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Fair Value Measurements - Fair Value Recurring Basis, Unobservable Input (Details) - Significant Unobservable Inputs (Level 3) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Liabilities |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities | $ (1) | $ (1) | $ (3) | $ (3)
Contingent Consideration |  |  |  |
Liabilities |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities | (1) | (1) | (3) | (3)
Fair Value, Measurements, Recurring |  |  |  |
Assets |  |  |  |
Beginning balance | 2,021 | 2,229 | 2,030 | 2,202
Total realized/unrealized gains (losses), Included in net income | (1) | (2) | 30 | (8)
Total realized/unrealized gains (losses), Included in OCI | (4) | 21 | (20) | 55
Purchases | 274 | 111 | 751 | 661
Settlements | (82) | (79) | (294) | (351)
Sales | (38) | (30) | (124) | (204)
Transfers into Level 3 | 9 | 23 | 27 | 81
Transfers out of Level 3 | (229) | (184) | (450) | (347)
Ending balance | 1,950 | 2,089 | 1,950 | 2,089
Freestanding Derivatives, net |  |  |  |
Beginning balance | 3 | 5 | 2 | 10
Total realized/unrealized gains (losses), Included in net income | 0 | (1) | 2 | (11)
Total realized/unrealized gains (losses), Included in OCI | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 1 | 5
Settlements | 0 | 0 | 0 | 0
Sales | 0 | 0 | (2) | 0
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Ending balance | 3 | 4 | 3 | 4
Liabilities |  |  |  |
Beginning balance | (31) | (27) | (29) | (25)
Total realized/unrealized gains (losses), Included in OCI | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
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 | (32) | (28) | (32) | (28)
Fair Value, Measurements, Recurring | Contingent Consideration |  |  |  |
Liabilities |  |  |  |
Beginning balance | (31) | (27) | (29) | (25)
Total realized/unrealized gains (losses), Included in OCI | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
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 | (32) | (28) | (32) | (28)
Fair Value, Measurements, Recurring | Equity |  |  |  |
Freestanding Derivatives, net |  |  |  |
Beginning balance | 1 | 2 | 1 | 0
Total realized/unrealized gains (losses), Included in net income | 0 | 0 | 1 | (3)
Total realized/unrealized gains (losses), Included in OCI | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 1 | 5
Settlements | 0 | 0 | 0 | 0
Sales | 0 | 0 | (2) | 0
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Ending balance | 1 | 2 | 1 | 2
Fair Value, Measurements, Recurring | Interest rate derivatives |  |  |  |
Freestanding Derivatives, net |  |  |  |
Beginning balance | 2 | 3 | 1 | 9
Total realized/unrealized gains (losses), Included in net income | 0 | (1) | 1 | (7)
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 | 0 | 0 | 0 | 0
Ending balance | 2 | 2 | 2 | 2
Fair Value, Measurements, Recurring | Other contracts |  |  |  |
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 |  | 0
Fair Value, Measurements, Recurring | Equity Securities, at fair value | Equity Securities, at fair value |  |  |  |
Assets |  |  |  |
Beginning balance | 66 |  | 76 |
Total realized/unrealized gains (losses), Included in net income | 0 |  | 28 |
Total realized/unrealized gains (losses), Included in OCI | 0 |  | 1 |
Purchases | 12 |  | 13 |
Settlements | 0 |  | 0 |
Sales | 0 |  | (40) |
Transfers into Level 3 | 0 |  | 0 |
Transfers out of Level 3 | 0 |  | 0 |
Ending balance | 78 |  | 78 |
Fair Value, Measurements, Recurring | Fixed Income Securities, Fair Value Option [Member] | Total fixed maturities, FVO |  |  |  |
Assets |  |  |  |
Beginning balance |  |  |  | 11
Total realized/unrealized gains (losses), Included in net income |  |  |  | 0
Total realized/unrealized gains (losses), Included in OCI |  |  |  | 0
Purchases |  |  |  | 4
Settlements |  |  |  | (2)
Sales |  |  |  | (13)
Transfers into Level 3 |  |  |  | 0
Transfers out of Level 3 |  |  |  | 0
Ending balance |  | 0 |  | 0
Fair Value, Measurements, Recurring | Securities available-for-sale and other | Equity Securities, at fair value |  |  |  |
Assets |  |  |  |
Beginning balance |  | 55 |  | 55
Total realized/unrealized gains (losses), Included in net income |  | 0 |  | 0
Total realized/unrealized gains (losses), Included in OCI |  | (2) |  | (4)
Purchases |  | 20 |  | 22
Settlements |  | 0 |  | 0
Sales |  | 0 |  | 0
Transfers into Level 3 |  | 0 |  | 0
Transfers out of Level 3 |  | 0 |  | 0
Ending balance |  | 73 |  | 73
Fair Value, Measurements, Recurring | Securities available-for-sale and other | Total fixed maturities, FVO |  |  |  |
Assets |  |  |  |
Beginning balance | 1,952 | 2,169 | 1,952 | 2,126
Total realized/unrealized gains (losses), Included in net income | (1) | (1) | 0 | 3
Total realized/unrealized gains (losses), Included in OCI | (4) | 23 | (21) | 59
Purchases | 262 | 91 | 737 | 630
Settlements | (82) | (79) | (294) | (349)
Sales | (38) | (30) | (82) | (191)
Transfers into Level 3 | 9 | 23 | 27 | 81
Transfers out of Level 3 | (229) | (184) | (450) | (347)
Ending balance | 1,869 | 2,012 | 1,869 | 2,012
Fair Value, Measurements, Recurring | Securities available-for-sale and other | ABS | Total fixed maturities, FVO |  |  |  |
Assets |  |  |  |
Beginning balance | 57 | 63 | 19 | 45
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 | 39 | 0 | 89 | 56
Settlements | (2) | (3) | (5) | (6)
Sales | 0 | (6) | 0 | (6)
Transfers into Level 3 | 9 | 4 | 12 | 27
Transfers out of Level 3 | (49) | (32) | (61) | (90)
Ending balance | 54 | 26 | 54 | 26
Fair Value, Measurements, Recurring | Securities available-for-sale and other | CLOs | Total fixed maturities, FVO |  |  |  |
Assets |  |  |  |
Beginning balance | 159 | 203 | 95 | 154
Total realized/unrealized gains (losses), Included in net income | 0 | 0 | 0 | 0
Purchases | 211 | 9 | 309 | 195
Settlements | 0 | 0 | 0 | (101)
Sales | 0 | 0 | (4) | 0
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | (74) | (116) | (104) | (152)
Ending balance | 296 | 96 | 296 | 96
Fair Value, Measurements, Recurring | Securities available-for-sale and other | CMBS | Total fixed maturities, FVO |  |  |  |
Assets |  |  |  |
Beginning balance | 28 | 65 | 69 | 59
Total realized/unrealized gains (losses), Included in net income | (1) | (1) | (1) | (2)
Total realized/unrealized gains (losses), Included in OCI | 1 | 0 | 0 | 0
Purchases | 0 | 0 | 25 | 42
Settlements | (1) | (3) | (4) | (7)
Sales | 0 | 0 | (8) | 0
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | (5) | 0 | (59) | (31)
Ending balance | 22 | 61 | 22 | 61
Fair Value, Measurements, Recurring | Securities available-for-sale and other | Corporate | Total fixed maturities, FVO |  |  |  |
Assets |  |  |  |
Beginning balance | 559 | 528 | 520 | 514
Total realized/unrealized gains (losses), Included in net income | 0 | 0 | 1 | 1
Total realized/unrealized gains (losses), Included in OCI | (2) | 5 | (10) | 16
Purchases | 12 | 36 | 143 | 169
Settlements | (2) | (1) | (34) | (42)
Sales | (12) | (24) | (43) | (141)
Transfers into Level 3 | 0 | 19 | 15 | 54
Transfers out of Level 3 | (4) | (30) | (41) | (38)
Ending balance | 551 | 533 | 551 | 533
Fair Value, Measurements, Recurring | Securities available-for-sale and other | Foreign government/government agencies | Total fixed maturities, FVO |  |  |  |
Assets |  |  |  |
Beginning balance | 3 | 22 | 2 | 47
Total realized/unrealized gains (losses), Included in net income | 0 | 0 | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | 0 | 1 | 0 | 3
Purchases | 0 | 7 | 1 | 12
Settlements | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | (2)
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | (5) | 0 | (35)
Ending balance | 3 | 25 | 3 | 25
Fair Value, Measurements, Recurring | Securities available-for-sale and other | Municipal | Total fixed maturities, FVO |  |  |  |
Assets |  |  |  |
Beginning balance | 9 | 16 | 17 | 46
Total realized/unrealized gains (losses), Included in net income | 0 | 0 | 0 | 4
Total realized/unrealized gains (losses), Included in OCI | 0 | 0 | (1) | 1
Purchases | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | (35)
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | (7) | 0
Ending balance | 9 | 16 | 9 | 16
Fair Value, Measurements, Recurring | Securities available-for-sale and other | RMBS | Total fixed maturities, FVO |  |  |  |
Assets |  |  |  |
Beginning balance | 1,137 | 1,272 | 1,230 | 1,261
Total realized/unrealized gains (losses), Included in net income | 0 | 0 | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | (3) | 17 | (10) | 39
Purchases | 0 | 39 | 170 | 156
Settlements | (77) | (72) | (251) | (193)
Sales | (26) | 0 | (27) | (7)
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | (97) | (1) | (178) | (1)
Ending balance | $ 934 | $ 1,255 | $ 934 | $ 1,255

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 (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + 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 (d) -URI http://asc.fasb.org/extlink&oid=99377789&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=99377789&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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