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Fair Value Measurements - Fair Value Recurring Basis, Unobservable Input (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Freestanding Derivatives, net |  |  |  |
Sales |  |  |  | $ 0
Transfers into level 3 |  |  |  | 0
Transfers out of level 3 |  |  |  | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |  |  |
Assets |  |  |  |
Beginning balance | $ 2,004 | $ 1,402 | $ 1,805 | 1,502
Total realized/unrealized gains (losses), Included in net income | 3 | (25) | 8 | (42)
Total realized/unrealized gains (losses), Included in OCI | 3 | 78 | (11) | (34)
Purchases | 380 | 88 | 751 | 220
Settlements | (158) | (78) | (242) | (168)
Sales | (47) | (19) | (64) | (34)
Transfers into Level 3 | 129 | 412 | 177 | 459
Transfers out of Level 3 | (304) | (48) | (414) | (93)
Ending balance | 2,010 | 1,810 | 2,010 | 1,810
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
Ending balance |  | 0 |  | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Other liabilities |  |  |  |
Freestanding Derivatives, net |  |  |  |
Settlements |  |  |  | (21)
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | 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
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | 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
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | 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
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Equity Securities, at fair value |  |  |  |
Assets |  |  |  |
Beginning balance | 70 | 69 | 70 | 73
Total realized/unrealized gains (losses), Included in net income | 2 | (3) | 2 | (10)
Total realized/unrealized gains (losses), Included in OCI | 0 | 0 | 0 | 0
Purchases | 3 | 0 | 3 | 3
Settlements | (1) | 0 | (1) | 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 | 74 | 66 | 74 | 66
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Short-term investments |  |  |  |
Assets |  |  |  |
Beginning balance | 16 | 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 | 2 | 0 | 2 | 0
Settlements | 0 | 0 | (14) | (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 | 18 | 14 | 18 | 14
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities available-for-sale and other | Total Fixed Maturities, AFS |  |  |  |
Assets |  |  |  |
Beginning balance | 1,918 | 1,319 | 1,705 | 1,414
Total realized/unrealized gains (losses), Included in net income | 1 | (22) | 6 | (32)
Total realized/unrealized gains (losses), Included in OCI | 3 | 78 | (11) | (34)
Purchases | 375 | 88 | 746 | 217
Settlements | (157) | (78) | (227) | (167)
Sales | (47) | (19) | (64) | (34)
Transfers into Level 3 | 129 | 412 | 177 | 459
Transfers out of Level 3 | (304) | (48) | (414) | (93)
Ending balance | 1,918 | 1,730 | 1,918 | 1,730
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities available-for-sale and other | ABS | Total Fixed Maturities, AFS |  |  |  |
Assets |  |  |  |
Beginning balance | 6 | 19 | 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 | 13 | 23 | 19 | 43
Settlements | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | (5) | (19) | (5) | (34)
Ending balance | 14 | 23 | 14 | 23
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities available-for-sale and other | Collateralized Loan Obligations [Member] | Total Fixed Maturities, AFS |  |  |  |
Assets |  |  |  |
Beginning balance | 426 | 83 | 360 | 95
Total realized/unrealized gains (losses), Included in net income | 0 | 0 | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | 0 | 4 | 0 | (2)
Purchases | 119 | 19 | 259 | 19
Settlements | (30) | (7) | (45) | (13)
Sales | 0 | 0 | 0 | 0
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | (140) | 0 | (199) | 0
Ending balance | 375 | 99 | 375 | 99
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities available-for-sale and other | CMBS | Total Fixed Maturities, AFS |  |  |  |
Assets |  |  |  |
Beginning balance | 61 | 18 | 77 | 9
Total realized/unrealized gains (losses), Included in net income | 0 | 0 | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | 2 | 0 | 2 | 0
Purchases | 38 | 3 | 39 | 13
Settlements | (1) | (1) | (3) | (2)
Sales | 0 | 0 | 0 | 0
Transfers into Level 3 | 5 | 0 | 5 | 0
Transfers out of Level 3 | (19) | 0 | (34) | 0
Ending balance | 86 | 20 | 86 | 20
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities available-for-sale and other | Corporate | Total Fixed Maturities, AFS |  |  |  |
Assets |  |  |  |
Beginning balance | 944 | 709 | 881 | 732
Total realized/unrealized gains (losses), Included in net income | 1 | (22) | 6 | (32)
Total realized/unrealized gains (losses), Included in OCI | 2 | 61 | (11) | (19)
Purchases | 176 | 22 | 249 | 116
Settlements | (69) | (28) | (76) | (64)
Sales | (37) | (19) | (44) | (27)
Transfers into Level 3 | 124 | 412 | 172 | 459
Transfers out of Level 3 | 0 | (26) | (36) | (56)
Ending balance | 1,141 | 1,109 | 1,141 | 1,109
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities available-for-sale and other | Foreign government/government agencies | Total Fixed Maturities, AFS |  |  |  |
Assets |  |  |  |
Beginning balance |  | 3 | 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 |  | 0 | 0 | 0
Settlements |  | 0 | 0 | 0
Sales |  | 0 | (6) | 0
Transfers into Level 3 |  | 0 | 0 | 0
Transfers out of Level 3 |  | (3) | 0 | (3)
Ending balance | 0 | 0 | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities available-for-sale and other | RMBS | Total Fixed Maturities, AFS |  |  |  |
Assets |  |  |  |
Beginning balance | 481 | 487 | 381 | 560
Total realized/unrealized gains (losses), Included in net income | 0 | 0 | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | (1) | 13 | (2) | (12)
Purchases | 29 | 21 | 180 | 26
Settlements | (57) | (42) | (103) | (88)
Sales | (10) | 0 | (14) | (7)
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | (140) | 0 | (140) | 0
Ending balance | $ 302 | $ 479 | $ 302 | $ 479

X
- 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 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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- 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=123874694&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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)(2) -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 derivative asset (liability) after deduction of derivative liability (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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19279-110258 + Details
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- Definition Amount of purchases of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19279-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Amount of sales of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19279-110258 + Details
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