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Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2019
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Schedule of components of other comprehensive (loss) income on a pre-tax and after-tax basis
The components of other comprehensive income (loss) on a pre-tax and after-tax basis for the years ended December 31 are as follows:
($ in millions)
2019
 
2018
 
2017
 
Pre-
tax
 
Tax
 
After-
tax
 
Pre-
tax
 
Tax
 
After-
tax
 
Pre-
tax
 
Tax
 
After-
tax
Unrealized net holding gains and losses arising during the period, net of related offsets
$
878

 
$
(184
)
 
$
694

 
$
(483
)
 
$
101

 
$
(382
)
 
$
51

 
$
(18
)
 
$
33

Less: reclassification adjustment of realized capital gains and losses
19

 
(4
)
 
15

 
(35
)
 
7

 
(28
)
 
43

 
(15
)
 
28

Unrealized net capital gains and losses
859

 
(180
)
 
679

 
(448
)
 
94

 
(354
)
 
8

 
(3
)
 
5

Unrealized foreign currency translation adjustments
(22
)
 
5

 
(17
)
 
—

 
—

 
—

 
17

 
(6
)
 
11

Other comprehensive income (loss)
$
837

 
$
(175
)
 
$
662

 
$
(448
)
 
$
94

 
$
(354
)
 
$
25

 
$
(9
)
 
$
16