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Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2017
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Other comprehensive income (loss) 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
$
444

 
$
(155
)
 
$
289

 
$
753

 
$
(263
)
 
$
490

Less: reclassification adjustment of realized capital gains and losses
132

 
(46
)
 
86

 
(139
)
 
49

 
(90
)
Unrealized net capital gains and losses
312

 
(109
)
 
203

 
892

 
(312
)
 
580

Unrealized foreign currency translation adjustments
(5
)
 
2

 
(3
)
 
22

 
(8
)
 
14

Unrecognized pension and other postretirement benefit cost arising during the period
—

 
—

 
—

 
(8
)
 
3

 
(5
)
Less: reclassification adjustment of net periodic cost recognized in operating costs and expenses
(29
)
 
10

 
(19
)
 
(24
)
 
8

 
(16
)
Unrecognized pension and other postretirement benefit cost
29

 
(10
)
 
19

 
16

 
(5
)
 
11

Other comprehensive income
$
336

 
$
(117
)
 
$
219

 
$
930

 
$
(325
)
 
$
605