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Schedule VI. Supplemental Information Concerning Property and Casualty Insurance Operations | 12 Months Ended
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Dec. 31, 2017
Supplemental Information for Property, Casualty Insurance Underwriters [Abstract] |
Schedule VI. Supplemental Information Concerning Property and Casualty Insurance Operations | SCHEDULE VI. SUPPLEMENTAL INFORMATION CONCERNING PROPERTY AND CASUALTY INSURANCE OPERATIONS
As of and for the years ended December 31 | Consolidated Property and Casualty Operations
(In millions) | 2017 |  | 2016 |  | 2015
Balance Sheet Data |  |  |  |  |
Deferred acquisition costs | $ | 632 |  |  | $ | 599 |  |  |  |
Reserves for unpaid claim and claim adjustment expenses | 22,004 |  |  | 22,343 |  |  |  |
Discount deducted from claim and claim adjustment expense reserves above (based on interest rates ranging from 3.5% to 8.0%) | 1,434 |  |  | 1,572 |  |  |  |
Unearned premiums | 4,029 |  |  | 3,762 |  |  |  |
Statement of Operations Data |  |  |  |  |
Net written premiums | $ | 7,069 |  |  | $ | 6,988 |  |  | $ | 6,962 |
Net earned premiums | 6,988 |  |  | 6,924 |  |  | 6,921 |
Net investment income | 1,992 |  |  | 1,952 |  |  | 1,807 |
Incurred claim and claim adjustment expenses related to current year | 5,201 |  |  | 5,025 |  |  | 4,934 |
Incurred claim and claim adjustment expenses related to prior years | (381 | ) |  | (342 | ) |  | (255 | )
Amortization of deferred acquisition costs | 1,233 |  |  | 1,235 |  |  | 1,540 |
Paid claim and claim adjustment expenses | 5,341 |  |  | 5,134 |  |  | 4,945 |

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- Definition The entire disclosure for the supplemental schedule of information for an entity who has a consolidated property-casualty insurance underwriter, unconsolidated property-casualty subsidiary or fifty percent-or-less owned property-casualty equity investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 + Details
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