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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Assets |  |  |  |
Beginning balance | $ 1,402 | $ 1,508 | $ 1,502 | $ 1,646
Total realized/unrealized gains (losses), Included in net income | (25) | (4) | (42) | (8)
Total realized/unrealized gains (losses), Included in OCI | 78 | 2 | (34) | 8
Purchases | 88 | 383 | 220 | 504
Settlements | (78) | (73) | (168) | (131)
Sales | (19) | (44) | (34) | (118)
Transfers into Level 3 | 412 | 34 | 459 | 46
Transfers out of Level 3 | (48) | (82) | (93) | (223)
Ending balance | 1,810 | 1,724 | 1,810 | 1,724
Liabilities |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities | 0 | (2) | 12 | (6)
Freestanding Derivatives, net |  |  |  |
Beginning balance |  | (1) |  | (4)
Realized/unrealized gain/loss included in net income, liabilities |  | (4) |  | (7)
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 |  | 3 |  | 3
Contingent Consideration |  |  |  |
Liabilities |  |  |  |
Beginning balance | 0 | (29) | (22) | (35)
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities | 0 | (2) | 12 | (6)
Total realized/unrealized gains (losses), Included in OCI | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Settlements | 0 | 10 | (10) | 20
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales | 0 | 0 | 0 | 0
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Ending balance | 0 | (21) | 0 | (21)
Liability [Member] |  |  |  |
Liabilities |  |  |  |
Beginning balance | 0 | (29) | (37) | (35)
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities | 0 | (2) | 48 | (6)
Total realized/unrealized gains (losses), Included in OCI | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Settlements | 0 | 10 | 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 | (21) | 0 | (21)
Equity |  |  |  |
Freestanding Derivatives, net |  |  |  |
Beginning balance |  | (1) |  | (3)
Realized/unrealized gain/loss included in net income, liabilities |  | (4) |  | (6)
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 | 3 | 0 | 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 |
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
Derivative [Member] | 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 |
Ending balance | 0 |  | 0 |
Equity Securities, at fair value |  |  |  |
Assets |  |  |  |
Beginning balance | 69 |  |  |
Total realized/unrealized gains (losses), Included in net income | (3) |  |  |
Total realized/unrealized gains (losses), Included in OCI | 0 |  |  |
Purchases | 0 |  |  |
Settlements | 0 |  |  |
Sales | 0 |  |  |
Transfers into Level 3 | 0 |  |  |
Transfers out of Level 3 | 0 |  |  |
Ending balance | 66 |  | 66 |
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 |
Securities available-for-sale and other | Total fixed maturities, FVO |  |  |  |
Assets |  |  |  |
Beginning balance | 1,319 | 1,434 | 1,414 | 1,565
Total realized/unrealized gains (losses), Included in net income | (22) | 0 | (32) | 0
Total realized/unrealized gains (losses), Included in OCI | 78 | 2 | (34) | 8
Purchases | 88 | 379 | 217 | 495
Settlements | (78) | (73) | (167) | (131)
Sales | (19) | (39) | (34) | (105)
Transfers into Level 3 | 412 | 34 | 459 | 46
Transfers out of Level 3 | (48) | (82) | (93) | (223)
Ending balance | 1,730 | 1,655 | 1,730 | 1,655
Securities available-for-sale and other | ABS | Total fixed maturities, FVO |  |  |  |
Assets |  |  |  |
Beginning balance | 19 | 9 | 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 | 23 | 5 | 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 | (19) | (9) | (34) | (9)
Ending balance | 23 | 5 | 23 | 5
Securities available-for-sale and other | CLOs | Total fixed maturities, FVO |  |  |  |
Assets |  |  |  |
Beginning balance | 83 | 114 | 95 | 100
Total realized/unrealized gains (losses), Included in net income | 0 | 0 | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | 4 | 0 | (2) | 0
Purchases | 19 | 202 | 19 | 237
Settlements | (7) | (10) | (13) | (10)
Sales | 0 | 0 | 0 | (6)
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | (20) | 0 | (35)
Ending balance | 99 | 286 | 99 | 286
Securities available-for-sale and other | CMBS | Total fixed maturities, FVO |  |  |  |
Assets |  |  |  |
Beginning balance | 18 | 12 | 9 | 12
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 | 3 | 24 | 13 | 24
Settlements | (1) | (1) | (2) | (2)
Sales | 0 | 0 | 0 | 0
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Ending balance | 20 | 35 | 20 | 35
Securities available-for-sale and other | Corporate | Total fixed maturities, FVO |  |  |  |
Assets |  |  |  |
Beginning balance | 709 | 525 | 732 | 520
Total realized/unrealized gains (losses), Included in net income | (22) | 0 | (32) | (1)
Total realized/unrealized gains (losses), Included in OCI | 61 | 2 | (19) | 9
Purchases | 22 | 58 | 116 | 95
Settlements | (28) | (4) | (64) | (6)
Sales | (19) | (39) | (27) | (64)
Transfers into Level 3 | 412 | 34 | 459 | 46
Transfers out of Level 3 | (26) | (8) | (56) | (31)
Ending balance | 1,109 | 568 | 1,109 | 568
Securities available-for-sale and other | Foreign government/government agencies | Total fixed maturities, FVO |  |  |  |
Assets |  |  |  |
Beginning balance | 3 | 3 | 3 | 3
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 | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | (3) | 0 | (3) | 0
Ending balance | 0 | 3 | 0 | 3
Securities available-for-sale and other | RMBS | Total fixed maturities, FVO |  |  |  |
Assets |  |  |  |
Beginning balance | 487 | 771 | 560 | 920
Total realized/unrealized gains (losses), Included in net income | 0 | 0 | 0 | 1
Total realized/unrealized gains (losses), Included in OCI | 13 | 0 | (12) | (2)
Purchases | 21 | 90 | 26 | 134
Settlements | (42) | (58) | (88) | (112)
Sales | 0 | 0 | (7) | (35)
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | (45) | 0 | (148)
Ending balance | 479 | 758 | 479 | 758
Equity Securities, at fair value |  |  |  |
Assets |  |  |  |
Beginning balance |  | 73 |  | 77
Total realized/unrealized gains (losses), Included in net income |  | 0 |  | (1)
Total realized/unrealized gains (losses), Included in OCI |  | 0 |  | 0
Purchases |  | 4 |  | 9
Settlements |  | 0 |  | 0
Sales |  | (5) |  | (13)
Transfers into Level 3 |  | 0 |  | 0
Transfers out of Level 3 |  | 0 |  | 0
Ending balance |  | $ 72 |  | $ 72
Equity Securities, at fair value | 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 |  |  | 3 |
Settlements |  |  | 0 |
Sales |  |  | 0 |
Transfers into Level 3 |  |  | 0 |
Transfers out of Level 3 |  |  | 0 |
Ending balance | $ 66 |  | $ 66 |

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 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 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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