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Reserve for Property and Casualty Insurance Claims and Claims Expense (Tables)
 9 Months Ended
Sep. 30, 2019
Reserve for Property-Liability Insurance Claims and Claims Expense [Abstract]  
Schedule of liability for unpaid claims and claims adjustment expense
Rollforward of the reserve for property and casualty insurance claims and claims expense
 
 
Nine months ended September 30,
($ in millions)

 
2019
 
2018
Balance as of January 1
 
$
27,423

 
$
26,325

Less recoverables (1)
 
(7,155
)
 
(6,471
)
Net balance as of January 1
 
20,268

 
19,854

Incurred claims and claims expense related to:
 
 
 
 
Current year
 
18,345

 
16,846

Prior years
 
(118
)
 
(135
)
Total incurred
 
18,227

 
16,711

Claims and claims expense paid related to:
 
 
 
 
Current year
 
(10,640
)
 
(10,077
)
Prior years
 
(6,872
)
 
(6,174
)
Total paid
 
(17,512
)
 
(16,251
)
Net balance as of September 30
 
20,983

 
20,314

Plus recoverables
 
7,093

 
6,625

Balance as of September 30
 
$
28,076

 
$
26,939


(1) 
Recoverables comprises reinsurance and indemnification recoverables.
Prior year reserve reestimates included in claims and claims expense (1)
 
 
 
 
Nine months ended September 30,
($ in millions)
 
Non-catastrophes
 
Catastrophes
 
Total
 
 
2019
 
2018
 
2019 (2)
 
2018
 
2019
 
2018
Auto (3)
 
$
(302
)
 
$
(319
)
 
$
(9
)
 
$
(37
)
 
$
(311
)
 
$
(356
)
Homeowners
 
—

 
(38
)
 
59

 
84

 
59

 
46

Other personal lines
 
13

 
(13
)
 
4

 
(2
)
 
17

 
(15
)
Commercial lines
 
18

 
107

 
(1
)
 
—

 
17

 
107

Discontinued Lines and Coverages (4)
 
103

 
85

 
—

 
—

 
103

 
85

Service Businesses
 
(3
)
 
(2
)
 
—

 
—

 
(3
)
 
(2
)
Total prior year reserve reestimates
 
$
(171
)
 
$
(180
)
 
$
53

 
$
45

 
$
(118
)
 
$
(135
)
(1) 
Favorable reserve reestimates are shown in parentheses.
(2) 
Includes $13 million of reinstatement reinsurance premiums incurred during the period related to the 2018 Camp Fire, which primarily impacted homeowners reestimates.
(3) 
Non-catastrophe results related to continued favorable personal lines auto injury coverage development.
(4) 
The Company’s 2019 annual reserve review, using established industry and actuarial best practices, resulted in unfavorable reestimates of $95 million.