Property Casualty Loss and Loss Expenses (Tables)

6 Months Ended

Jun. 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 June 30,						Six months ended June 30,
	2017			2016			2017			2016
Gross loss and loss expense reserves, beginning   of period	$	5,128		$	4,750		$	5,035		$	4,660
Less reinsurance recoverable	297			272			298			281
Net loss and loss expense reserves, beginning of   period	4,831			4,478			4,737			4,379
Net incurred loss and loss expenses related to:
Current accident year	832			808			1,658			1,531
Prior accident years	(38		)	(49		)	(76		)	(111		)
Total incurred	794			759			1,582			1,420
Net paid loss and loss expenses related to:
Current accident year	373			328			558			474
Prior accident years	322			301			831			717
Total paid	695			629			1,389			1,191
Net loss and loss expense reserves, end of period	4,930			4,608			4,930			4,608
Plus reinsurance recoverable	283			310			283			310
Gross loss and loss expense reserves, end of   period	$	5,213		$	4,918		$	5,213		$	4,918