Property Casualty Loss and Loss Expenses (Tables)

9 Months Ended

Sep. 30, 2017

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,
	2017			2016			2017			2016
Gross loss and loss expense reserves, beginning   of period	$	5,213		$	4,918		$	5,035		$	4,660
Less reinsurance recoverable	283			310			298			281
Net loss and loss expense reserves, beginning of   period	4,930			4,608			4,737			4,379
Net incurred loss and loss expenses related to:
Current accident year	835			730			2,493			2,261
Prior accident years	(20		)	(40		)	(96		)	(151		)
Total incurred	815			690			2,397			2,110
Net paid loss and loss expenses related to:
Current accident year	411			374			969			848
Prior accident years	314			288			1,145			1,005
Total paid	725			662			2,114			1,853
Net loss and loss expense reserves, end of period	5,020			4,636			5,020			4,636
Plus reinsurance recoverable	280			301			280			301
Gross loss and loss expense reserves, end of   period	$	5,300		$	4,937		$	5,300		$	4,937