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Investments (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2018
Investments [Abstract] |
Net Investment Income | Net Investment Income
| For the years ended December 31,
(Before tax) | 2018 | 2017 | 2016
Fixed maturities [1] | $ | 1,459 |  | $ | 1,303 |  | $ | 1,319 |
Equity securities | 32 |  | 24 |  | 22 |
Mortgage loans | 141 |  | 124 |  | 116 |
Limited partnerships and other alternative investments | 205 |  | 174 |  | 128 |
Other investments [2] | 20 |  | 49 |  | 51 |
Investment expenses | (77 | ) | (71 | ) | (59 | )
Total net investment income | $ | 1,780 |  | $ | 1,603 |  | $ | 1,577 |
[1] | Includes net investment income on short-term investments.
[2] Includes income from derivatives that hedge fixed maturities and qualify for hedge accounting.
Net Realized Capital Gains (Losses) | Net Realized Capital Gains (Losses)
| For the years ended December 31,
(Before tax) | 2018 | 2017 | 2016
Gross gains on sales | $ | 114 |  | $ | 275 |  | $ | 222 |
Gross losses on sales | (172 | ) | (113 | ) | (159 | )
Equity securities [1] | (48 | ) | — |  | — |
Net OTTI losses recognized in earnings | (1 | ) | (8 | ) | (27 | )
Valuation allowances on mortgage loans | — |  | (1 | ) | — |
Transactional foreign currency revaluation | 1 |  | 14 |  | (78 | )
Non-qualifying foreign currency derivatives | 3 |  | (14 | ) | 83 |
Other, net [2] | (9 | ) | 12 |  | (151 | )
Net realized capital gains (losses) | $ | (112 | ) | $ | 165 |  | $ | (110 | )
[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 $(15), $8, and $(9), respectively for 2018, 2017 and 2016. Also included for the year ended December 31, 2016, is a loss related to the write-down of investments in solar energy partnerships, which generated tax benefits, and a loss related to the sale of the Company's U.K. property and casualty run-off subsidiaries.
Sales of AFS Securities | Sales of AFS Securities
| For the years ended December 31,
| 2018 | 2017 | 2016
Fixed maturities, AFS |  |  |
Sale proceeds | $ | 21,327 |  | $ | 17,614 |  | $ | 9,984 |
Gross gains | 90 |  | 204 |  | 196 |
Gross losses | (169 | ) | (90 | ) | (138 | )
Equity securities, AFS |  |  |
Sale proceeds |  | $ | 607 |  | $ | 359 |
Gross gains |  | 69 |  | 26 |
Gross losses |  | (23 | ) | (20 | )
Impairments | Impairments in Earnings by Type
| For the years ended December 31,
| 2018 | 2017 | 2016
Credit impairments | $ | 1 |  | $ | 2 |  | $ | 21 |
Impairments on equity securities |  | 6 |  | 4 |
Intent-to-sell impairments | — |  | — |  | 2 |
Total impairments | $ | 1 |  | $ | 8 |  | $ | 27 |
Cumulative Credit Impairments
| For the years ended December 31,
(Before tax) | 2018 | 2017 | 2016
Balance as of beginning of period | $ | (25 | ) | $ | (110 | ) | $ | (113 | )
Additions for credit impairments recognized on [1]: |  |  |
Securities not previously impaired | — |  | (1 | ) | (16 | )
Securities previously impaired | (1 | ) | (1 | ) | (5 | )
Reductions for credit impairments previously recognized on: |  |  |
Securities that matured or were sold during the period | 7 |  | 76 |  | 15 |
Securities due to an increase in expected cash flows | — |  | 11 |  | 9 |
Balance as of end of period | $ | (19 | ) | $ | (25 | ) | $ | (110 | )
[1] These additions are included in the net OTTI losses recognized in earnings in the Consolidated Statements of Operations.
Schedule of Available-for-sale Securities | AFS Securities by Type
| December 31, 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 | $ | 1,272 |  | $ | 5 |  | $ | (1 | ) | $ | 1,276 |  | $ | — |  |  | $ | 1,119 |  | $ | 9 |  | $ | (2 | ) | $ | 1,126 |  | $ | — |
CLOs | 1,455 |  | 2 |  | (20 | ) | 1,437 |  | — |  |  | 1,257 |  | 3 |  | — |  | 1,260 |  | — |
CMBS | 3,581 |  | 35 |  | (64 | ) | 3,552 |  | (5 | ) |  | 3,304 |  | 58 |  | (26 | ) | 3,336 |  | (5 | )
Corporate | 13,696 |  | 148 |  | (446 | ) | 13,398 |  | — |  |  | 12,370 |  | 490 |  | (56 | ) | 12,804 |  | — |
Foreign govt./govt. agencies | 866 |  | 7 |  | (26 | ) | 847 |  | — |  |  | 1,071 |  | 43 |  | (4 | ) | 1,110 |  | — |
Municipal | 9,972 |  | 421 |  | (47 | ) | 10,346 |  | — |  |  | 11,743 |  | 754 |  | (12 | ) | 12,485 |  | — |
RMBS | 3,270 |  | 44 |  | (35 | ) | 3,279 |  | — |  |  | 2,985 |  | 63 |  | (4 | ) | 3,044 |  | — |
U.S. Treasuries | 1,491 |  | 41 |  | (15 | ) | 1,517 |  | — |  |  | 1,763 |  | 46 |  | (10 | ) | 1,799 |  | — |
Total fixed maturities, AFS | 35,603 |  | 703 |  | (654 | ) | 35,652 |  | (5 | ) |  | 35,612 |  | 1,466 |  | (114 | ) | 36,964 |  | (5 | )
Equity securities, AFS [2] |  |  |  |  |  |  |  |  |  |  |  | 907 |  | 121 |  | (16 | ) | 1,012 |  | — |
Total AFS securities | $ | 35,603 |  | $ | 703 |  | $ | (654 | ) | $ | 35,652 |  | $ | (5 | ) |  | $ | 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 as of December 31, 2018 and 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 December 31, 2018.
Investments by Contractual Maturity Year | Fixed maturities, AFS, by Contractual Maturity Year
| December 31, 2018 |  | December 31, 2017
| Amortized Cost | Fair Value |  | Amortized Cost | Fair Value
One year or less | $ | 999 |  | $ | 1,002 |  |  | $ | 1,507 |  | $ | 1,513 |
Over one year through five years | 5,786 |  | 5,791 |  |  | 5,007 |  | 5,119 |
Over five years through ten years | 6,611 |  | 6,495 |  |  | 6,505 |  | 6,700 |
Over ten years | 12,629 |  | 12,820 |  |  | 13,928 |  | 14,866 |
Subtotal | 26,025 |  | 26,108 |  |  | 26,947 |  | 28,198 |
Mortgage-backed and asset-backed securities | 9,578 |  | 9,544 |  |  | 8,665 |  | 8,766 |
Total fixed maturities, AFS | $ | 35,603 |  | $ | 35,652 |  |  | $ | 35,612 |  | $ | 36,964 |
Unrealized Loss on Investments | Unrealized Losses on AFS Securities Unrealized Loss Aging for AFS Securities by Type and Length of Time as of December 31, 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 | $ | 566 |  | $ | 566 |  | $ | — |  |  | $ | 113 |  | $ | 112 |  | $ | (1 | ) |  | $ | 679 |  | $ | 678 |  | $ | (1 | )
CLOs | 1,358 |  | 1,338 |  | (20 | ) |  | 7 |  | 7 |  | — |  |  | 1,365 |  | 1,345 |  | (20 | )
CMBS | 896 |  | 882 |  | (14 | ) |  | 1,129 |  | 1,079 |  | (50 | ) |  | 2,025 |  | 1,961 |  | (64 | )
Corporate | 7,174 |  | 6,903 |  | (271 | ) |  | 2,541 |  | 2,366 |  | (175 | ) |  | 9,715 |  | 9,269 |  | (446 | )
Foreign govt./govt. agencies | 407 |  | 391 |  | (16 | ) |  | 203 |  | 193 |  | (10 | ) |  | 610 |  | 584 |  | (26 | )
Municipal | 1,643 |  | 1,613 |  | (30 | ) |  | 292 |  | 275 |  | (17 | ) |  | 1,935 |  | 1,888 |  | (47 | )
RMBS | 1,344 |  | 1,329 |  | (15 | ) |  | 648 |  | 628 |  | (20 | ) |  | 1,992 |  | 1,957 |  | (35 | )
U.S. Treasuries | 497 |  | 492 |  | (5 | ) |  | 339 |  | 329 |  | (10 | ) |  | 836 |  | 821 |  | (15 | )
Total fixed maturities, AFS in an unrealized loss position | $ | 13,885 |  | $ | 13,514 |  | $ | (371 | ) |  | $ | 5,272 |  | $ | 4,989 |  | $ | (283 | ) |  | $ | 19,157 |  | $ | 18,503 |  | $ | (654 | )
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 | )
CLOs | 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 in an unrealized loss position | 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 standards for financial instruments, equity securities, AFS were reclassified to equity securities at fair value and are excluded from the table above as of December 31, 2018.
Valuation Allowance Activity | Valuation Allowance Activity
| For the years ended December 31,
| 2018 | 2017 | 2016
Balance as of January 1 | $ | (1 | ) | $ | — |  | $ | (4 | )
Reversals/(Additions) | — |  | (1 | ) | — |
Deductions | — |  | — |  | 4 |
Balance as of December 31 | $ | (1 | ) | $ | (1 | ) | $ | — |
Loans Credit Quality | Mortgage Loans Credit Quality
| December 31, 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% | 386 |  | 1.60x |  | 265 |  | 1.95x
Less than 65% | 3,318 |  | 2.59x |  | 2,892 |  | 2.76x
Total mortgage loans | $ | 3,704 |  | 2.49x |  | $ | 3,175 |  | 2.69x
Mortgage Loans | Mortgage Loans by Region
| December 31, 2018 |  | December 31, 2017
| Carrying Value | Percent of Total |  | Carrying Value | Percent of Total
East North Central | $ | 250 |  | 6.8 | % |  | $ | 251 |  | 7.9 | %
Middle Atlantic | 270 |  | 7.3 | % |  | 272 |  | 8.6 | %
Mountain | 30 |  | 0.8 | % |  | 31 |  | 1.0 | %
New England | 330 |  | 8.9 | % |  | 293 |  | 9.2 | %
Pacific | 917 |  | 24.8 | % |  | 760 |  | 23.9 | %
South Atlantic | 712 |  | 19.2 | % |  | 710 |  | 22.4 | %
West North Central | 148 |  | 4.0 | % |  | 149 |  | 4.7 | %
West South Central | 420 |  | 11.3 | % |  | 278 |  | 8.7 | %
Other [1] | 627 |  | 16.9 | % |  | 431 |  | 13.6 | %
Total mortgage loans | $ | 3,704 |  | 100.0 | % |  | $ | 3,175 |  | 100.0 | %
[1] | Primarily represents loans collateralized by multiple properties in various regions.
Mortgage Loans by Property Type
| December 31, 2018 |  | December 31, 2017
| Carrying Value | Percent of Total |  | Carrying Value | Percent of Total
Commercial |  |  |  |  |
Industrial | 1,108 |  | 29.9 | % |  | 817 |  | 25.7 | %
Multifamily | 1,138 |  | 30.7 | % |  | 1,006 |  | 31.7 | %
Office | 708 |  | 19.1 | % |  | 751 |  | 23.7 | %
Retail | 392 |  | 10.6 | % |  | 367 |  | 11.5 | %
Single Family | 82 |  | 2.2 | % |  | — |  | — | %
Other | 276 |  | 7.5 | % |  | 234 |  | 7.4 | %
Total mortgage loans | $ | 3,704 |  | 100.0 | % |  | $ | 3,175 |  | 100.0 | %
Offsetting Liabilities |
Securities Lending and Repurchase Agreements
| December 31, 2018 | December 31, 2017
| Fair Value | Fair Value |
Securities Lending Transactions: |  |
Gross amount of securities on loan | $ | 820 |  | $ | 922 |
Gross amount of associated liability for collateral received [1] | $ | 840 |  | $ | 945 |
Repurchase agreements: |  |
Gross amount of recognized liabilities for repurchase agreements | $ | 72 |  | $ | 174 |
Gross amount of collateral pledged related to repurchase agreements [2] | $ | 73 |  | $ | 176 |
Gross amount of recognized receivables for reverse repurchase agreements | $ | 64 |  | $ | — |
[1] | Cash collateral received is reinvested in fixed maturities, AFS and short term investments which are included in the Consolidated Balance Sheets. Amount includes additional securities collateral received of $3 and $0 million which are excluded from the Company's Consolidated Balance Sheets as of December 31, 2018 and December 31, 2017, respectively.
[2] Collateral pledged is included within fixed maturities, AFS and short term investments in the Company's 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 December 31, 2018 |  |  |  |  |  |
Other investments | $ | 31 |  | $ | 26 |  | $ | 7 |  | $ | (2 | ) | $ | 2 |  | $ | 3 |
Other liabilities | $ | (92 | ) | $ | (20 | ) | $ | (68 | ) | $ | (4 | ) | $ | (65 | ) | $ | (7 | )
As of December 31, 2017 |  |  |  |  |  |
Other investments | $ | 25 |  | $ | 22 |  | $ | 10 |  | $ | (7 | ) | $ | 1 |  | $ | 2 |
Other liabilities | $ | (115 | ) | $ | (10 | ) | $ | (100 | ) | $ | (5 | ) | $ | (96 | ) | $ | (9 | )
[1] | For amounts shown as of December 31, 2017, certain amounts have been restated to conform to the current year presentation for OTC-cleared derivatives.
[2] | Included in other investments in the Company's Consolidated Balance Sheets.
[3] | Included in other liabilities in the Company's Consolidated Balance Sheets and is limited to the net derivative payable associated with each counterparty.
[4] | Included in other investments in the Company's 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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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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