Insurance Claim Reserves (Tables)

6 Months Ended

Jun. 30, 2018

Insurance Loss Reserves [Abstract]

Claims and claim adjustment expense reserves [Table Text Block]

Claims and claim adjustment expense reserves were as follows:

(in millions)	June 30, 2018		December 31, 2017
Property-casualty	$	49,945	$	49,633
Accident and health	16		17
Total	$	49,961	$	49,650

Reconciliation of beginning and ending property casualty reserve balances for claims and claim adjustment expenses [Table Text Block]

The following table presents a reconciliation of beginning and ending property casualty reserve balances for claims and claim adjustment expenses for the six months ended June 30,2018 and 2017:

(for the six months ended June 30, in millions)	2018			2017
Claims and claim adjustment expense reserves at beginning of year	$	49,633		$	47,929
Less reinsurance recoverables on unpaid losses	8,123			7,981
Net reserves at beginning of year	41,510			39,948
Estimated claims and claim adjustment expenses for claims arising in the current year	9,084			8,493
Estimated decrease in claims and claim adjustment expenses for claims arising in prior years	(268		)	(214		)
Total increases	8,816			8,279
Claims and claim adjustment expense payments for claims arising in:
Current year	2,851			2,699
Prior years	5,454			4,966
Total payments	8,305			7,665
Unrealized foreign exchange (gain) loss	(102		)	117
Net reserves at end of period	41,919			40,679
Plus reinsurance recoverables on unpaid losses	8,026			7,877
Claims and claim adjustment expense reserves at end of period	$	49,945		$	48,556