Insurance Claim Reserves (Details) - Prior Year Reserve Development - Property-casualty [Member] - USD ($)
$ in Millions |
3 Months Ended |
Mar. 31, 2020 |
Mar. 31, 2019 |
| Liability for claims and claim adjustment expense |
|
|
| Net favorable (unfavorable) prior year reserve development included in estimated claims and claim adjustment expenses incurred for claims arising in prior years |
$ 3
|
$ 16
|
| Net favorable (unfavorable) prior year reserve development impacting the Company's results of operations |
27
|
51
|
| Accretion expense |
12
|
12
|
| Business Insurance [Member] |
|
|
| Liability for claims and claim adjustment expense |
|
|
| Net favorable (unfavorable) prior year reserve development impacting the Company's results of operations |
5
|
(21)
|
| Bond & Specialty Insurance [Member] |
|
|
| Liability for claims and claim adjustment expense |
|
|
| Net favorable (unfavorable) prior year reserve development impacting the Company's results of operations |
0
|
3
|
| Personal Insurance [Member] |
|
|
| Liability for claims and claim adjustment expense |
|
|
| Net favorable (unfavorable) prior year reserve development impacting the Company's results of operations |
$ 22
|
$ 69
|