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Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2019
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 (loss) on a pre-tax and after-tax basis are as follows:
($ in millions)
Three months ended March 31,
 
2019
 
2018
 
Pre-
tax
 
Tax
 
After-
tax
 
Pre-
tax
 
Tax
 
After-
tax
Unrealized net holding gains and losses arising during the period, net of related offsets
$
430

 
$
(90
)
 
$
340

 
$
(224
)
 
$
47

 
$
(177
)
Less: reclassification adjustment of realized capital gains and losses
(8
)
 
2

 
(6
)
 
(2
)
 
—

 
(2
)
Unrealized net capital gains and losses
438

 
(92
)
 
346

 
(222
)
 
47

 
(175
)
Unrealized foreign currency translation adjustments
(4
)
 
1

 
(3
)
 
5

 
(1
)
 
4

Other comprehensive income (loss)
$
434

 
$
(91
)
 
$
343

 
$
(217
)
 
$
46

 
$
(171
)