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Deferred Acquisition Costs and Deferred Sales Inducement Costs (Tables)
 9 Months Ended
Sep. 30, 2018
Deferred Charges, Insurers [Abstract]  
Schedule of balances of and changes in DAC [Table Text Block] The balances of and changes in DAC were as follows:
 
2018
 
2017
(in millions)
Balance at January 1
$
2,676

 
$
2,648

Capitalization of acquisition costs
241

 
220

Amortization, excluding the impact of valuation assumptions review
(213
)
 
(201
)
Amortization, impact of valuation assumptions review
33

 
12

Impact of change in net unrealized (gains) losses on securities
95

 
(18
)
Balance at September 30
$
2,832

 
$
2,661
Schedule of balances of and changes in DSIC [Table Text Block] The balances of and changes in DSIC, which is included in other assets, were as follows:
 
2018
 
2017
(in millions)
Balance at January 1
$
276

 
$
302

Capitalization of sales inducement costs
2

 
3

Amortization, excluding the impact of valuation assumptions review
(26
)
 
(26
)
Amortization, impact of valuation assumptions review
—

 
(1
)
Impact of change in net unrealized (gains) losses on securities
16

 
1

Balance at September 30
$
268

 
$
279