gains (losses), Included in net income | 4 | (2) | 12 | (44)
Total realized/unrealized gains (losses), Included in OCI | (8) | 26 | (19) | (8)
Purchases | 471 | 217 | 1,222 | 437
Settlements | (120) | (114) | (362) | (282)
Sales | (1) | 0 | (65) | (34)
Transfers into Level 3 | 0 | 34 | 177 | 493
Transfers out of Level 3 | (182) | (202) | (596) | (295)
Ending balance | 2,174 | 1,769 | 2,174 | 1,769
Liabilities |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities | 0 | 0 | 0 | 12
Freestanding Derivatives, net |  |  |  |
Beginning balance |  |  |  | 15
Realized/unrealized gain/loss included in net income, liabilities |  |  |  | 36
Realized/unrealized gain/loss included in OCI, liabilities |  |  |  | 0
Purchases |  |  |  | 0
Sales |  |  |  | 0
Transfers into level 3 |  |  |  | 0
Transfers out of level 3 |  |  |  | 0
Ending balance |  | 0 |  | 0
Other liabilities |  |  |  |
Freestanding Derivatives, net |  |  |  |
Settlements |  |  |  | (21)
Equity |  |  |  |
Freestanding Derivatives, net |  |  |  |
Beginning balance |  |  |  | 15
Realized/unrealized gain/loss included in net income, liabilities |  |  |  | 36
Realized/unrealized gain/loss included in OCI, liabilities |  |  |  | 0
Purchases |  |  |  | 0
Settlements |  |  |  | (21)
Sales |  |  |  | 0
Transfers into level 3 |  |  |  | 0
Transfers out of level 3 |  |  |  | 0
Ending balance |  | 0 |  | 0
Contingent Consideration |  |  |  |
Liabilities |  |  |  |
Beginning balance |  |  |  | (22)
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities | 0 | 0 | 0 | 12
Total realized/unrealized gains (losses), Included in OCI |  |  |  | 0
Purchases |  |  |  | 0
Settlements |  |  |  | 10
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales |  |  |  | 0
Transfers into Level 3 |  |  |  | 0
Transfers out of Level 3 |  |  |  | 0
Ending balance |  | 0 |  | 0
Liability [Member] |  |  |  |
Liabilities |  |  |  |
Beginning balance |  |  |  | (37)
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities |  |  |  | 48
Total realized/unrealized gains (losses), Included in OCI |  |  |  | 0
Purchases |  |  |  | 0
Settlements |  |  |  | (11)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales |  |  |  | 0
Transfers into Level 3 |  |  |  | 0
Transfers out of Level 3 |  |  |  | 0
Ending balance |  | 0 |  | 0
Equity securities, at fair value |  |  |  |
Assets |  |  |  |
Beginning balance | 74 | 66 | 70 | 73
Total realized/unrealized gains (losses), Included in net income | 4 | 0 | 6 | (10)
Total realized/unrealized gains (losses), Included in OCI | 0 | 0 | 0 | 0
Purchases | 2 | 3 | 5 | 6
Settlements | (9) | 0 | (10) | 0
Sales | 0 | 0 | 0 | 0
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Ending balance | 71 | 69 | 71 | 69
Short-term investments |  |  |  |
Assets |  |  |  |
Beginning balance | 18 | 14 | 30 | 15
Total realized/unrealized gains (losses), Included in net income | 0 | 0 | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | 0 | 0 | 0 | 0
Purchases | 8 | 0 | 10 | 0
Settlements | (3) | 0 | (17) | (1)
Sales | 0 | 0 | 0 | 0
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Ending balance | 23 | 14 | 23 | 14
Securities available-for-sale and other | Total Fixed Maturities, AFS |  |  |  |
Assets |  |  |  |
Beginning balance | 1,918 | 1,730 | 1,705 | 1,414
Total realized/unrealized gains (losses), Included in net income | 0 | (2) | 6 | (34)
Total realized/unrealized gains (losses), Included in OCI | (8) | 26 | (19) | (8)
Purchases | 386 | 214 | 1,132 | 431
Settlements | (108) | (114) | (335) | (281)
Sales | (1) | 0 | (65) | (34)
Transfers into Level 3 | 0 | 34 | 177 | 493
Transfers out of Level 3 | (182) | (202) | (596) | (295)
Ending balance | 2,005 | 1,686 | 2,005 | 1,686
Securities available-for-sale and other | ABS | Total Fixed Maturities, AFS |  |  |  |
Assets |  |  |  |
Beginning balance | 14 | 23 | 0 | 15
Total realized/unrealized gains (losses), Included in net income | 0 | 0 | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | 0 | 0 | 0 | (1)
Purchases | 23 | 0 | 42 | 43
Settlements | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | (14) | (23) | (19) | (57)
Ending balance | 23 | 0 | 23 | 0
Securities available-for-sale and other | Collateralized Loan Obligations [Member] | Total Fixed Maturities, AFS |  |  |  |
Assets |  |  |  |
Beginning balance | 375 | 99 | 360 | 95
Total realized/unrealized gains (losses), Included in net income | 0 | 0 | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | 0 | 1 | 0 | (1)
Purchases | 132 | 63 | 391 | 82
Settlements | (34) | (3) | (79) | (16)
Sales | 0 | 0 | 0 | 0
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | (119) | (19) | (318) | (19)
Ending balance | 354 | 141 | 354 | 141
Securities available-for-sale and other | CMBS | Total Fixed Maturities, AFS |  |  |  |
Assets |  |  |  |
Beginning balance | 86 | 20 | 77 | 9
Total realized/unrealized gains (losses), Included in net income | 0 | 0 | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | 0 | 2 | 2 | 2
Purchases | 29 | 66 | 68 | 79
Settlements | 0 | (1) | (3) | (3)
Sales | 0 | 0 | 0 | 0
Transfers into Level 3 | 0 | 5 | 5 | 5
Transfers out of Level 3 | (14) | 0 | (48) | 0
Ending balance | 101 | 92 | 101 | 92
Securities available-for-sale and other | Corporate | Total Fixed Maturities, AFS |  |  |  |
Assets |  |  |  |
Beginning balance | 1,141 | 1,109 | 881 | 732
Total realized/unrealized gains (losses), Included in net income | 0 | 1 | 6 | (31)
Total realized/unrealized gains (losses), Included in OCI | (7) | 19 | (18) | 0
Purchases | 156 | 45 | 405 | 161
Settlements | (29) | (62) | (105) | (126)
Sales | (1) | 0 | (45) | (27)
Transfers into Level 3 | 0 | 22 | 172 | 481
Transfers out of Level 3 | (6) | (138) | (42) | (194)
Ending balance | 1,254 | 996 | 1,254 | 996
Securities available-for-sale and other | Municipal | Total Fixed Maturities, AFS |  |  |  |
Assets |  |  |  |
Beginning balance |  | 0 |  | 0
Total realized/unrealized gains (losses), Included in net income |  | (3) |  | (3)
Total realized/unrealized gains (losses), Included in OCI |  | 2 |  | 2
Purchases |  | 0 |  | 0
Settlements |  | 0 |  | 0
Sales |  | 0 |  | 0
Transfers into Level 3 |  | 7 |  | 7
Transfers out of Level 3 |  | 0 |  | 0
Ending balance |  | 6 |  | 6
Securities available-for-sale and other | Foreign government/government agencies | Total Fixed Maturities, AFS |  |  |  |
Assets |  |  |  |
Beginning balance | 0 |  | 6 | 3
Total realized/unrealized gains (losses), Included in net income | 0 |  | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | 0 |  | 0 | 0
Purchases | 5 |  | 5 | 0
Settlements | 0 |  | 0 | 0
Sales | 0 |  | (6) | 0
Transfers into Level 3 | 0 |  | 0 | 0
Transfers out of Level 3 | 0 |  | 0 | (3)
Ending balance | 5 | 0 | 5 | 0
Securities available-for-sale and other | RMBS | Total Fixed Maturities, AFS |  |  |  |
Assets |  |  |  |
Beginning balance | 302 | 479 | 381 | 560
Total realized/unrealized gains (losses), Included in net income | 0 | 0 | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | (1) | 2 | (3) | (10)
Purchases | 41 | 40 | 221 | 66
Settlements | (45) | (48) | (148) | (136)
Sales | 0 | 0 | (14) | (7)
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | (29) | (22) | (169) | (22)
Ending balance | 268 | $ 451 | 268 | $ 451
Fair Value Option, Other Eligible Items | Collateralized Loan Obligations [Member] | Total Fixed Maturities, AFS |  |  |  |
Assets |  |  |  |
Beginning balance | 0 |  | 0 |
Total realized/unrealized gains (losses), Included in net income | 0 |  | 0 |
Total realized/unrealized gains (losses), Included in OCI | 0 |  | 0 |
Purchases | 75 |  | 75 |
Settlements | 0 |  | 0 |
Sales | 0 |  | 0 |
Transfers into Level 3 | 0 |  | 0 |
Transfers out of Level 3 | 0 |  | 0 |
Ending balance | $ 75 |  | $ 75 |

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- Definition Amount of unrealized gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3) and still held. + 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 (d) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + 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=123874694&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=123874694&loc=d3e19207-110258 + Details
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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 http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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