Insurance Claim Reserves (Tables)

3 Months Ended

Mar. 31, 2020

Insurance Loss Reserves [Abstract]

Claims and claim adjustment expense reserves [Table Text Block]

Claims and claim adjustment expense reserves were as follows:

(in millions)	March 31, 2020		December 31, 2019
Property-casualty	$	51,944	$	51,836
Accident and health	13		13
Total	$	51,957	$	51,849

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:  

	Three Months Ended March 31,
(in millions)	2020			2019
Claims and claim adjustment expense reserves at beginning of year	$	51,836		$	50,653
Less reinsurance recoverables on unpaid losses	8,035			8,182
Cumulative effect of adoption of updated accounting guidance for credit losses at January 1, 2020	53			—
Net reserves at beginning of year	43,854			42,471
Estimated claims and claim adjustment expenses for claims arising in the current year	4,763			4,435
Estimated decrease in claims and claim adjustment expenses for claims arising in prior years	(3		)	(16		)
Total increases	4,760			4,419
Claims and claim adjustment expense payments for claims arising in:
Current year	947			970
Prior years	3,439			3,320
Total payments	4,386			4,290
Unrealized foreign exchange (gain) loss	(210		)	41
Net reserves at end of period	44,018			42,641
Plus reinsurance recoverables on unpaid losses	7,926			8,063
Claims and claim adjustment expense reserves at end of period	$	51,944		$	50,704