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Supplementary Insurance Information - Table (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Deferred policy acquisition costs | $ 1,216 | $ 1,239 | $ 1,184
Reserves for future policy benefits, claims and unpaid losses and LAE | 43,652 | 39,161 | 35,454
Unearned premiums | 2,410 | 2,171 | 2,060
Net earned premiums | 4,601 | 4,352 | 4,328
Net investment income | 1,831 | 1,696 | 1,633
Benefits, claims, losses and settlement expenses | 3,873 | 3,595 | 3,558
Amortization of deferred policy acquisition costs | 690 | 673 | 653
Other operating expenses | 1,578 | 1,443 | 1,369
Net written premiums (excluding life) | 4,754 | 4,389 | 4,400
Property and casualty insurance |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Deferred policy acquisition costs | 270 | 238 | 226
Reserves for future policy benefits, claims and unpaid losses and LAE | 9,678 | 8,563 | 8,127
Unearned premiums | 2,410 | 2,171 | 2,060
Net earned premiums | 4,579 | 4,328 | 4,224
Net investment income | 362 | 350 | 319
Benefits, claims, losses and settlement expenses | 2,955 | 2,762 | 2,695
Amortization of deferred policy acquisition costs | 556 | 520 | 511
Other operating expenses | 867 | 870 | 839
Net written premiums (excluding life) | 4,751 | 4,386 | 4,327
Annuity |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Deferred policy acquisition costs | 920 | 981 | 934
Reserves for future policy benefits, claims and unpaid losses and LAE | 33,316 | 29,907 | 26,622
Net investment income | 1,458 | 1,356 | 1,224
Benefits, claims, losses and settlement expenses | 892 | 800 | 732
Amortization of deferred policy acquisition costs | 130 | 149 | 136
Other operating expenses | 159 | 142 | 123
Run-off long-term care and life |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Deferred policy acquisition costs | 26 | 20 | 24
Reserves for future policy benefits, claims and unpaid losses and LAE | 658 | 691 | 705
Net earned premiums | 22 | 24 | 104
Net investment income | 20 | 21 | 80
Benefits, claims, losses and settlement expenses | 26 | 33 | 131
Amortization of deferred policy acquisition costs | 4 | 4 | 6
Other operating expenses | 11 | 10 | 37
Net written premiums (excluding life) | 3 | 3 | 73
Other |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Net investment income | (9) | (31) | 10
Other operating expenses | $ 541 | $ 421 | $ 370

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- Definition Amount of amortization of deferred policy acquisition costs recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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- Definition Amount of insurance benefits, claims, losses and settlement expenses incurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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- Definition Net amount of deferred policy acquisition costs capitalized on contracts remaining in force on the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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