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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Liabilities |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities | $ (4) | $ (1) | $ (2) | $ (2)
Contingent Consideration |  |  |  |
Liabilities |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities | (4) | (1) | (2) | (2)
Fair Value, Measurements, Recurring |  |  |  |
Assets |  |  |  |
Beginning balance | 1,987 | 2,242 | 2,030 | 2,202
Total realized/unrealized gains (losses), Included in net income | (1) | 0 | 31 | (6)
Total realized/unrealized gains (losses), Included in OCI | (10) | 19 | (16) | 34
Purchases | 289 | 290 | 477 | 550
Settlements | (114) | (172) | (212) | (272)
Sales | (22) | (52) | (86) | (174)
Transfers into Level 3 | 18 | 0 | 18 | 58
Transfers out of Level 3 | (126) | (98) | (221) | (163)
Ending balance | 2,021 | 2,229 | 2,021 | 2,229
Freestanding Derivatives, net |  |  |  |
Beginning balance | 3 | 9 | 2 | 10
Total realized/unrealized gains (losses), Included in net income | (1) | (4) | 2 | (10)
Total realized/unrealized gains (losses), Included in OCI | 0 | 0 | 0 | 0
Purchases | 1 | 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 | 5 | 3 | 5
Liabilities |  |  |  |
Beginning balance | (27) | (26) | (29) | (25)
Total realized/unrealized gains (losses), Included in Net Income | (4) | (1) | (2) | (2)
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 | (31) | (27) | (31) | (27)
Fair Value, Measurements, Recurring | Contingent Consideration |  |  |  |
Liabilities |  |  |  |
Beginning balance | (27) | (26) | (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 | (31) | (27) | (31) | (27)
Fair Value, Measurements, Recurring | Equity derivatives |  |  |  |
Freestanding Derivatives, net |  |  |  |
Beginning balance | 1 | 4 | 1 | 0
Total realized/unrealized gains (losses), Included in net income | (1) | (2) | 1 | (3)
Total realized/unrealized gains (losses), Included in OCI | 0 | 0 | 0 | 0
Purchases | 1 | 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 | 5 | 1 | 9
Total realized/unrealized gains (losses), Included in net income | 0 |  | 1 | (6)
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 |  | 0 | 0
Ending balance | 2 | 3 | 2 | 3
Fair Value, Measurements, Recurring | Other contracts |  |  |  |
Freestanding Derivatives, net |  |  |  |
Beginning balance |  | 0 |  | 1
Total realized/unrealized gains (losses), Included in net income |  | 0 |  | (1)
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 |  | 0
Fair Value, Measurements, Recurring | Equity Securities, at fair value | Equity Securities, at fair value |  |  |  |
Assets |  |  |  |
Beginning balance | 65 |  | 76 |
Total realized/unrealized gains (losses), Included in net income | 0 |  | 28 |
Total realized/unrealized gains (losses), Included in OCI | 1 |  | 1 |
Purchases | 1 |  | 1 |
Settlements | 0 |  | 0 |
Sales | (1) |  | (40) |
Transfers into Level 3 | 0 |  | 0 |
Transfers out of Level 3 | 0 |  | 0 |
Ending balance | 66 |  | 66 |
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 |  | 0 |  | (2)
Purchases |  | 0 |  | 2
Settlements |  | 0 |  | 0
Sales |  | 0 |  | 0
Transfers into Level 3 |  | 0 |  | 0
Transfers out of Level 3 |  | 0 |  | 0
Ending balance |  | 55 |  | 55
Fair Value, Measurements, Recurring | Securities available-for-sale and other | Total fixed maturities, FVO |  |  |  |
Assets |  |  |  |
Beginning balance | 1,919 | 2,178 | 1,952 | 2,126
Total realized/unrealized gains (losses), Included in net income | 0 | 4 | 1 | 4
Total realized/unrealized gains (losses), Included in OCI | (11) | 19 | (17) | 36
Purchases | 287 | 290 | 475 | 539
Settlements | (114) | (172) | (212) | (270)
Sales | (21) | (52) | (44) | (161)
Transfers into Level 3 | 18 | 0 | 18 | 58
Transfers out of Level 3 | (126) | (98) | (221) | (163)
Ending balance | 1,952 | 2,169 | 1,952 | 2,169
Fair Value, Measurements, Recurring | Securities available-for-sale and other | ABS | Total fixed maturities, FVO |  |  |  |
Assets |  |  |  |
Beginning balance | 14 | 81 | 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 | 50 | 23 | 50 | 56
Settlements | (1) | 0 | (3) | (3)
Sales | 0 | 0 | 0 | 0
Transfers into Level 3 | 3 | 0 | 3 | 23
Transfers out of Level 3 | (9) | (41) | (12) | (58)
Ending balance | 57 | 63 | 57 | 63
Fair Value, Measurements, Recurring | Securities available-for-sale and other | CDOs | Total fixed maturities, FVO |  |  |  |
Assets |  |  |  |
Beginning balance | 106 | 120 | 95 | 154
Total realized/unrealized gains (losses), Included in net income | 0 | 0 | 0 | 0
Total realized/unrealized gains (losses), Included in OCI |  | (3) |  |
Purchases | 77 | 186 | 98 | 186
Settlements | 0 | (100) | 0 | (101)
Sales | (4) | 0 | (4) | 0
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | (20) | 0 | (30) | (36)
Ending balance | 159 | 203 | 159 | 203
Fair Value, Measurements, Recurring | Securities available-for-sale and other | CMBS | Total fixed maturities, FVO |  |  |  |
Assets |  |  |  |
Beginning balance | 33 | 72 | 69 | 59
Total realized/unrealized gains (losses), Included in net income | 0 | 0 | 0 | (1)
Total realized/unrealized gains (losses), Included in OCI | 0 | 0 | (1) | 0
Purchases | 25 | 14 | 25 | 42
Settlements | (2) | (2) | (3) | (4)
Sales | (8) | 0 | (8) | 0
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | (20) | (19) | (54) | (31)
Ending balance | 28 | 65 | 28 | 65
Fair Value, Measurements, Recurring | Securities available-for-sale and other | Corporate | Total fixed maturities, FVO |  |  |  |
Assets |  |  |  |
Beginning balance | 515 | 521 | 520 | 514
Total realized/unrealized gains (losses), Included in net income | 0 | 0 | 1 | 1
Total realized/unrealized gains (losses), Included in OCI | (7) | 6 | (8) | 11
Purchases | 66 | 33 | 131 | 133
Settlements | (18) | (4) | (32) | (41)
Sales | (8) | (20) | (31) | (117)
Transfers into Level 3 | 15 | 0 | 15 | 35
Transfers out of Level 3 | (4) | (8) | (37) | (8)
Ending balance | 559 | 528 | 559 | 528
Fair Value, Measurements, Recurring | Securities available-for-sale and other | Foreign government/government agencies | Total fixed maturities, FVO |  |  |  |
Assets |  |  |  |
Beginning balance | 2 | 49 | 2 | 47
Total realized/unrealized gains (losses), Included in net income | 0 | 0 | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | 0 | 0 | 0 | 2
Purchases | 1 | 5 | 1 | 5
Settlements | 0 | 0 | 0 | 0
Sales | 0 | (2) | 0 | (2)
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | (30) | 0 | (30)
Ending balance | 3 | 22 | 3 | 22
Fair Value, Measurements, Recurring | Securities available-for-sale and other | Municipal | Total fixed maturities, FVO |  |  |  |
Assets |  |  |  |
Beginning balance | 16 | 44 | 17 | 46
Total realized/unrealized gains (losses), Included in net income | 0 | 4 | 0 | 4
Total realized/unrealized gains (losses), Included in OCI | 0 | (2) | (1) | 1
Purchases | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Sales | 0 | (30) | 0 | (35)
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | (7) | 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 | 1,233 | 1,291 | 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 | (4) | 18 | (7) | 22
Purchases | 68 | 29 | 170 | 117
Settlements | (93) | (66) | (174) | (121)
Sales | (1) | 0 | (1) | (7)
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | (66) | 0 | (81) | 0
Ending balance | $ 1,137 | $ 1,272 | $ 1,137 | $ 1,272

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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=66048111&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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=66048111&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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in the income statement for 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (loss) for 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=66048111&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=66048111&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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Fair value 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized on the income statement for 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (loss) for 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=66048111&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in the income statement of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 + Details
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