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Other Comprehensive Income (Tables)
 6 Months Ended
Jun. 30, 2018
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Other comprehensive income (loss) on a pre-tax and after-tax basis
Components of other comprehensive income (loss) on a pre-tax and after-tax basis
($ in millions)
 
Three months ended June 30,
 
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
 
$
(249
)
 
$
53

 
$
(196
)
 
$
479

 
$
(167
)
 
$
312

Less: reclassification adjustment of realized capital gains and losses
 
(80
)
 
17

 
(63
)
 
64

 
(22
)
 
42

Unrealized net capital gains and losses
 
(169
)
 
36

 
(133
)
 
415

 
(145
)
 
270

Unrealized foreign currency translation adjustments
 
(9
)
 
2

 
(7
)
 
17

 
(6
)
 
11

Unrecognized pension and other postretirement benefit cost arising during the period
 
1

 
—

 
1

 
(3
)
 
2

 
(1
)
Less: reclassification adjustment of net periodic cost recognized in operating costs and expenses
 
(27
)
 
6

 
(21
)
 
(29
)
 
10

 
(19
)
Unrecognized pension and other postretirement benefit cost
 
28

 
(6
)
 
22

 
26

 
(8
)
 
18

Other comprehensive (loss) income
 
$
(150
)
 
$
32

 
$
(118
)
 
$
458

 
$
(159
)
 
$
299

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Six months ended June 30,
 
 
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
 
$
(990
)
 
$
208

 
$
(782
)
 
$
901

 
$
(315
)
 
$
586

Less: reclassification adjustment of realized capital gains and losses
 
(106
)
 
22

 
(84
)
 
174

 
(61
)
 
113

Unrealized net capital gains and losses
 
(884
)
 
186

 
(698
)
 
727

 
(254
)
 
473

Unrealized foreign currency translation adjustments
 
(14
)
 
3

 
(11
)
 
12

 
(4
)
 
8

Unrecognized pension and other postretirement benefit cost arising during the period
 
4

 
(1
)
 
3

 
(3
)
 
2

 
(1
)
Less: reclassification adjustment of net periodic cost recognized in operating costs and expenses
 
(53
)
 
11

 
(42
)
 
(58
)
 
20

 
(38
)
Unrecognized pension and other postretirement benefit cost
 
57

 
(12
)
 
45

 
55

 
(18
)
 
37

Other comprehensive (loss) income
 
$
(841
)
 
$
177

 
$
(664
)
 
$
794

 
$
(276
)
 
$
518