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- Fair Value Recurring Basis, Unobservable Input (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Assets |  |
Beginning balance |  | $ 2,202
Total realized/unrealized gains (losses), Included in net income |  | (6)
Total realized/unrealized gains (losses), Included in OCI |  | 15
Purchases |  | 260
Settlements |  | (100)
Sales |  | (122)
Transfers into Level 3 |  | 58
Transfers out of Level 3 |  | (65)
Ending balance |  | 2,242
Significant Unobservable Inputs (Level 3) |  |
Liabilities |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities | $ 2 | (1)
Significant Unobservable Inputs (Level 3) | Contingent Consideration |  |
Liabilities |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities | 2 | (1)
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Beginning balance | 2,030 |
Total realized/unrealized gains (losses), Included in net income | 32 |
Total realized/unrealized gains (losses), Included in OCI | (6) |
Purchases | 188 |
Settlements | (98) |
Sales | (64) |
Transfers into Level 3 | 0 |
Transfers out of Level 3 | (95) |
Ending balance | 1,987 |
Freestanding Derivatives, net |  |
Beginning balance | 2 | 10
Total realized/unrealized gains (losses), Included in net income | 3 | (6)
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 0 | 5
Settlements | 0 | 0
Sales | (2) | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Ending balance | 3 | 9
Liabilities |  |
Beginning balance | (29) |
Total realized/unrealized gains (losses), Included in Net Income | 2 |
Total realized/unrealized gains (losses), Included in OCI | 0 |
Purchases | 0 |
Settlements | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales | 0 |
Transfers into Level 3 | 0 |
Transfers out of Level 3 | 0 |
Ending balance | (27) |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Contingent Consideration |  |
Liabilities |  |
Beginning balance | (29) | (25)
Total realized/unrealized gains (losses), Included in Net Income |  | (1)
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 0 | 0
Settlements | 0 | 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Ending balance | (27) | (26)
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Equity |  |
Freestanding Derivatives, net |  |
Beginning balance | 1 | 0
Total realized/unrealized gains (losses), Included in net income | 2 | (1)
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 0 | 5
Settlements | 0 | 0
Sales | (2) | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Ending balance | 1 | 4
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Interest rate derivatives |  |
Freestanding Derivatives, net |  |
Beginning balance | 1 | 9
Total realized/unrealized gains (losses), Included in net income | 1 | (4)
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 | 2 | 5
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | 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
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Equity securities | Equity securities |  |
Assets |  |
Beginning balance | 76 |
Total realized/unrealized gains (losses), Included in net income | 28 |
Total realized/unrealized gains (losses), Included in OCI | 0 |
Purchases | 0 |
Settlements | 0 |
Sales | (39) |
Transfers into Level 3 | 0 |
Transfers out of Level 3 | 0 |
Ending balance | 65 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Fixed Maturities, FVO | Total fixed maturities |  |
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
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities available-for-sale and other | Equity securities |  |
Assets |  |
Beginning balance |  | 55
Total realized/unrealized gains (losses), Included in net income |  | 0
Total realized/unrealized gains (losses), Included in OCI |  | (2)
Purchases |  | 2
Settlements |  | 0
Sales |  | 0
Transfers into Level 3 |  | 0
Transfers out of Level 3 |  | 0
Ending balance |  | 55
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities available-for-sale and other | Total fixed maturities |  |
Assets |  |
Beginning balance | 1,952 | 2,126
Total realized/unrealized gains (losses), Included in net income | 1 | 0
Total realized/unrealized gains (losses), Included in OCI | (6) | 17
Purchases | 188 | 249
Settlements | (98) | (98)
Sales | (23) | (109)
Transfers into Level 3 | 0 | 58
Transfers out of Level 3 | (95) | (65)
Ending balance | 1,919 | 2,178
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities available-for-sale and other | ABS | Total fixed maturities |  |
Assets |  |
Beginning balance | 19 | 45
Total realized/unrealized gains (losses), Included in net income | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 0 | 33
Settlements | (2) | (3)
Sales | 0 | 0
Transfers into Level 3 | 0 | 23
Transfers out of Level 3 | (3) | (17)
Ending balance | 14 | 81
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities available-for-sale and other | CDOs | Total fixed maturities |  |
Assets |  |
Beginning balance | 95 | 154
Total realized/unrealized gains (losses), Included in net income | 0 | 0
Total realized/unrealized gains (losses), Included in OCI |  | 3
Purchases | 21 | 0
Settlements | 0 | (1)
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | (10) | (36)
Ending balance | 106 | 120
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities available-for-sale and other | CMBS | Total fixed maturities |  |
Assets |  |
Beginning balance | 69 | 59
Total realized/unrealized gains (losses), Included in net income | 0 | (1)
Total realized/unrealized gains (losses), Included in OCI | (1) | 0
Purchases | 0 | 28
Settlements | (1) | (2)
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | (34) | (12)
Ending balance | 33 | 72
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities available-for-sale and other | Corporate | Total fixed maturities |  |
Assets |  |
Beginning balance | 520 | 514
Total realized/unrealized gains (losses), Included in net income | 1 | 1
Total realized/unrealized gains (losses), Included in OCI | (1) | 5
Purchases | 65 | 100
Settlements | (14) | (37)
Sales | (23) | (97)
Transfers into Level 3 | 0 | 35
Transfers out of Level 3 | (33) | 0
Ending balance | 515 | 521
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities available-for-sale and other | Foreign government/government agencies | Total fixed maturities |  |
Assets |  |
Beginning balance | 2 | 47
Total realized/unrealized gains (losses), Included in net income | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | 0 | 2
Purchases | 0 | 0
Settlements | 0 | 0
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Ending balance | 2 | 49
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities available-for-sale and other | Municipal | Total fixed maturities |  |
Assets |  |
Beginning balance | 17 | 46
Total realized/unrealized gains (losses), Included in net income | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | (1) | 3
Purchases | 0 | 0
Settlements | 0 | 0
Sales | 0 | (5)
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Ending balance | 16 | 44
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities available-for-sale and other | RMBS | Total fixed maturities |  |
Assets |  |
Beginning balance | 1,230 | 1,261
Total realized/unrealized gains (losses), Included in net income | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | (3) | 4
Purchases | 102 | 88
Settlements | (81) | (55)
Sales | 0 | (7)
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | (15) | 0
Ending balance | $ 1,233 | $ 1,291

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 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 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 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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- Definition Amount of purchases 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)(2) -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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- Definition Amount of sales 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)(2) -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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