Property Casualty Loss and Loss Expenses (Tables)

9 Months Ended

Sep. 30, 2018

Premiums Written, Net [Abstract]

Consolidated Property Casualty Loss And Loss Expense Reserves

This table summarizes activity for our consolidated property casualty loss and loss expense reserves:

(Dollars in millions)	Three months ended September 30,						Nine months ended September 30,
	2018			2017			2018			2017
Gross loss and loss expense reserves, beginning   of period	$	5,423		$	5,213		$	5,219		$	5,035
Less reinsurance recoverable	188			283			187			298
Net loss and loss expense reserves, beginning of   period	5,235			4,930			5,032			4,737
Net incurred loss and loss expenses related to:
Current accident year	857			835			2,548			2,493
Prior accident years	(44		)	(20		)	(123		)	(96		)
Total incurred	813			815			2,425			2,397
Net paid loss and loss expenses related to:
Current accident year	392			411			928			969
Prior accident years	313			314			1,186			1,145
Total paid	705			725			2,114			2,114
Net loss and loss expense reserves, end of period	5,343			5,020			5,343			5,020
Plus reinsurance recoverable	186			280			186			280
Gross loss and loss expense reserves, end of   period	$	5,529		$	5,300		$	5,529		$	5,300