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Deferred Acquisition Costs, Deferred Sales Inducements and Value of Business Acquired
 9 Months Ended
Sep. 30, 2018
Insurance [Abstract]  
Deferred Acquisition Costs, Deferred Sales Inducements, and Value of Business Acquired
6. Deferred Acquisition Costs, Deferred Sales Inducements and Value of Business Acquired

The following represents a rollforward of deferred acquisition costs (DAC), deferred sales inducements (DSI) and value of business acquired (VOBA):
(In millions)
DAC
 
DSI
 
VOBA
 
Total
Balance at December 31, 2017
$
1,354

 
$
520

 
$
1,056

 
$
2,930

Additions
1,791

 
197

 
—

 
1,988

Unlocking
21

 
7

 
54

 
82

Amortization
(151
)
 
(73
)
 
(135
)
 
(359
)
Impact of unrealized investment (gains) losses
126

 
48

 
157

 
331

Balance at September 30, 2018
$
3,141

 
$
699

 
$
1,132

 
$
4,972


(In millions)
DAC
 
DSI
 
VOBA
 
Total
Balance at December 31, 2016
$
1,142

 
$
462

 
$
1,336

 
$
2,940

Additions
371

 
121

 
—

 
492

Unlocking
13

 
4

 
(1
)
 
16

Amortization
(142
)
 
(46
)
 
(121
)
 
(309
)
Impact of unrealized investment (gains) losses
(90
)
 
(36
)
 
(110
)
 
(236
)
Balance at September 30, 2017
$
1,294

 
$
505

 
$
1,104

 
$
2,903