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Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
 
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
$
(224
)
 
$
47

 
$
(177
)
 
$
105

 
$
(37
)
 
$
68

Less: reclassification adjustment of realized capital gains and losses
(2
)
 
—

 
(2
)
 
4

 
(1
)
 
3

Unrealized net capital gains and losses
(222
)
 
47

 
(175
)
 
101

 
(36
)
 
65

Unrealized foreign currency translation adjustments
5

 
(1
)
 
4

 
(5
)
 
2

 
(3
)
Other comprehensive (loss) income
$
(217
)
 
$
46

 
$
(171
)
 
$
96

 
$
(34
)
 
$
62