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Investments (Tables) | 6 Months Ended
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Jun. 30, 2018
Investments [Abstract] |
Net Realized Capital Gains (Losses) |
Net Realized Capital Gains
| Three Months Ended June 30, | Six Months Ended June 30,
(Before tax) | 2018 | 2017 | 2018 | 2017
Gross gains on sales | $ | 46 |  | $ | 77 |  | $ | 65 |  | $ | 138 |
Gross losses on sales | (31 | ) | (22 | ) | (88 | ) | (68 | )
Equity securities [1] | 26 |  | — |  | 42 |  | — |
Net OTTI losses recognized in earnings | — |  | (2 | ) | — |  | (3 | )
Transactional foreign currency revaluation | — |  | 8 |  | 1 |  | 14 |
Non-qualifying foreign currency derivatives | 4 |  | (7 | ) | 1 |  | (14 | )
Other, net [2] | 7 |  | 1 |  | 1 |  | 12 |
Net realized capital gains | $ | 52 |  | $ | 55 |  | $ | 22 |  | $ | 79 |
[1] | Effective January 1, 2018, with adoption of new accounting guidance for equity securities at fair value, includes all changes in fair value and trading gains and losses for equity securities.
[2] | Includes gains (losses) on non-qualifying derivatives, excluding foreign currency derivatives, of $8 and $1, respectively, for the three months ended June 30, 2018 and 2017. For the six months ended June 30, 2018 and 2017, the non-qualifying derivatives, excluding foreign currency derivatives were $(2) and $8, respectively.
Impairments |
Cumulative Credit Impairments
| Three Months Ended June 30, | Six Months Ended June 30,
(Before tax) | 2018 | 2017 | 2018 | 2017
Balance as of beginning of period | $ | (21 | ) | $ | (99 | ) | $ | (25 | ) | $ | (110 | )
Additions for credit impairments recognized on [1]: |  |  |  |
Securities not previously impaired | — |  | (1 | ) | — |  | (1 | )
Securities previously impaired | — |  | — |  | — |  | (1 | )
Reductions for credit impairments previously recognized on: |  |  |  |
Securities that matured or were sold during the period | 1 |  | 1 |  | 5 |  | 9 |
Securities due to an increase in expected cash flows | — |  | 5 |  | — |  | 9 |
Balance as of end of period | $ | (20 | ) | $ | (94 | ) | $ | (20 | ) | $ | (94 | )
[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 June 30, | Six Months Ended June 30,
| 2018 | 2017 | 2018 | 2017
Credit impairments | $ | — |  | $ | 1 |  | $ | — |  | $ | 2 |
Intent-to-sell impairments | — |  | — |  | — |  | — |
Impairments on equity securities | — |  | 1 |  | — |  | 1 |
Total impairments | $ | — |  | $ | 2 |  | $ | — |  | $ | 3 |
Schedule of Available-for-sale Securities | Available-for-Sale Securities
AFS Securities by Type
| June 30, 2018 | December 31, 2017
| 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 | $ | 993 |  | $ | 4 |  | $ | (3 | ) | $ | 994 |  | $ | — |  | $ | 1,119 |  | $ | 9 |  | $ | (2 | ) | $ | 1,126 |  | $ | — |
CDOs | 1,091 |  | 1 |  | (3 | ) | 1,089 |  | — |  | 1,257 |  | 3 |  | — |  | 1,260 |  | — |
CMBS | 3,536 |  | 31 |  | (73 | ) | 3,494 |  | (4 | ) | 3,304 |  | 58 |  | (26 | ) | 3,336 |  | (5 | )
Corporate | 13,493 |  | 192 |  | (336 | ) | 13,349 |  | — |  | 12,370 |  | 490 |  | (56 | ) | 12,804 |  | — |
Foreign govt./govt. agencies | 1,149 |  | 12 |  | (28 | ) | 1,133 |  | — |  | 1,071 |  | 43 |  | (4 | ) | 1,110 |  | — |
Municipal | 10,678 |  | 508 |  | (44 | ) | 11,142 |  | — |  | 11,743 |  | 754 |  | (12 | ) | 12,485 |  | — |
RMBS | 3,200 |  | 48 |  | (41 | ) | 3,207 |  | — |  | 2,985 |  | 63 |  | (4 | ) | 3,044 |  | — |
U.S. Treasuries | 1,773 |  | 35 |  | (22 | ) | 1,786 |  | — |  | 1,763 |  | 46 |  | (10 | ) | 1,799 |  | — |
Total fixed maturities, AFS | 35,913 |  | 831 |  | (550 | ) | 36,194 |  | (4 | ) | 35,612 |  | 1,466 |  | (114 | ) | 36,964 |  | (5 | )
Equity securities, AFS [2] |  |  |  |  |  |  |  |  |  |  | 907 |  | 121 |  | (16 | ) | 1,012 |  | — |
Total AFS securities | $ | 35,913 |  | $ | 831 |  | $ | (550 | ) | $ | 36,194 |  | $ | (4 | ) | $ | 36,519 |  | $ | 1,587 |  | $ | (130 | ) | $ | 37,976 |  | $ | (5 | )
[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 in AOCI as of June 30, 2018 and December 31, 2017.
[2] | Effective January 1, 2018, with the adoption of new accounting standards for financial instruments, equity securities, AFS were reclassified to equity securities at fair value and are excluded from the table above as of June 30, 2018.
Fixed maturities, AFS, by Contractual Maturity Year
| June 30, 2018 | December 31, 2017
| Amortized Cost | Fair Value | Amortized Cost | Fair Value
One year or less | $ | 1,321 |  | $ | 1,326 |  | $ | 1,507 |  | $ | 1,513 |
Over one year through five years | 5,955 |  | 5,980 |  | 5,007 |  | 5,119 |
Over five years through ten years | 6,614 |  | 6,546 |  | 6,505 |  | 6,700 |
Over ten years | 13,203 |  | 13,558 |  | 13,928 |  | 14,866 |
Subtotal | 27,093 |  | 27,410 |  | 26,947 |  | 28,198 |
Mortgage-backed and asset-backed securities | 8,820 |  | 8,784 |  | 8,665 |  | 8,766 |
Total fixed maturities, AFS | $ | 35,913 |  | $ | 36,194 |  | $ | 35,612 |  | $ | 36,964 |
Investments by Contractual Maturity Year |
Fixed maturities, AFS, by Contractual Maturity Year
| June 30, 2018 | December 31, 2017
| Amortized Cost | Fair Value | Amortized Cost | Fair Value
One year or less | $ | 1,321 |  | $ | 1,326 |  | $ | 1,507 |  | $ | 1,513 |
Over one year through five years | 5,955 |  | 5,980 |  | 5,007 |  | 5,119 |
Over five years through ten years | 6,614 |  | 6,546 |  | 6,505 |  | 6,700 |
Over ten years | 13,203 |  | 13,558 |  | 13,928 |  | 14,866 |
Subtotal | 27,093 |  | 27,410 |  | 26,947 |  | 28,198 |
Mortgage-backed and asset-backed securities | 8,820 |  | 8,784 |  | 8,665 |  | 8,766 |
Total fixed maturities, AFS | $ | 35,913 |  | $ | 36,194 |  | $ | 35,612 |  | $ | 36,964 |
Unrealized Loss on Investments |
Unrealized Loss Aging for AFS Securities by Type and Length of Time as of June 30, 2018
| 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 | $ | 477 |  | $ | 475 |  | $ | (2 | ) | $ | 32 |  | $ | 31 |  | $ | (1 | ) | $ | 509 |  | $ | 506 |  | $ | (3 | )
CDOs | 556 |  | 553 |  | (3 | ) | — |  | — |  | — |  | 556 |  | 553 |  | (3 | )
CMBS | 2,002 |  | 1,947 |  | (55 | ) | 251 |  | 233 |  | (18 | ) | 2,253 |  | 2,180 |  | (73 | )
Corporate | 7,467 |  | 7,213 |  | (254 | ) | 1,035 |  | 953 |  | (82 | ) | 8,502 |  | 8,166 |  | (336 | )
Foreign govt./govt. agencies | 676 |  | 652 |  | (24 | ) | 61 |  | 57 |  | (4 | ) | 737 |  | 709 |  | (28 | )
Municipal | 1,845 |  | 1,817 |  | (28 | ) | 225 |  | 209 |  | (16 | ) | 2,070 |  | 2,026 |  | (44 | )
RMBS | 1,751 |  | 1,716 |  | (35 | ) | 137 |  | 131 |  | (6 | ) | 1,888 |  | 1,847 |  | (41 | )
U.S. Treasuries | 741 |  | 728 |  | (13 | ) | 240 |  | 231 |  | (9 | ) | 981 |  | 959 |  | (22 | )
Total fixed maturities, AFS in an unrealized loss position | 15,515 |  | 15,101 |  | (414 | ) | 1,981 |  | 1,845 |  | (136 | ) | 17,496 |  | 16,946 |  | (550 | )
Unrealized Loss Aging for AFS Securities by Type and Length of Time as of December 31, 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 | $ | 461 |  | $ | 460 |  | $ | (1 | ) | $ | 30 |  | $ | 29 |  | $ | (1 | ) | $ | 491 |  | $ | 489 |  | $ | (2 | )
CDOs | 359 |  | 359 |  | — |  | 1 |  | 1 |  | — |  | 360 |  | 360 |  | — |
CMBS | 1,178 |  | 1,167 |  | (11 | ) | 243 |  | 228 |  | (15 | ) | 1,421 |  | 1,395 |  | (26 | )
Corporate | 2,322 |  | 2,302 |  | (20 | ) | 1,064 |  | 1,028 |  | (36 | ) | 3,386 |  | 3,330 |  | (56 | )
Foreign govt./govt. agencies | 244 |  | 242 |  | (2 | ) | 51 |  | 49 |  | (2 | ) | 295 |  | 291 |  | (4 | )
Municipal | 511 |  | 507 |  | (4 | ) | 236 |  | 228 |  | (8 | ) | 747 |  | 735 |  | (12 | )
RMBS | 889 |  | 887 |  | (2 | ) | 137 |  | 135 |  | (2 | ) | 1,026 |  | 1,022 |  | (4 | )
U.S. Treasuries | 658 |  | 652 |  | (6 | ) | 254 |  | 250 |  | (4 | ) | 912 |  | 902 |  | (10 | )
Total fixed maturities, AFS | 6,622 |  | 6,576 |  | (46 | ) | 2,016 |  | 1,948 |  | (68 | ) | 8,638 |  | 8,524 |  | (114 | )
Equity securities, AFS [1] | 176 |  | 163 |  | (13 | ) | 24 |  | 21 |  | (3 | ) | 200 |  | 184 |  | (16 | )
Total securities in an unrealized loss position | $ | 6,798 |  | $ | 6,739 |  | $ | (59 | ) | $ | 2,040 |  | $ | 1,969 |  | $ | (71 | ) | $ | 8,838 |  | $ | 8,708 |  | $ | (130 | )
[1]Effective January 1, 2018, with the adoption of new accounting guidance for financial instruments, equity securities, AFS were reclassified to equity securities at fair value and are excluded from the table above as of June 30, 2018.
Schedule of Valuation Allowance for Impairment of Recognized Servicing Assets [Table Text Block] |
Valuation Allowance Activity
| 2018 | 2017
Balance, as of January 1 | $ | (1 | ) | $ | — |
Reversals | — |  | — |
Deductions | — |  | — |
Balance, as of June 30 | $ | (1 | ) | $ | — |
Loans Credit Quality |
Commercial Mortgage Loans Credit Quality
| June 30, 2018 | December 31, 2017
Loan-to-value | Carrying Value | Avg. Debt-Service Coverage Ratio | Carrying Value | Avg. Debt-Service Coverage Ratio
Greater than 80% | $ | — |  | 0.00x | $ | 18 |  | 1.27x
65% - 80% | 361 |  | 1.63x | 265 |  | 1.95x
Less than 65% | 2,994 |  | 2.76x | 2,892 |  | 2.76x
Total commercial mortgage loans | $ | 3,355 |  | 2.68x | $ | 3,175 |  | 2.69x
Mortgage Loans |
Commercial Mortgage Loans Credit Quality
| June 30, 2018 | December 31, 2017
Loan-to-value | Carrying Value | Avg. Debt-Service Coverage Ratio | Carrying Value | Avg. Debt-Service Coverage Ratio
Greater than 80% | $ | — |  | 0.00x | $ | 18 |  | 1.27x
65% - 80% | 361 |  | 1.63x | 265 |  | 1.95x
Less than 65% | 2,994 |  | 2.76x | 2,892 |  | 2.76x
Total commercial mortgage loans | $ | 3,355 |  | 2.68x | $ | 3,175 |  | 2.69x
Mortgage Loans by Region
| June 30, 2018 | December 31, 2017
| Carrying Value | Percent of Total | Carrying Value | Percent of Total
East North Central | $ | 251 |  | 7.5 | % | $ | 251 |  | 7.9 | %
Middle Atlantic | 271 |  | 8.1 | % | 272 |  | 8.6 | %
Mountain | 31 |  | 0.9 | % | 31 |  | 1.0 | %
New England | 291 |  | 8.7 | % | 293 |  | 9.2 | %
Pacific | 803 |  | 23.9 | % | 760 |  | 23.9 | %
South Atlantic | 691 |  | 20.6 | % | 710 |  | 22.4 | %
West North Central | 148 |  | 4.4 | % | 149 |  | 4.7 | %
West South Central | 383 |  | 11.4 | % | 278 |  | 8.7 | %
Other [1] | 486 |  | 14.5 | % | 431 |  | 13.6 | %
Total mortgage loans | $ | 3,355 |  | 100.0 | % | $ | 3,175 |  | 100.0 | %
[1] | Primarily represents loans collateralized by multiple properties in various regions.
Mortgage Loans by Property Type
| June 30, 2018 | December 31, 2017
| Carrying Value | Percent of Total | Carrying Value | Percent of Total
Commercial |  |  |  |
Industrial | $ | 964 |  | 28.7 | % | $ | 817 |  | 25.7 | %
Multifamily | 1,022 |  | 30.5 | % | 1,006 |  | 31.7 | %
Office | 762 |  | 22.7 | % | 751 |  | 23.7 | %
Retail | 363 |  | 10.8 | % | 367 |  | 11.5 | %
Other | 244 |  | 7.3 | % | 234 |  | 7.4 | %
Total mortgage loans | $ | 3,355 |  | 100.0 | % | $ | 3,175 |  | 100.0 | %
Offsetting Liabilities |
Securities Lending and Repurchase Agreements
| June 30, 2018 | December 31, 2017
| Fair Value | Fair Value |
Securities Lending Transactions: |  |
Gross amount of securities on loan | $ | 687 |  | $ | 922 |
Gross amount of associated liability for collateral received [1] | $ | 704 |  | $ | 945 |
Repurchase agreements: |  |
Gross amount of recognized liabilities for repurchase agreements | $ | 165 |  | $ | 174 |
Gross amount of collateral pledged related to repurchase agreements [2] | $ | 170 |  | $ | 176 |
[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 $9 and $0 million which are excluded from the Company's Condensed Consolidated Balance Sheets as of June 30, 2018 and December 31, 2017, respectively.
[2] | Collateral pledged is included within fixed maturities, AFS and short term investments in the Company's Condensed Consolidated Balance Sheets.
Offsetting Derivative Assets and Liabilities
| (i) |  | (ii) |  | (iii) = (i) - (ii) | (iv) |  | (v) = (iii) - (iv)
|  |  |  |  | Net Amounts Presented in the Statement of Financial Position |  | Collateral Disallowed for Offset in the Statement of Financial Position |  |
| Gross Amounts of Recognized Assets (Liabilities) [1] |  | Gross Amounts Offset in the Statement of Financial Position |  | Derivative Assets [2] (Liabilities) [3] |  | Accrued Interest and Cash Collateral (Received) [4] Pledged [3] |  | Financial Collateral (Received) Pledged [5] |  | Net Amount
As of June 30, 2018 |  |  |  |  |  |  |  |  |  |  |
Other investments | $ | 27 |  |  | $ | 22 |  |  | $ | 15 |  |  | $ | (10 | ) |  | $ | 3 |  |  | $ | 2 |
Other liabilities | $ | (87 | ) |  | $ | (11 | ) |  | $ | (75 | ) |  | $ | (1 | ) |  | $ | (68 | ) |  | $ | (8 | )
As of December 31, 2017 |  |  |  |  |  |  |  |  |  |  |
Other investments | $ | 25 |  |  | $ | 22 |  |  | $ | 10 |  |  | $ | (7 | ) |  | $ | 1 |  |  | $ | 2 |
Other liabilities | $ | (115 | ) |  | $ | (10 | ) |  | $ | (100 | ) |  | $ | (5 | ) |  | $ | (96 | ) |  | $ | (9 | )
[1] | Certain prior year amounts have been restated to conform to the current year presentation for OTC-cleared derivatives.
[2] | Included in other investments in the Company's Condensed Consolidated Balance Sheets.
[3] | Included in other liabilities in the Company's Condensed Consolidated Balance Sheets and is limited to the net derivative payable associated with each counterparty.
[4] | Included in other investments in the Company's Condensed Consolidated Balance Sheets and is limited to the net derivative receivable associated with each counterparty.
[5] | Excludes collateral associated with exchange-traded derivative instruments.

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