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Other Comprehensive Income (Tables)
 9 Months Ended
Sep. 30, 2017
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Schedule of components of other comprehensive income on a pre-tax and after-tax basis
The components of other comprehensive income on a pre-tax and after-tax basis are as follows:
($ in millions)
Three months ended September 30,
 
2017
 
2016
 
Pre-
tax
 
Tax
 
After-
tax
 
Pre-
tax
 
Tax
 
After-
tax
Unrealized net holding gains and losses arising during the period, net of related offsets
$
90

 
$
(31
)
 
$
59

 
$
97

 
$
(34
)
 
$
63

Less: reclassification adjustment of realized capital gains and losses
21

 
(7
)
 
14

 
(15
)
 
5

 
(10
)
Unrealized net capital gains and losses
69

 
(24
)
 
45

 
112

 
(39
)
 
73

Unrealized foreign currency translation adjustments
13

 
(5
)
 
8

 
(4
)
 
1

 
(3
)
Other comprehensive income
$
82

 
$
(29
)
 
$
53

 
$
108

 
$
(38
)
 
$
70

 
 
 
 
 
 
 
 
 
 
 
 
 
Nine months ended September 30,
 
2017
 
2016
 
Pre-
tax
 
Tax
 
After-
tax
 
Pre-
tax
 
Tax
 
After-
tax
Unrealized net holding gains and losses arising during the period, net of related offsets
$
366

 
$
(128
)
 
$
238

 
$
763

 
$
(267
)
 
$
496

Less: reclassification adjustment of realized capital gains and losses
15

 
(5
)
 
10

 
(78
)
 
27

 
(51
)
Unrealized net capital gains and losses
351

 
(123
)
 
228

 
841

 
(294
)
 
547

Unrealized foreign currency translation adjustments
8

 
(3
)
 
5

 
2

 
(1
)
 
1

Other comprehensive income
$
359

 
$
(126
)
 
$
233

 
$
843

 
$
(295
)
 
$
548