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Reinsurance (Tables) | 12 Months Ended
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Dec. 31, 2017
Reinsurance Disclosures [Abstract] |
Effects of reinsurance on property-liability insurance premiums written and earned and life and annuity premiums and contract charges |
Effects of reinsurance on property and casualty premiums written and earned and life premiums and contract charges
|  | For the years ended December 31,
($ in millions) |  | 2017 |  | 2016 |  | 2015
Property and casualty insurance premiums written |  |  |  |  |  |
Direct |  | $ | 33,685 |  |  | $ | 32,614 |  |  | $ | 31,924 |
Assumed |  | 64 |  |  | 47 |  |  | 39 |
Ceded |  | (1,007 | ) |  | (1,061 | ) |  | (1,092 | )
Property and casualty insurance premiums written, net of reinsurance |  | $ | 32,742 |  |  | $ | 31,600 |  |  | $ | 30,871 |
Property and casualty insurance premiums earned |  |  |  |  |  |
Direct |  | $ | 33,221 |  |  | $ | 32,249 |  |  | $ | 31,274 |
Assumed |  | 50 |  |  | 45 |  |  | 41 |
Ceded |  | (971 | ) |  | (987 | ) |  | (1,006 | )
Property and casualty insurance premiums earned, net of reinsurance |  | $ | 32,300 |  |  | $ | 31,307 |  |  | $ | 30,309 |
Life premiums and contract charges |  |  |  |  |  |
Direct |  | $ | 1,894 |  |  | $ | 1,766 |  |  | $ | 1,641 |
Assumed |  | 787 |  |  | 818 |  |  | 849 |
Ceded |  | (303 | ) |  | (309 | ) |  | (332 | )
Life premiums and contract charges, net of reinsurance |  | $ | 2,378 |  |  | $ | 2,275 |  |  | $ | 2,158 |
Summary of retention limits by period of policy issuance |
Retention limits by period of policy issuance
Period |  | Retention limits
April 2015 through current |  | Single life: $2 million per life Joint life: no longer offered
April 2011 through March 2015 |  | Single life: $5 million per life, $3 million age 70 and over, and $10 million for contracts that meet specific criteria Joint life: $8 million per life, and $10 million for contracts that meet specific criteria
July 2007 through March 2011 |  | $5 million per life, $3 million age 70 and over, and $10 million for contracts that meet specific criteria
September 1998 through June 2007 |  | $2 million per life, in 2006 the limit was increased to $5 million for instances when specific criteria were met
August 1998 and prior |  | Up to $1 million per life
Summary of reinsurance recoverables on paid and unpaid benefits |
Reinsurance recoverables on paid and unpaid benefits
|  | As of December 31,
($ in millions) |  | 2017 |  | 2016
Annuities |  | $ | 1,370 |  |  | $ | 1,424 |
Life insurance |  | 817 |  |  | 860 |
Other |  | 167 |  |  | 184 |
Total |  | $ | 2,354 |  |  | $ | 2,468 |

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- Definition Schedule of the effects of reinsurance on premiums written, premiums earned and contract charges, including amounts written and earned directly by the insurer, amounts assumed from other insurers, and amounts ceded to other insurers. + References No definition available. + Details
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- Definition Schedule of details regarding reinsurance which is recoverable as of the balance sheet date from reinsurers for claims paid or incurred by the ceding insurer and associated claims settlement expenses, including estimated amounts for claims incurred but not reported and policy benefits, net of any related valuation allowance. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Tabular disclosure of reinsurance retention policy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6811-158387 + Details
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