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Fair Value Measurements - Fair Value Recurring Basis, Unobservable Input (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Freestanding Derivatives, net |  |  |  |
Realized/unrealized gain/loss included in OCI, liabilities |  | $ 0 |  |
Purchases |  | 0 |  |
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 | $ 1,810 | 1,727 | $ 1,502 | $ 1,643
Total realized/unrealized gains (losses), Included in net income | (2) | (5) | (44) | (7)
Total realized/unrealized gains (losses), Included in OCI | 26 | (3) | (8) | 5
Purchases | 217 | 268 | 437 | 772
Settlements | (114) | (67) | (282) | (198)
Sales | 0 | (4) | (34) | (122)
Transfers into Level 3 | 34 | 15 | 493 | 61
Transfers out of Level 3 | (202) | (205) | (295) | (428)
Ending balance | 1,769 | 1,726 | 1,769 | 1,726
Liabilities |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities | 0 | (2) | 12 | (14)
Freestanding Derivatives, net |  |  |  |
Beginning balance |  | 3 |  |
Realized/unrealized gain/loss included in net income, liabilities |  | (2) |  |
Settlements |  | 0 |  |
Ending balance |  | 5 |  | 5
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Other investments |  |  |  |
Freestanding Derivatives, net |  |  |  |
Beginning balance |  |  |  | (1)
Realized/unrealized gain/loss included in net income, liabilities |  |  |  | (1)
Realized/unrealized gain/loss included in OCI, liabilities |  |  |  | 0
Purchases |  |  |  | 0
Settlements |  |  |  | 0
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) | Other liabilities |  |  |  |
Freestanding Derivatives, net |  |  |  |
Beginning balance |  |  |  | (3)
Realized/unrealized gain/loss included in net income, liabilities |  |  |  | (8)
Realized/unrealized gain/loss included in OCI, liabilities |  |  |  | 0
Purchases |  |  |  | 0
Settlements |  |  |  | 0
Sales |  |  |  | 0
Transfers into level 3 |  |  |  | 0
Transfers out of level 3 |  |  |  | 0
Ending balance |  | 5 |  | 5
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Contingent Consideration |  |  |  |
Liabilities |  |  |  |
Beginning balance |  | (21) | (22) | (35)
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities | 0 | 0 | 12 | (6)
Total realized/unrealized gains (losses), Included in OCI |  | 0 | 0 | 0
Purchases |  | 0 | 0 | 0
Settlements |  | 0 | 10 | 20
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales |  | 0 | 0 | 0
Transfers into Level 3 |  | 0 | 0 | 0
Transfers out of Level 3 |  | 0 | 0 | 0
Ending balance | 0 | (21) | 0 | (21)
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Liability [Member] |  |  |  |
Liabilities |  |  |  |
Beginning balance | 0 | (24) | (37) | (32)
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities | 0 | (2) | 48 | (14)
Total realized/unrealized gains (losses), Included in OCI | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 10 | 20
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales | 0 | 0 | (21) | 0
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Ending balance | 0 | (26) | 0 | (26)
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 |  |  | 0 |
Sales |  |  | (21) |
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 |  |  |  |
Freestanding Derivatives, net |  |  |  |
Beginning balance |  | 3 |  | (3)
Realized/unrealized gain/loss included in net income, liabilities |  | (2) |  | (8)
Realized/unrealized gain/loss included in OCI, liabilities |  | 0 |  | 0
Purchases |  | 0 |  | 0
Settlements |  | 0 |  | 0
Sales |  | 0 |  | 0
Transfers into level 3 |  | 0 |  | 0
Transfers out of level 3 |  | 0 |  | 0
Ending balance | 0 | 5 | 0 | 5
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Equity | Liability [Member] |  |  |  |
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 |  |  | 0 |
Sales |  |  | (21) |
Transfers into level 3 |  |  | 0 |
Transfers out of level 3 |  |  | 0 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Interest rate derivatives |  |  |  |
Freestanding Derivatives, net |  |  |  |
Beginning balance |  |  |  | (1)
Realized/unrealized gain/loss included in net income, liabilities |  |  |  | (1)
Realized/unrealized gain/loss included in OCI, liabilities |  |  |  | 0
Purchases |  |  |  | 0
Settlements |  |  |  | 0
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 | 66 |  |  |
Total realized/unrealized gains (losses), Included in net income | 0 |  |  |
Total realized/unrealized gains (losses), Included in OCI | 0 |  |  |
Purchases | 3 |  |  |
Settlements | 0 |  |  |
Sales | 0 |  |  |
Transfers into Level 3 | 0 |  |  |
Transfers out of Level 3 | 0 |  |  |
Ending balance | 69 |  | 69 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Short-term investments |  |  |  |
Assets |  |  |  |
Beginning balance | 14 |  | 15 |
Total realized/unrealized gains (losses), Included in net income | 0 |  | 0 |
Total realized/unrealized gains (losses), Included in OCI | 0 |  | 0 |
Purchases | 0 |  | 0 |
Settlements | 0 |  | (1) |
Sales | 0 |  | 0 |
Transfers into Level 3 | 0 |  | 0 |
Transfers out of Level 3 | 0 |  | 0 |
Ending balance | 14 |  | 14 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities available-for-sale and other | Total fixed maturities, FVO |  |  |  |
Assets |  |  |  |
Beginning balance | 1,730 | 1,655 | 1,414 | 1,565
Total realized/unrealized gains (losses), Included in net income | (2) | (3) | (34) | (3)
Total realized/unrealized gains (losses), Included in OCI | 26 | (3) | (8) | 5
Purchases | 214 | 268 | 431 | 763
Settlements | (114) | (67) | (281) | (198)
Sales | 0 | (4) | (34) | (109)
Transfers into Level 3 | 34 | 15 | 493 | 61
Transfers out of Level 3 | (202) | (205) | (295) | (428)
Ending balance | 1,686 | 1,656 | 1,686 | 1,656
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities available-for-sale and other | ABS | Total fixed maturities, FVO |  |  |  |
Assets |  |  |  |
Beginning balance | 23 | 5 | 15 | 10
Total realized/unrealized gains (losses), Included in net income | 0 | 0 | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | 0 | 0 | (1) | 0
Purchases | 0 | 0 | 43 | 5
Settlements | 0 | 0 | 0 | (1)
Sales | 0 | 0 | 0 | 0
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | (23) | (5) | (57) | (14)
Ending balance | 0 | 0 | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities available-for-sale and other | CLOs | Total fixed maturities, FVO |  |  |  |
Assets |  |  |  |
Beginning balance | 99 | 286 | 95 | 100
Total realized/unrealized gains (losses), Included in net income | 0 | 0 | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | 1 | 0 | (1) | 0
Purchases | 63 | 92 | 82 | 329
Settlements | (3) | (8) | (16) | (18)
Sales | 0 | 0 | 0 | (6)
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | (19) | (74) | (19) | (109)
Ending balance | 141 | 296 | 141 | 296
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities available-for-sale and other | CMBS | Total fixed maturities, FVO |  |  |  |
Assets |  |  |  |
Beginning balance | 20 | 35 | 9 | 12
Total realized/unrealized gains (losses), Included in net income | 0 | 0 | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | 2 | 0 | 2 | 1
Purchases | 66 | 10 | 79 | 34
Settlements | (1) | (1) | (3) | (3)
Sales | 0 | 0 | 0 | 0
Transfers into Level 3 | 5 | 0 | 5 | 0
Transfers out of Level 3 | 0 | (24) | 0 | (24)
Ending balance | 92 | 20 | 92 | 20
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities available-for-sale and other | Corporate | Total fixed maturities, FVO |  |  |  |
Assets |  |  |  |
Beginning balance | 1,109 | 568 | 732 | 520
Total realized/unrealized gains (losses), Included in net income | 1 | (3) | (31) | (4)
Total realized/unrealized gains (losses), Included in OCI | 19 | 0 | 0 | 9
Purchases | 45 | 166 | 161 | 261
Settlements | (62) | (7) | (126) | (13)
Sales | 0 | (4) | (27) | (68)
Transfers into Level 3 | 22 | 15 | 481 | 61
Transfers out of Level 3 | (138) | (12) | (194) | (43)
Ending balance | 996 | 723 | 996 | 723
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities available-for-sale and other | Foreign government/government agencies | Total fixed maturities, FVO |  |  |  |
Assets |  |  |  |
Beginning balance |  | 3 | 3 | 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 | 0 | 0
Transfers into Level 3 |  | 0 | 0 | 0
Transfers out of Level 3 |  | 0 | (3) | 0
Ending balance | 0 | 3 | 0 | 3
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities available-for-sale and other | RMBS | Total fixed maturities, FVO |  |  |  |
Assets |  |  |  |
Beginning balance | 479 | 758 | 560 | 920
Total realized/unrealized gains (losses), Included in net income | 0 | 0 | 0 | 1
Total realized/unrealized gains (losses), Included in OCI | 2 | (3) | (10) | (5)
Purchases | 40 | 0 | 66 | 134
Settlements | (48) | (51) | (136) | (163)
Sales | 0 | 0 | (7) | (35)
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | (22) | (90) | (22) | (238)
Ending balance | 451 | 614 | 451 | 614
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities available-for-sale and other | Municipal | Total fixed maturities, FVO |  |  |  |
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 |
Equity Securities, at fair value | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |  |  |
Assets |  |  |  |
Beginning balance |  | 72 |  | 77
Total realized/unrealized gains (losses), Included in net income |  | (2) |  | (3)
Total realized/unrealized gains (losses), Included in OCI |  | 0 |  | 0
Purchases |  | 0 |  | 9
Settlements |  | 0 |  | 0
Sales |  | 0 |  | (13)
Transfers into Level 3 |  | 0 |  | 0
Transfers out of Level 3 |  | 0 |  | 0
Ending balance |  | $ 70 |  | $ 70
Equity Securities, at fair value | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Equity Securities, at fair value |  |  |  |
Assets |  |  |  |
Beginning balance |  |  | 73 |
Total realized/unrealized gains (losses), Included in net income |  |  | (10) |
Total realized/unrealized gains (losses), Included in OCI |  |  | 0 |
Purchases |  |  | 6 |
Settlements |  |  | 0 |
Sales |  |  | 0 |
Transfers into Level 3 |  |  | 0 |
Transfers out of Level 3 |  |  | 0 |
Ending balance | $ 69 |  | $ 69 |

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=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 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 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=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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- 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=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of sale 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=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of settlement 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=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of transfer of financial instrument classified as an asset 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 an asset 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 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)(1a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as a liability 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=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of sales of financial instrument classified as a liability 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=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of settlements of financial instrument classified as a liability 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=117815213&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as a liability 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) -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 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=117815213&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=117815213&loc=d3e19279-110258 + Details
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