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Other Comprehensive Income
 6 Months Ended
Jun. 30, 2017
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Other Comprehensive Income
Other Comprehensive Income
The components of other comprehensive income on a pre-tax and after-tax basis are as follows:
($ in millions)
Three months ended June 30,
 
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
$
479

 
$
(167
)
 
$
312

 
$
663

 
$
(232
)
 
$
431

Less: reclassification adjustment of realized capital gains and losses
64

 
(22
)
 
42

 
11

 
(4
)
 
7

Unrealized net capital gains and losses
415

 
(145
)
 
270

 
652

 
(228
)
 
424

Unrealized foreign currency translation adjustments
17

 
(6
)
 
11

 
7

 
(2
)
 
5

Unrecognized pension and other postretirement benefit cost arising during the period
(3
)
 
2

 
(1
)
 
1

 
—

 
1

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

 
(19
)
 
(24
)
 
9

 
(15
)
Unrecognized pension and other postretirement benefit cost
26

 
(8
)
 
18

 
25

 
(9
)
 
16

Other comprehensive income
$
458

 
$
(159
)
 
$
299

 
$
684

 
$
(239
)
 
$
445

 
 
 
 
 
 
 
 
 
 
 
 
 
Six months ended June 30,
 
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
$
901

 
$
(315
)
 
$
586

 
$
1,381

 
$
(483
)
 
$
898

Less: reclassification adjustment of realized capital gains and losses
174

 
(61
)
 
113

 
(163
)
 
57

 
(106
)
Unrealized net capital gains and losses
727

 
(254
)
 
473

 
1,544

 
(540
)
 
1,004

 
 
 
 
 
 
 
 
 
 
 
 
Unrealized foreign currency translation adjustments
12

 
(4
)
 
8

 
29

 
(10
)
 
19

 
 
 
 
 
 
 
 
 
 
 
 
Unrecognized pension and other postretirement benefit cost arising during the period
(3
)
 
2

 
(1
)
 
(7
)
 
3

 
(4
)
Less: reclassification adjustment of net periodic cost recognized in operating costs and expenses
(58
)
 
20

 
(38
)
 
(48
)
 
17

 
(31
)
Unrecognized pension and other postretirement benefit cost
55

 
(18
)
 
37

 
41

 
(14
)
 
27

Other comprehensive income
$
794

 
$
(276
)
 
$
518

 
$
1,614

 
$
(564
)
 
$
1,050