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Fair Value Measurements - Fair Value Recurring Basis, Unobservable Input (Details) - Significant Unobservable Inputs (Level 3) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Liabilities |  |
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) | $ 12 | $ (7)
Fair Value, Measurements, Recurring |  |
Assets |  |
Beginning balance | 1,502 | 1,643
Total realized/unrealized gains (losses), Included in net income | (44) | (4)
Total realized/unrealized gains (losses), Included in OCI | 25 | 9
Purchases | 891 | 895
Settlements | (388) | (405)
Sales | (49) | (142)
Transfers into Level 3 | 507 | 61
Transfers out of Level 3 | (639) | (555)
Ending balance | 1,805 | 1,502
Fair Value, Measurements, Recurring | Contingent Consideration |  |
Liabilities |  |
Beginning balance | (22) | (35)
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) | 12 | (7)
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 0 | 0
Settlements | 10 | 20
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Ending balance | 0 | (22)
Fair Value, Measurements, Recurring | Liability [Member] |  |
Liabilities |  |
Beginning balance | (37) | (32)
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) | 48 | (25)
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 0 | 0
Settlements | (11) | 20
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Ending balance | 0 | (37)
Fair Value, Measurements, Recurring | Other liabilities |  |
Freestanding Derivatives, net |  |
Beginning balance | (15) | 3
Total realized/unrealized gains (losses), Included in net income | 36 | (18)
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 0 | 0
Settlements | (21) | 0
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Ending balance | 0 | (15)
Fair Value, Measurements, Recurring | Other investments |  |
Freestanding Derivatives, net |  |
Beginning balance | 0 | 1
Total realized/unrealized gains (losses), Included in net income |  | (1)
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 |  | 0
Fair Value, Measurements, Recurring | Equity |  |
Freestanding Derivatives, net |  |
Beginning balance | (15) | 3
Total realized/unrealized gains (losses), Included in net income | 36 | (18)
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 0 | 0
Settlements | (21) | 0
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Ending balance | 0 | (15)
Fair Value, Measurements, Recurring | Interest rate derivatives |  |
Freestanding Derivatives, net |  |
Beginning balance | 0 | 1
Total realized/unrealized gains (losses), Included in net income |  | (1)
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 |  | 0
Fair Value, Measurements, Recurring | Equity securities |  |
Assets |  |
Beginning balance | 73 | 77
Total realized/unrealized gains (losses), Included in net income |  | 0
Total realized/unrealized gains (losses), Included in OCI |  | 0
Purchases |  | 9
Settlements |  | 0
Sales |  | (13)
Transfers into Level 3 |  | 0
Transfers out of Level 3 |  | 0
Ending balance |  | 73
Fair Value, Measurements, Recurring | Equity securities | Equity securities |  |
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 | 1 |
Transfers out of Level 3 | 0 |
Ending balance | 70 | 73
Fair Value, Measurements, Recurring | Short-term Investments [Member] |  |
Assets |  |
Beginning balance | 15 | 0
Total realized/unrealized gains (losses), Included in net income | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 30 | 15
Settlements | (15) | 0
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Ending balance | 30 | 15
Fair Value, Measurements, Recurring | Securities available-for-sale and other | Total fixed maturities |  |
Assets |  |
Beginning balance | 1,414 | 1,565
Total realized/unrealized gains (losses), Included in net income | (34) | (3)
Total realized/unrealized gains (losses), Included in OCI | 25 | 9
Purchases | 855 | 871
Settlements | (373) | (405)
Sales | (49) | (129)
Transfers into Level 3 | 506 | 61
Transfers out of Level 3 | (639) | (555)
Ending balance | 1,705 | 1,414
Fair Value, Measurements, Recurring | Securities available-for-sale and other | ABS | Total fixed maturities |  |
Assets |  |
Beginning balance | 15 | 10
Total realized/unrealized gains (losses), Included in net income | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | (1) | 0
Purchases | 43 | 20
Settlements | 0 | (1)
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | (57) | (14)
Ending balance | 0 | 15
Fair Value, Measurements, Recurring | Securities available-for-sale and other | CDOs | Total fixed maturities |  |
Assets |  |
Beginning balance | 95 | 100
Total realized/unrealized gains (losses), Included in net income | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | 1 | 0
Purchases | 389 | 329
Settlements | (43) | (127)
Sales | 0 | (6)
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | (82) | (201)
Ending balance | 360 | 95
Fair Value, Measurements, Recurring | Securities available-for-sale and other | CMBS | Total fixed maturities |  |
Assets |  |
Beginning balance | 9 | 12
Total realized/unrealized gains (losses), Included in net income | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | 3 | 1
Purchases | 79 | 34
Settlements | (5) | (4)
Sales | 0 | 0
Transfers into Level 3 | 13 | 0
Transfers out of Level 3 | (22) | (34)
Ending balance | 77 | 9
Fair Value, Measurements, Recurring | Securities available-for-sale and other | Corporate | Total fixed maturities |  |
Assets |  |
Beginning balance | 732 | 520
Total realized/unrealized gains (losses), Included in net income | (31) | (4)
Total realized/unrealized gains (losses), Included in OCI | 31 | 16
Purchases | 272 | 354
Settlements | (143) | (59)
Sales | (36) | (88)
Transfers into Level 3 | 486 | 61
Transfers out of Level 3 | (430) | (68)
Ending balance | 881 | 732
Fair Value, Measurements, Recurring | Securities available-for-sale and other | Foreign government/government agencies | Total fixed maturities |  |
Assets |  |
Beginning balance | 3 | 3
Total realized/unrealized gains (losses), Included in net income | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 6 | 0
Settlements | 0 | 0
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | (3) | 0
Ending balance | 6 | 3
Fair Value, Measurements, Recurring | Securities available-for-sale and other | Municipal | Total fixed maturities |  |
Assets |  |
Beginning balance | 0 |
Total realized/unrealized gains (losses), Included in net income | (3) |
Total realized/unrealized gains (losses), Included in OCI | 2 |
Purchases | 0 |
Settlements | 0 |
Sales | (6) |
Transfers into Level 3 | 7 |
Transfers out of Level 3 | 0 |
Ending balance | 0 | 0
Fair Value, Measurements, Recurring | Securities available-for-sale and other | Residential mortgage-backed securities ("RMBS") | Total fixed maturities |  |
Assets |  |
Beginning balance | 560 | 920
Total realized/unrealized gains (losses), Included in net income | 0 | 1
Total realized/unrealized gains (losses), Included in OCI | (11) | (8)
Purchases | 66 | 134
Settlements | (182) | (214)
Sales | (7) | (35)
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | (45) | (238)
Ending balance | $ 381 | $ 560

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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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