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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, 2019 | Dec. 31, 2018
Liabilities |  |
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) | $ (7) | $ (6)
Contingent Consideration |  |
Liabilities |  |
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) | (7) | (6)
Fair Value, Measurements, Recurring |  |
Assets |  |
Beginning balance |  | 2,030
Total realized/unrealized gains (losses), Included in net income | (4) | 32
Total realized/unrealized gains (losses), Included in OCI | 9 | (35)
Purchases | 895 | 929
Settlements | (405) | (374)
Sales | (142) | (172)
Transfers into Level 3 | 61 | 47
Transfers out of Level 3 | (555) | (811)
Freestanding Derivatives, net |  |
Beginning balance | 4 | 2
Total realized/unrealized gains (losses), Included in net income |  | 3
Total realized/unrealized gains (losses), Included in OCI |  | 0
Purchases |  | 1
Settlements |  | 0
Sales |  | (2)
Transfers into Level 3 |  | 0
Transfers out of Level 3 |  | 0
Ending balance |  | 4
Fair Value, Measurements, Recurring | Contingent Consideration |  |
Liabilities |  |
Beginning balance | (35) | (29)
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) | (7) | (6)
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 0 | 0
Settlements | 20 | 0
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Ending balance | (22) | (35)
Fair Value, Measurements, Recurring | Liability [Member] |  |
Liabilities |  |
Beginning balance | (32) | (29)
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) | (25) | (6)
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 0 | 0
Settlements | 20 | 0
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Ending balance | (37) | (32)
Fair Value, Measurements, Recurring | Derivative [Member] |  |
Freestanding Derivatives, net |  |
Beginning balance | 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 | 1
Fair Value, Measurements, Recurring | Derivative [Member] | Liability [Member] |  |
Freestanding Derivatives, net |  |
Beginning balance | 3 |
Total realized/unrealized gains (losses), Included in net income | (18) |
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 | (15) | 3
Fair Value, Measurements, Recurring | Equity |  |
Freestanding Derivatives, net |  |
Beginning balance | 3 | 1
Total realized/unrealized gains (losses), Included in net income | (18) | 3
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 0 | 1
Settlements | 0 | 0
Sales | 0 | (2)
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Ending balance | (15) | 3
Fair Value, Measurements, Recurring | Interest rate derivatives |  |
Freestanding Derivatives, net |  |
Beginning balance | 1 | 1
Total realized/unrealized gains (losses), Included in net income | (1) | 0
Total realized/unrealized gains (losses), Included in OCI | 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 | 1
Fair Value, Measurements, Recurring | Equity securities |  |
Assets |  |
Beginning balance | 77 | 76
Total realized/unrealized gains (losses), Included in net income |  | 29
Total realized/unrealized gains (losses), Included in OCI |  | 0
Purchases |  | 12
Settlements |  | 0
Sales |  | (40)
Transfers into Level 3 |  | 0
Transfers out of Level 3 |  | 0
Ending balance |  | 77
Fair Value, Measurements, Recurring | Assets [Member] |  |
Assets |  |
Beginning balance | 1,643 |
Ending balance | 1,502 | 1,643
Fair Value, Measurements, Recurring | Equity securities | Short-term Investments [Member] |  |
Assets |  |
Beginning balance | 0 |
Total realized/unrealized gains (losses), Included in net income | 0 |
Total realized/unrealized gains (losses), Included in OCI | 0 |
Purchases | 15 |
Settlements | 0 |
Sales | 0 |
Transfers into Level 3 | 0 |
Transfers out of Level 3 | 0 |
Ending balance | 15 | 0
Fair Value, Measurements, Recurring | Equity securities | Equity securities |  |
Assets |  |
Beginning balance | 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 | 77
Fair Value, Measurements, Recurring | Securities available-for-sale and other | Total fixed maturities |  |
Assets |  |
Beginning balance | 1,565 | 1,952
Total realized/unrealized gains (losses), Included in net income | (3) | 0
Total realized/unrealized gains (losses), Included in OCI | 9 | (35)
Purchases | 871 | 916
Settlements | (405) | (374)
Sales | (129) | (130)
Transfers into Level 3 | 61 | 47
Transfers out of Level 3 | (555) | (811)
Ending balance | 1,414 | 1,565
Fair Value, Measurements, Recurring | Securities available-for-sale and other | ABS | Total fixed maturities |  |
Assets |  |
Beginning balance | 10 | 19
Total realized/unrealized gains (losses), Included in net income | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 20 | 90
Settlements | (1) | (5)
Sales | 0 | (4)
Transfers into Level 3 | 0 | 12
Transfers out of Level 3 | (14) | (102)
Ending balance | 15 | 10
Fair Value, Measurements, Recurring | Securities available-for-sale and other | CDOs | Total fixed maturities |  |
Assets |  |
Beginning balance | 100 | 95
Total realized/unrealized gains (losses), Included in net income | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 329 | 330
Settlements | (127) | 0
Sales | (6) | (13)
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | (201) | (312)
Ending balance | 95 | 100
Fair Value, Measurements, Recurring | Securities available-for-sale and other | CMBS | Total fixed maturities |  |
Assets |  |
Beginning balance | 12 | 69
Total realized/unrealized gains (losses), Included in net income | 0 | (1)
Total realized/unrealized gains (losses), Included in OCI | 1 | 0
Purchases | 34 | 25
Settlements | (4) | (14)
Sales | 0 | (8)
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | (34) | (59)
Ending balance | 9 | 12
Fair Value, Measurements, Recurring | Securities available-for-sale and other | Corporate | Total fixed maturities |  |
Assets |  |
Beginning balance | 520 | 520
Total realized/unrealized gains (losses), Included in net income | (4) | 1
Total realized/unrealized gains (losses), Included in OCI | 16 | (18)
Purchases | 354 | 197
Settlements | (59) | (36)
Sales | (88) | (52)
Transfers into Level 3 | 61 | 31
Transfers out of Level 3 | (68) | (123)
Ending balance | 732 | 520
Fair Value, Measurements, Recurring | Securities available-for-sale and other | Foreign government/government agencies | Total fixed maturities |  |
Assets |  |
Beginning balance | 3 | 2
Total realized/unrealized gains (losses), Included in net income | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 0 | 1
Settlements | 0 | 0
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Ending balance | 3 | 3
Fair Value, Measurements, Recurring | Securities available-for-sale and other | Municipal | Total fixed maturities |  |
Assets |  |
Beginning balance | 0 | 17
Total realized/unrealized gains (losses), Included in net income |  | 0
Total realized/unrealized gains (losses), Included in OCI |  | (1)
Purchases |  | 0
Settlements |  | 0
Sales |  | (1)
Transfers into Level 3 |  | 0
Transfers out of Level 3 |  | (15)
Ending balance |  | 0
Fair Value, Measurements, Recurring | Securities available-for-sale and other | Residential mortgage-backed securities (RMBS) | Total fixed maturities |  |
Assets |  |
Beginning balance | 920 | 1,230
Total realized/unrealized gains (losses), Included in net income | 1 | 0
Total realized/unrealized gains (losses), Included in OCI | (8) | (16)
Purchases | 134 | 273
Settlements | (214) | (319)
Sales | (35) | (52)
Transfers into Level 3 | 0 | 4
Transfers out of Level 3 | (238) | (200)
Ending balance | 560 | 920
Previously Reported [Member] | Fair Value, Measurements, Recurring |  |
Assets |  |
Beginning balance | 1,646 |
Ending balance |  | 1,646
Previously Reported [Member] | Fair Value, Measurements, Recurring | Liability [Member] |  |
Liabilities |  |
Beginning balance | $ (35) |
Ending balance |  | $ (35)

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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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