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Commitments and Contingencies - Additional Information (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2016 plaintiff | Feb. 28, 2011 plaintiff | Dec. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |
Rental expense on operating leases |  |  |  | $ 57,000,000 | $ 53,000,000 | $ 60,000,000
Sublease rental income |  |  |  | 3,000,000 | 2,000,000 | $ 3,000,000
Outstanding commitments |  |  | $ 989,000,000 | 989,000,000 |  |
Commitments to fund limited partnerships |  |  | 829,000,000 | 829,000,000 |  |
Commitments to fund obligations associated with private placement securities |  |  | 54,000,000 | 54,000,000 |  |
Commitments related to mortgage loans |  |  | 106,000,000 | 106,000,000 |  |
Minimum percentage of written premiums in state for assessment under guaranty funds |  |  |  | 0.01 |  |
Maximum percentage of written premiums in state for assessment under guaranty funds |  |  |  | 0.02 |  |
Guaranty liabilities |  |  | 113,000,000 | 113,000,000 | 126,000,000 |
Fair value of derivative instrument in a net liability position |  |  | 534,000,000 | 534,000,000 |  |
Collateral already posted |  |  | 609,000,000 | 609,000,000 |  |
Additional collateral required |  |  | 10,000,000 | 10,000,000 |  |
Other Assets |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Premium tax offsets |  |  | 6,000,000 | 6,000,000 | 19,000,000 |
Asbestos and Environmental |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Reinsurance premium |  |  |  |  | 650,000,000 |
Maximum adverse loss development to be ceded under agreement |  |  |  |  | 1,500,000,000.0 |
Asbestos |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts |  |  | 1,200,000,000 | 1,200,000,000 |  |
Environmental |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts |  |  | 237,000,000 | 237,000,000 |  |
Asbestos and Environmental |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts |  |  | 1,452,000,000 | 1,452,000,000 | 1,700,000,000 |
Reinsurance premium |  |  |  |  | 650,000,000 |
Maximum adverse loss development to be ceded under agreement |  |  |  |  | $ 1,500,000,000.0 |
Adverse development from comprehensive annual review |  |  | $ 285,000,000 | $ 285,000,000 |  |
Pending Litigation | Mutual Funds Litigation |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of funds on which action has been brought | plaintiff | 6 | 6 |  |  |  |
Settled Litigation | Mutual Funds Litigation |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of funds on which action has been brought | plaintiff | 1 |  |  |  |  |

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- Definition Maximum percentage of premiums written per year to be considered for Assessment under Guaranty Fund. + References No definition available. + Details
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- Definition Minimum percentage of premiums written per year to be considered for Assessment under Guaranty Fund. + References No definition available. + Details
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- Definition The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624258-113959 + Details
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- Definition This item represents a non-contingent liability for the fair value of an obligation to stand ready to perform over the term of a guaranty issued in the event that specified triggering events or conditions occur. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 25 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82913062&loc=d3e11049-110243 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82913062&loc=d3e11019-110243 + Details
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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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