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Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
 
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
$
105

 
$
(37
)
 
$
68

 
$
329

 
$
(115
)
 
$
214

Less: reclassification adjustment of realized capital gains and losses
4

 
(1
)
 
3

 
(41
)
 
14

 
(27
)
Unrealized net capital gains and losses
101

 
(36
)
 
65

 
370

 
(129
)
 
241

Unrealized foreign currency translation adjustments
(5
)
 
2

 
(3
)
 
(3
)
 
1

 
(2
)
Other comprehensive income
$
96

 
$
(34
)
 
$
62

 
$
367

 
$
(128
)
 
$
239