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Other Comprehensive Income (Tables)
 6 Months Ended
Jun. 30, 2018
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 (loss) income on a pre-tax and after-tax basis are as follows:
($ in millions)
Three months ended June 30,
 
2018
 
2017
 
Pre-
tax
 
Tax
 
After-
tax
 
Pre-
tax
 
Tax
 
After-
tax
Unrealized net holding gains and losses arising during the period, net of related offsets
$
(94
)
 
$
20

 
$
(74
)
 
$
178

 
$
(62
)
 
$
116

Less: reclassification adjustment of realized capital gains and losses
(17
)
 
4

 
(13
)
 
(3
)
 
1

 
(2
)
Unrealized net capital gains and losses
(77
)
 
16

 
(61
)
 
181

 
(63
)
 
118

Unrealized foreign currency translation adjustments
6

 
(1
)
 
5

 
—

 
—

 
—

Other comprehensive (loss) income
$
(71
)
 
$
15

 
$
(56
)
 
$
181

 
$
(63
)
 
$
118

 
 
 
 
 
 
 
 
 
 
 
 
 
Six months ended June 30,
 
2018
 
2017
 
Pre-
tax
 
Tax
 
After-
tax
 
Pre-
tax
 
Tax
 
After-
tax
Unrealized net holding gains and losses arising during the period, net of related offsets
$
(320
)
 
$
67

 
$
(253
)
 
$
281

 
$
(99
)
 
$
182

Less: reclassification adjustment of realized capital gains and losses
(21
)
 
4

 
(17
)
 
(1
)
 
—

 
(1
)
Unrealized net capital gains and losses
(299
)
 
63

 
(236
)
 
282

 
(99
)
 
183

Unrealized foreign currency translation adjustments
11

 
(2
)
 
9

 
(5
)
 
2

 
(3
)
Other comprehensive (loss) income
$
(288
)
 
$
61

 
$
(227
)
 
$
277

 
$
(97
)
 
$
180