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Investment Holding Level 3 (Tables)
 9 Months Ended
Sep. 30, 2017
Schedule of Investments [Abstract]  
Realized Gain (Loss) on Investments [Table Text Block]
Net Realized Capital Gains (Losses)
 
Three Months Ended September 30,
Nine Months Ended September 30,
(Before tax)
2017
2016
2017
2016
Gross gains on sales
$
80

$
114

$
332

$
328

Gross losses on sales
(26
)
(24
)
(132
)
(157
)
Net OTTI losses recognized in earnings
(2
)
(14
)
(17
)
(44
)
Valuation allowances on mortgage loans
—

—

2

—

Results of variable annuity hedge program
 

 


GMWB derivatives, net
15

6

53

(8
)
Macro hedge program
(65
)
(64
)
(189
)
(98
)
Total results of variable annuity hedge program
(50
)
(58
)
(136
)
(106
)
Transactional foreign currency revaluation
2

(13
)
2

(144
)
Non-qualifying foreign currency derivatives
(3
)
17

(9
)
138

Other, net [1]
(4
)
(39
)
10

(134
)
Net realized capital gains (losses)
$
(3
)
$
(17
)
$
52

$
(119
)

[1]
Includes non-qualifying derivatives, excluding variable annuity hedge program and foreign currency derivatives, of $(5) and $6, respectively for the three months ended September 30, 2017 and 2016. For the nine months ended September 30, 2017 and 2016, the non-qualifying derivatives, excluding variable annuity hedge program and foreign currency derivatives were $0 and $(50), respectively.
Net realized capital gains and losses from investment sales are reported as a component of revenues and are determined on a specific identification basis. Before tax, net gains (and losses) on sales and impairments previously reported as unrealized gains (or losses) in AOCI were $52 and $183 for the three and nine months ended September 30, 2017, and $77 and $128 for the three and nine months ended September 30, 2016. Proceeds from sales of AFS securities totaled $4.3 billion and $17.3 billion for the three and nine months ended September 30, 2017, and $4.3 billion and $13.3 billion for the three and nine months ended September 30, 2016.
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block]
Cumulative Credit Impairments
 
Three Months Ended September 30,
Nine Months Ended September 30,
(Before tax)
2017
2016
2017
2016
Balance as of beginning of period
$
(236
)
$
(293
)
$
(280
)
$
(324
)
Additions for credit impairments recognized on [1]:
 
 
 
 
Securities not previously impaired
—

(4
)
(1
)
(25
)
Securities previously impaired
(1
)
(9
)
(14
)
(11
)
Reductions for credit impairments previously recognized on:
 
 
 
 
Securities that matured or were sold during the period
2

14

43

50

Securities due to an increase in expected cash flows
6

5

23

23

Balance as of end of period
$
(229
)
$
(287
)
$
(229
)
$
(287
)
[1]
These additions are included in the net OTTI losses recognized in earnings in the Condensed Consolidated Statements of Operations.
Impairments in Earnings by Type
 
Three Months Ended September 30,
Nine Months Ended September 30,
 
2017
2016
2017
2016
Credit impairments
$
1

$
13

$
15

$
36

Intent-to-sell impairments
—

—

—

3

Impairments on equity securities
1

1

2

5

Total impairments
$
2

$
14

$
17

$
44
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
Available-for-Sale Securities
AFS Securities by Type
 
September 30, 2017
December 31, 2016
 
Cost or
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair
Value
Non-Credit
OTTI [1]
Cost or
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair
Value
Non-Credit
OTTI [1]
ABS
$
2,300

$
20

$
(15
)
$
2,305

$
—

$
2,396

$
17

$
(31
)
$
2,382

$
—

CDOs
2,364

33

(2
)
2,395

—

1,853

67

(4
)
1,916

—

CMBS
5,034

123

(37
)
5,120

(6
)
4,907

97

(68
)
4,936

(6
)
Corporate
23,925

1,901

(80
)
25,746

—

24,380

1,510

(224
)
25,666

—

Foreign govt./govt. agencies
1,300

71

(6
)
1,365

—

1,164

33

(26
)
1,171

—

Municipal
11,585

869

(19
)
12,435

—

10,825

732

(71
)
11,486

—

RMBS
4,083

127

(5
)
4,205

—

4,738

66

(37
)
4,767

—

U.S. Treasuries
3,887

224

(13
)
4,098

—

3,542

182

(45
)
3,679

—

Total fixed maturities, AFS
54,478

3,368

(177
)
57,669

(6
)
53,805

2,704

(506
)
56,003

(6
)
Equity securities, AFS
1,010

130

(28
)
1,112

—

1,020

96

(19
)
1,097

—

Total AFS securities
$
55,488

$
3,498

$
(205
)
$
58,781

$
(6
)
$
54,825

$
2,800

$
(525
)
$
57,100

$
(6
)
[1]
Represents the amount of cumulative non-credit OTTI losses recognized in OCI on securities that also had credit impairments. These losses are included in gross unrealized losses as of September 30, 2017, and December 31, 2016.
Fixed maturities, AFS, by Contractual Maturity Year
 
September 30, 2017
December 31, 2016

Amortized Cost
Fair Value
Amortized Cost
Fair Value
One year or less
$
2,289

$
2,305

$
1,896

$
1,912

Over one year through five years
8,896

9,168

9,015

9,289

Over five years through ten years
8,975

9,352

9,038

9,245

Over ten years
20,537

22,819

19,962

21,556

Subtotal
40,697

43,644

39,911

42,002

Mortgage-backed and asset-backed securities
13,781

14,025

13,894

14,001

Total fixed maturities, AFS
$
54,478

$
57,669

$
53,805

$
56,003
Investments Classified by Contractual Maturity Date [Table Text Block]
Fixed maturities, AFS, by Contractual Maturity Year
 
September 30, 2017
December 31, 2016

Amortized Cost
Fair Value
Amortized Cost
Fair Value
One year or less
$
2,289

$
2,305

$
1,896

$
1,912

Over one year through five years
8,896

9,168

9,015

9,289

Over five years through ten years
8,975

9,352

9,038

9,245

Over ten years
20,537

22,819

19,962

21,556

Subtotal
40,697

43,644

39,911

42,002

Mortgage-backed and asset-backed securities
13,781

14,025

13,894

14,001

Total fixed maturities, AFS
$
54,478

$
57,669

$
53,805

$
56,003


Estimated maturities may differ from contractual maturities due to security call or prepayment provisions. Due to the potential for variability in payment speeds (i.e. prepayments or extensions), mortgage-backed and asset-backed securities are not categorized by contractual maturity.
Schedule of Unrealized Loss on Investments [Table Text Block]
Unrealized Loss Aging for AFS Securities by Type and Length of Time as of September 30, 2017
 
Less Than 12 Months
12 Months or More
Total
 
Amortized Cost
Fair Value
Unrealized Losses
Amortized Cost
Fair Value
Unrealized Losses
Amortized Cost
Fair Value
Unrealized Losses
ABS
$
523

$
522

$
(1
)
$
230

$
216

$
(14
)
$
753

$
738

$
(15
)
CDOs
1,138

1,136

(2
)
145

145

—

1,283

1,281

(2
)
CMBS
1,490

1,472

(18
)
288

269

(19
)
1,778

1,741

(37
)
Corporate
2,317

2,289

(28
)
1,447

1,395

(52
)
3,764

3,684

(80
)
Foreign govt./govt. agencies
170

167

(3
)
59

56

(3
)
229

223

(6
)
Municipal
783

774

(9
)
156

146

(10
)
939

920

(19
)
RMBS
363

359

(4
)
60

59

(1
)
423

418

(5
)
U.S. Treasuries
1,716

1,705

(11
)
30

28

(2
)
1,746

1,733

(13
)
Total fixed maturities, AFS
8,500

8,424

(76
)
2,415

2,314

(101
)
10,915

10,738

(177
)
Equity securities, AFS
195

170

(25
)
29

26

(3
)
224

196

(28
)
Total securities in an unrealized loss position
$
8,695

$
8,594

$
(101
)
$
2,444

$
2,340

$
(104
)
$
11,139

$
10,934

$
(205
)
Unrealized Loss Aging for AFS Securities by Type and Length of Time as of December 31, 2016
 
Less Than 12 Months
12 Months or More
Total
 
Amortized Cost
Fair Value
Unrealized Losses
Amortized Cost
Fair Value
Unrealized Losses
Amortized Cost
Fair Value
Unrealized Losses
ABS
$
582

$
579

$
(3
)
$
368

$
340

$
(28
)
$
950

$
919

$
(31
)
CDOs
641

640

(1
)
370

367

(3
)
1,011

1,007

(4
)
CMBS
2,076

2,027

(49
)
293

274

(19
)
2,369

2,301

(68
)
Corporate
5,418

5,248

(170
)
835

781

(54
)
6,253

6,029

(224
)
Foreign govt./govt. agencies
573

550

(23
)
27

24

(3
)
600

574

(26
)
Municipal
1,567

1,498

(69
)
43

41

(2
)
1,610

1,539

(71
)
RMBS
1,655

1,624

(31
)
591

585

(6
)
2,246

2,209

(37
)
U.S. Treasuries
1,432

1,387

(45
)
—

—

—

1,432

1,387

(45
)
Total fixed maturities, AFS
13,944

13,553

(391
)
2,527

2,412

(115
)
16,471

15,965

(506
)
Equity securities, AFS
330

315

(15
)
38

34

(4
)
368

349

(19
)
Total securities in an unrealized loss position
$
14,274

$
13,868

$
(406
)
$
2,565

$
2,446

$
(119
)
$
16,839

$
16,314

$
(525
)
Mortgage Loans on Real Estate, by Loan Disclosure [Text Block]
Mortgage Loans
Mortgage Loan Valuation Allowances
Commercial mortgage loans are considered to be impaired when management estimates that, based upon current information and events, it is probable that the Company will be unable to collect amounts due according to the contractual terms of the loan agreement. The Company reviews mortgage loans on a quarterly basis to identify potential credit losses. Among other factors, management reviews current and projected macroeconomic trends, such as unemployment rates and property-specific factors such as rental rates, occupancy levels, LTV ratios and debt service coverage ratios (“DSCR”). In addition, the Company considers historical, current and projected delinquency rates and property values. Estimates of collectibility require the use of significant management judgment and include the probability and timing of borrower default and loss severity estimates. In addition, cash flow projections may change based upon new information about the borrower's ability to pay and/or the value of underlying collateral such as changes in projected property value estimates.
For mortgage loans that are deemed impaired, a valuation allowance is established for the difference between the carrying amount and estimated fair value. The mortgage loan's estimated fair value is most frequently the Company's share of the fair value of the collateral but may also be the Company’s share of either (a) the present value of the expected future cash flows discounted at the loan’s effective interest rate or (b) the loan’s observable market price. A valuation allowance may be recorded for an individual loan or for a group of loans that have an LTV ratio of 90% or greater, a low DSCR or have other lower credit quality characteristics. Changes in valuation allowances are recorded in net realized capital gains and losses. Interest income on impaired loans is accrued to the extent it is deemed collectible and the borrowers continue to make payments under the original or restructured loan terms. The Company stops accruing interest income on loans when it is probable that the Company will not receive interest and principal payments according to the contractual terms of the loan agreement. The Company resumes accruing interest income when it determines that sufficient collateral exists to satisfy the full amount of the loan principal and interest payments and when it is probable cash will be received in the foreseeable future. Interest income on defaulted loans is recognized when received.
Schedule of Valuation Allowance for Impairment of Recognized Servicing Assets [Table Text Block]
The following table presents the activity within the Company’s valuation allowance for mortgage loans. These loans have been evaluated both individually and collectively for impairment. Loans evaluated collectively for impairment are immaterial.
Valuation Allowance Activity
 
2017
2016
Balance, as of January 1
$
(19
)
$
(23
)
(Additions)/Reversals
(2
)
—

Deductions
20

4

Balance, as of September 30
$
(1
)
$
(19
)
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Mortgage Loans by Property Type
 
September 30, 2017
December 31, 2016
 
Carrying Value
Percent of Total
Carrying
Value
Percent of Total
Commercial
 
 
 
 
Industrial
$
1,495

24.7
%
$
1,468

25.7
%
Lodging
25

0.4
%
25

0.4
%
Multifamily
1,699

28.0
%
1,365

24.0
%
Office
1,436

23.7
%
1,361

23.9
%
Retail
967

16.0
%
1,036

18.2
%
Other
436

7.2
%
442

7.8
%
Total mortgage loans
$
6,058

100.0
%
$
5,697

100.0
%
Commercial Mortgage Loans Credit Quality
 
September 30, 2017
December 31, 2016
Loan-to-value
Carrying Value
Avg. Debt-Service Coverage Ratio
Carrying Value
Avg. Debt-Service Coverage Ratio
Greater than 80%
$
5

1.36x
$
20

0.59x
65% - 80%
371

2.07x
568

2.17x
Less than 65%
5,682

2.71x
5,109

2.78x
Total commercial mortgage loans
$
6,058

2.67x
$
5,697

2.70x
Mortgage Loans by Region
 
September 30, 2017
December 31, 2016
 
Carrying Value
Percent of Total
Carrying Value
Percent of Total
East North Central
$
305

5.0
%
$
293

5.1
%
East South Central
14

0.2
%
14

0.2
%
Middle Atlantic
592

9.8
%
534

9.4
%
Mountain
85

1.4
%
61

1.1
%
New England
386

6.4
%
345

6.1
%
Pacific
1,604

26.5
%
1,609

28.3
%
South Atlantic
1,296

21.4
%
1,198

21.0
%
West North Central
149

2.5
%
40

0.7
%
West South Central
474

7.8
%
338

5.9
%
Other [1]
1,153

19.0
%
1,265

22.2
%
Total mortgage loans
$
6,058

100.0
%
$
5,697

100.0
%
[1]
Primarily represents loans collateralized by multiple properties in various regions.
Schedule of Variable Interest Entities [Table Text Block]
Consolidated VIEs
As of September 30, 2017, the Company did not hold any securities for which it is the primary beneficiary. As of December 31, 2016, the Company held one CDO for which it was the primary beneficiary. The CDO represented a structured investment vehicle for which the Company had a controlling financial interest. As of December 31, 2016 the Company held total CDO assets of $5 included in cash with an associated liability of $5 included in other liabilities on the Company's Condensed Consolidated Balance Sheets. The Company did not have any additional exposure to loss associated with this investment.
Schedule of Securities Financing Transactions [Table Text Block]
Securities Lending and Repurchase Agreements
 
September 30, 2017
December 31, 2016
 
Fair Value
Fair Value

Securities Lending Transactions:
 
 
Gross amount of securities on loan
$
1,584

$
488

Gross amount of associated liability for collateral received [1]
$
1,623

$
500

 
 
 
Repurchase agreements:
 
 
Gross amount of recognized liabilities for repurchase agreements
$
520

$
241

Gross amount of collateral pledged related to repurchase agreements [2]
$
524

$
248

[1]
Cash collateral received is reinvested in fixed maturities, AFS and short term investments which are included in the Condensed Consolidated Balance Sheets. Amount includes additional securities collateral received of $10 and $39 million which are excluded from the Company's Condensed Consolidated Balance Sheets as of September 30, 2017 and December 31, 2016, respectively.
[2]
Collateral pledged is included within fixed maturities, AFS and short term investments in the Company's Condensed Consolidated Balance Sheets.