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Variable Annuity and Insurance Guarantees (Tables)
 9 Months Ended
Sep. 30, 2018
Insurance [Abstract]  
Schedule of Variable Annuity Guarantees [Table Text Block] The following table provides information related to variable annuity guarantees for which the Company has established additional liabilities:
Variable Annuity 
Guarantees
by Benefit Type (1)
September 30, 2018
 
December 31, 2017
Total Contract Value
 
Contract Value in Separate Accounts
 
Net Amount
at Risk
 
Weighted Average
Attained Age
Total Contract Value
 
Contract Value in Separate Accounts
 
Net Amount
at Risk
 
Weighted Average
Attained Age
 
(in millions, except age)
GMDB:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Return of premium
$
61,379

 
$
59,441

 
$
12

 
67
 
$
61,418

 
$
59,461

 
$
9

 
66
Five/six-year reset
8,504

 
5,781

 
11

 
66
 
8,870

 
6,149

 
12

 
66
One-year ratchet
6,215

 
5,864

 
19

 
69
 
6,548

 
6,187

 
11

 
69
Five-year ratchet
1,471

 
1,416

 
1

 
65
 
1,563

 
1,506

 
1

 
65
Other
1,126

 
1,107

 
63

 
72
 
1,099

 
1,075

 
50

 
72
Total — GMDB
$
78,695

 
$
73,609

 
$
106

 
67
 
$
79,498

 
$
74,378

 
$
83

 
66
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
GGU death benefit
$
1,105

 
$
1,055

 
$
129

 
70
 
$
1,118

 
$
1,067

 
$
133

 
70
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
GMIB
$
208

 
$
192

 
$
7

 
69
 
$
233

 
$
216

 
$
7

 
69
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
GMWB:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
GMWB
$
2,252

 
$
2,245

 
$
1

 
72
 
$
2,508

 
$
2,500

 
$
1

 
71
GMWB for life
44,871

 
44,776

 
217

 
68
 
44,375

 
44,259

 
129

 
67
Total — GMWB
$
47,123

 
$
47,021

 
$
218

 
68
 
$
46,883

 
$
46,759

 
$
130

 
67
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
GMAB
$
2,762

 
$
2,758

 
$
—

 
59
 
$
3,086

 
$
3,083

 
$
—

 
59
(1) 
Individual variable annuity contracts may have more than one guarantee and therefore may be included in more than one benefit type. Variable annuity contracts for which the death benefit equals the account value are not shown in this table.
Schedule of Net Amount of Risk UL Secondary Guarantees [Table Text Block] The following table provides information related to insurance guarantees for which the Company has established additional liabilities:
 
September 30, 2018
 
December 31, 2017
Net Amount
at Risk
 
Weighted Average Attained Age
Net Amount
at Risk
 
Weighted Average Attained Age
(in millions, except age)
UL secondary guarantees
$
6,499

 
66
 
$
6,460

 
65
Schedule of Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees [Table Text Block] Changes in additional liabilities (contra liabilities) for variable annuity and insurance guarantees were as follows:
 
GMDB & GGU
 
GMIB
 
GMWB (1)
 
GMAB (1)
 
UL
(in millions)
Balance at January 1, 2017
$
16

 
$
8

 
$
1,017

 
$
(24
)
 
$
434

Incurred claims
3

 
—

 
(478
)
 
(49
)
 
59

Paid claims
(3
)
 
(1
)
 
—

 
—

 
(22
)
Balance at September 30, 2017
$
16

 
$
7

 
$
539

 
$
(73
)
 
$
471

 
 
 
 
 
 
 
 
 
 
Balance at January 1, 2018
$
17

 
$
6

 
$
463

 
$
(80
)
 
$
489

Incurred claims
5

 
—

 
(588
)
 
(3
)
 
171

Paid claims
(4
)
 
—

 
—

 
—

 
(19
)
Balance at September 30, 2018
$
18

 
$
6

 
$
(125
)
 
$
(83
)
 
$
641


(1) The incurred claims for GMWB and GMAB include the change in the fair value of the liabilities (contra liabilities) less paid claims.
Schedule of Separate Account Balances by Asset Type [Table Text Block] The following table summarizes the distribution of separate account balances by asset type for variable annuity contracts providing guaranteed benefits:
 
September 30,
2018
 
December 31,
2017
(in millions)
Mutual funds:
 
 
 
Equity
$
44,968

 
$
46,038

Bond
22,846

 
23,529

Other
6,059

 
5,109

Total mutual funds
$
73,873

 
$
74,676