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Reinsurance (Tables) | 6 Months Ended
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Jun. 30, 2017
Reinsurance Disclosures [Abstract] |
Schedule of reductions to premiums and contract charges due to reinsurance premium ceded amounts | Property-liability insurance premiums earned and life and annuity premiums and contract charges have been reduced by reinsurance ceded amounts shown in the following table.
($ in millions) | Three months ended June 30, |  | Six months ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Property-liability insurance premiums earned | $ | 254 |  |  | $ | 248 |  |  | $ | 500 |  |  | $ | 497 |
Life and annuity premiums and contract charges | 75 |  |  | 78 |  |  | 150 |  |  | 152
Schedule of reductions to costs and expenses due to reinsurance ceded amounts | Property-liability insurance claims and claims expense, life and annuity contract benefits and interest credited to contractholder funds have been reduced by the reinsurance ceded amounts shown in the following table.
($ in millions) | Three months ended June 30, |  | Six months ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Property-liability insurance claims and claims expense | $ | 124 |  |  | $ | 241 |  |  | $ | 255 |  |  | $ | 402 |
Life and annuity contract benefits | 70 |  |  | 80 |  |  | 117 |  |  | 147
Interest credited to contractholder funds | 6 |  |  | 6 |  |  | 11 |  |  | 11

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