Insurance Claim Reserves (Tables)

6 Months Ended

Jun. 30, 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)	June 30, 2020		December 31, 2019
Property-casualty	$	53,097	$	51,836
Accident and health	12		13
Total	$	53,109	$	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:  

	Six Months Ended June 30,
(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	9,826		9,329
Estimated increase (decrease) in claims and claim adjustment expenses for claims arising in prior years	16		(118)
Total increases	9,842		9,211
Claims and claim adjustment expense payments for claims arising in:
Current year	2,664		2,810
Prior years	5,674		5,897
Total payments	8,338		8,707
Unrealized foreign exchange (gain) loss	(137)		62
Net reserves at end of period	45,221		43,037
Plus reinsurance recoverables on unpaid losses	7,876		8,022
Claims and claim adjustment expense reserves at end of period	$	53,097	$	51,059