Insurance Claim Reserves (Tables)

6 Months Ended

Jun. 30, 2021

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, 2021		December 31, 2020
Property-casualty	$	55,895	$	54,510
Accident and health	11		11
Total	$	55,906	$	54,521

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:

	Six Months Ended June 30,
(in millions)	2021		2020
Claims and claim adjustment expense reserves at beginning of year	$	54,510	$	51,836
Less reinsurance recoverables on unpaid losses	8,153		8,035
Cumulative effect of adoption of updated accounting guidance for credit losses at January 1, 2020	—		53
Net reserves at beginning of year	46,357		43,854
Estimated claims and claim adjustment expenses for claims arising in the current year	10,430		9,826
Estimated increase (decrease) in claims and claim adjustment expenses for  claims arising in prior years	(459)		16
Total increases	9,971		9,842
Claims and claim adjustment expense payments for claims arising in:
Current year	3,113		2,664
Prior years	5,274		5,674
Total payments	8,387		8,338
Unrealized foreign exchange (gain) loss	53		(137)
Net reserves at end of period	47,994		45,221
Plus reinsurance recoverables on unpaid losses	7,901		7,876
Claims and claim adjustment expense reserves at end of period	$	55,895	$	53,097