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Other Comprehensive Income
 12 Months Ended
Dec. 31, 2017
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Other Comprehensive Income
Other Comprehensive Income
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)
2017
 
2016
 
2015
 
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
$
51

 
$
(18
)
 
$
33

 
$
134

 
$
(46
)
 
$
88

 
$
(1,048
)
 
$
366

 
$
(682
)
Less: reclassification adjustment of realized capital gains and losses
43

 
(15
)
 
28

 
(100
)
 
35

 
(65
)
 
265

 
(93
)
 
172

Unrealized net capital gains and losses
8

 
(3
)
 
5

 
234

 
(81
)
 
153

 
(1,313
)
 
459

 
(854
)
Unrealized foreign currency translation adjustments
17

 
(6
)
 
11

 
6

 
(2
)
 
4

 
(6
)
 
2

 
(4
)
Other comprehensive income (loss)
$
25

 
$
(9
)
 
$
16

 
$
240

 
$
(83
)
 
$
157

 
$
(1,319
)
 
$
461

 
$
(858
)