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FAIR VALUE MEASUREMENTS (Tables) | 12 Months Ended
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Dec. 31, 2019
Fair Value Disclosures [Abstract] |
Fair Value Hierarchy, Assets and Liabilities Measured on Recurring Basis | The following tables present the fair value hierarchy levels of the Company's assets and liabilities that are measured and carried at fair value on a recurring basis as of December 31.
| 2019
(In millions) | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total Fair Value
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available for sale, carried at fair value: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government and agencies |  | $ | 34,878 |  |  |  |  | $ | 1,522 |  |  |  |  | $ | 0 |  |  |  |  | $ | 36,400 |  |
Municipalities |  | 0 |  |  |  |  | 1,847 |  |  |  |  | 0 |  |  |  |  | 1,847 |  |
Mortgage- and asset-backed securities |  | 0 |  |  |  |  | 232 |  |  |  |  | 178 |  |  |  |  | 410 |  |
Public utilities |  | 0 |  |  |  |  | 6,556 |  |  |  |  | 224 |  |  |  |  | 6,780 |  |
Sovereign and supranational |  | 0 |  |  |  |  | 1,042 |  |  |  |  | 0 |  |  |  |  | 1,042 |  |
Banks/financial institutions |  | 0 |  |  |  |  | 10,264 |  |  |  |  | 23 |  |  |  |  | 10,287 |  |
Other corporate |  | 0 |  |  |  |  | 34,234 |  |  |  |  | 262 |  |  |  |  | 34,496 |  |
Total fixed maturity securities |  | 34,878 |  |  |  |  | 55,697 |  |  |  |  | 687 |  |  |  |  | 91,262 |  |
Equity securities |  | 642 |  |  |  |  | 80 |  |  |  |  | 80 |  |  |  |  | 802 |  |
Other investments |  | 628 |  |  |  |  | 0 |  |  |  |  | 0 |  |  |  |  | 628 |  |
Cash and cash equivalents |  | 4,896 |  |  |  |  | 0 |  |  |  |  | 0 |  |  |  |  | 4,896 |  |
Other assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency swaps |  | 0 |  |  |  |  | 72 |  |  |  |  | 169 |  |  |  |  | 241 |  |
Foreign currency forwards |  | 0 |  |  |  |  | 238 |  |  |  |  | 0 |  |  |  |  | 238 |  |
Interest rate swaps |  | 0 |  |  |  |  | 3 |  |  |  |  | 0 |  |  |  |  | 3 |  |
Total other assets |  | 0 |  |  |  |  | 313 |  |  |  |  | 169 |  |  |  |  | 482 |  |
Total assets |  | $ | 41,044 |  |  |  |  | $ | 56,090 |  |  |  |  | $ | 936 |  |  |  |  | $ | 98,070 |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency swaps |  | $ | 0 |  |  |  |  | $ | 78 |  |  |  |  | $ | 126 |  |  |  |  | $ | 204 |  |
Foreign currency forwards |  | 0 |  |  |  |  | 377 |  |  |  |  | 0 |  |  |  |  | 377 |  |
Foreign currency options |  | 0 |  |  |  |  | 5 |  |  |  |  | 0 |  |  |  |  | 5 |  |
Total liabilities |  | $ | 0 |  |  |  |  | $ | 460 |  |  |  |  | $ | 126 |  |  |  |  | $ | 586 |  |
| 2018
(In millions) | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total Fair Value
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available for sale, carried at fair value: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government and agencies |  | $ | 32,993 |  |  |  |  | $ | 1,349 |  |  |  |  | $ | 0 |  |  |  |  | $ | 34,342 |  |
Municipalities |  | 0 |  |  |  |  | 1,863 |  |  |  |  | 0 |  |  |  |  | 1,863 |  |
Mortgage- and asset-backed securities |  | 0 |  |  |  |  | 162 |  |  |  |  | 177 |  |  |  |  | 339 |  |
Public utilities |  | 0 |  |  |  |  | 7,062 |  |  |  |  | 109 |  |  |  |  | 7,171 |  |
Sovereign and supranational |  | 0 |  |  |  |  | 1,260 |  |  |  |  | 0 |  |  |  |  | 1,260 |  |
Banks/financial institutions |  | 0 |  |  |  |  | 8,895 |  |  |  |  | 23 |  |  |  |  | 8,918 |  |
Other corporate |  | 0 |  |  |  |  | 28,789 |  |  |  |  | 213 |  |  |  |  | 29,002 |  |
Total fixed maturity securities |  | 32,993 |  |  |  |  | 49,380 |  |  |  |  | 522 |  |  |  |  | 82,895 |  |
Equity securities |  | 874 |  |  |  |  | 67 |  |  |  |  | 46 |  |  |  |  | 987 |  |
Other investments |  | 152 |  |  |  |  | 0 |  |  |  |  | 0 |  |  |  |  | 152 |  |
Cash and cash equivalents |  | 4,337 |  |  |  |  | 0 |  |  |  |  | 0 |  |  |  |  | 4,337 |  |
Other assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency swaps |  | 0 |  |  |  |  | 103 |  |  |  |  | 182 |  |  |  |  | 285 |  |
Foreign currency forwards |  | 0 |  |  |  |  | 126 |  |  |  |  | 0 |  |  |  |  | 126 |  |
Foreign currency options |  | 0 |  |  |  |  | 3 |  |  |  |  | 0 |  |  |  |  | 3 |  |
Interest rate swaps |  | 0 |  |  |  |  | 3 |  |  |  |  | 0 |  |  |  |  | 3 |  |
Total other assets |  | 0 |  |  |  |  | 235 |  |  |  |  | 182 |  |  |  |  | 417 |  |
Total assets |  | $ | 38,356 |  |  |  |  | $ | 49,682 |  |  |  |  | $ | 750 |  |  |  |  | $ | 88,788 |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency swaps |  | $ | 0 |  |  |  |  | $ | 132 |  |  |  |  | $ | 102 |  |  |  |  | $ | 234 |  |
Foreign currency forwards |  | 0 |  |  |  |  | 151 |  |  |  |  | 0 |  |  |  |  | 151 |  |
Foreign currency options |  | 0 |  |  |  |  | 1 |  |  |  |  | 0 |  |  |  |  | 1 |  |
Interest rate swaptions |  | 0 |  |  |  |  | 1 |  |  |  |  | 0 |  |  |  |  | 1 |  |
Total liabilities |  | $ | 0 |  |  |  |  | $ | 285 |  |  |  |  | $ | 102 |  |  |  |  | $ | 387 |  |
Fair Value Hierarchy Levels of Assets and Liabilities Carried at Cost or Amortized Cost | The following tables present the carrying amount and fair value categorized by fair value hierarchy level for the Company's financial instruments that are not carried at fair value as of December 31.
| 2019
(In millions) | Carrying Value | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) | Total Fair Value |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities held to maturity, carried at amortized cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government and agencies |  | $ | 22,241 |  |  |  | $ | 27,937 |  |  |  |  | $ | 354 |  |  |  |  | $ | 0 |  |  |  |  | $ | 28,291 |  |
Municipalities |  | 821 |  |  |  | 0 |  |  |  |  | 1,083 |  |  |  |  | 0 |  |  |  |  | 1,083 |  |
Mortgage and asset-backed securities |  | 16 |  |  |  | 0 |  |  |  |  | 7 |  |  |  |  | 10 |  |  |  |  | 17 |  |
Public utilities |  | 2,535 |  |  |  | 0 |  |  |  |  | 2,954 |  |  |  |  | 0 |  |  |  |  | 2,954 |  |
Sovereign and supranational |  | 1,123 |  |  |  | 0 |  |  |  |  | 1,320 |  |  |  |  | 0 |  |  |  |  | 1,320 |  |
Banks/financial institutions |  | 916 |  |  |  | 0 |  |  |  |  | 1,018 |  |  |  |  | 0 |  |  |  |  | 1,018 |  |
Other corporate |  | 2,433 |  |  |  | 0 |  |  |  |  | 2,911 |  |  |  |  | 0 |  |  |  |  | 2,911 |  |
Commercial mortgage and other loans |  | 9,569 |  |  |  | 0 |  |  |  |  | 0 |  |  |  |  | 9,648 |  |  |  |  | 9,648 |  |
Other investments (1) |  | 30 |  |  |  | 0 |  |  |  |  | 30 |  |  |  |  | 0 |  |  |  |  | 30 |  |
Total assets |  | $ | 39,684 |  |  |  | $ | 27,937 |  |  |  |  | $ | 9,677 |  |  |  |  | $ | 9,658 |  |  |  |  | $ | 47,272 |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other policyholders’ funds |  | $ | 7,317 |  |  |  | $ | 0 |  |  |  |  | $ | 0 |  |  |  |  | $ | 7,234 |  |  |  |  | $ | 7,234 |  |
Notes payable (excluding leases) |  | 6,408 |  |  |  | 0 |  |  |  |  | 6,663 |  |  |  |  | 272 |  |  |  |  | 6,935 |  |
Total liabilities |  | $ | 13,725 |  |  |  | $ | 0 |  |  |  |  | $ | 6,663 |  |  |  |  | $ | 7,506 |  |  |  |  | $ | 14,169 |  |
(1) Excludes policy loans of $250 and equity method investments of $569, at carrying value
|  |  |  | 2018
(In millions) | Carrying Value | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total Fair Value
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities held to maturity, carried at amortized cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government and agencies |  | $ | 21,712 |  |  |  | $ | 27,030 |  |  |  |  | $ | 8 |  |  |  |  | $ | 0 |  |  |  |  | $ | 27,038 |  |
Municipalities |  | 359 |  |  |  | 0 |  |  |  |  | 469 |  |  |  |  | 0 |  |  |  |  | 469 |  |
Mortgage and asset-backed securities |  | 14 |  |  |  | 0 |  |  |  |  | 0 |  |  |  |  | 15 |  |  |  |  | 15 |  |
Public utilities |  | 2,727 |  |  |  | 0 |  |  |  |  | 2,973 |  |  |  |  | 0 |  |  |  |  | 2,973 |  |
Sovereign and supranational |  | 1,551 |  |  |  | 0 |  |  |  |  | 1,840 |  |  |  |  | 0 |  |  |  |  | 1,840 |  |
Banks/financial institutions |  | 1,445 |  |  |  | 0 |  |  |  |  | 1,583 |  |  |  |  | 0 |  |  |  |  | 1,583 |  |
Other corporate |  | 2,510 |  |  |  | 0 |  |  |  |  | 2,804 |  |  |  |  | 0 |  |  |  |  | 2,804 |  |
Commercial mortgage and other loans |  | 6,919 |  |  |  | 0 |  |  |  |  | 0 |  |  |  |  | 6,893 |  |  |  |  | 6,893 |  |
Other investments (1) |  | 26 |  |  |  | 0 |  |  |  |  | 26 |  |  |  |  | 0 |  |  |  |  | 26 |  |
Total assets |  | $ | 37,263 |  |  |  | $ | 27,030 |  |  |  |  | $ | 9,703 |  |  |  |  | $ | 6,908 |  |  |  |  | $ | 43,641 |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other policyholders’ funds |  | $ | 7,146 |  |  |  | $ | 0 |  |  |  |  | $ | 0 |  |  |  |  | $ | 7,067 |  |  |  |  | $ | 7,067 |  |
Notes payable (excluding leases) |  | 5,765 |  |  |  | 0 |  |  |  |  | 5,606 |  |  |  |  | 270 |  |  |  |  | 5,876 |  |
Total liabilities |  | $ | 12,911 |  |  |  | $ | 0 |  |  |  |  | $ | 5,606 |  |  |  |  | $ | 7,337 |  |  |  |  | $ | 12,943 |  |
(1) Excludes policy loans of $232 and equity method investments of $377, at carrying value
Fair Value Assets Securities Carried At Fair Value Primary Pricing Sources | The following tables present the pricing sources for the fair values of the Company's fixed maturity and equity securities as of December 31.
|  | 2019
(In millions) |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total Fair Value
Securities available for sale, carried at fair value: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government and agencies: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third party pricing vendor |  |  | $ | 34,878 |  |  |  |  | $ | 1,522 |  |  |  |  | $ | 0 |  |  |  |  | $ | 36,400 |  |
Total government and agencies |  |  | 34,878 |  |  |  |  | 1,522 |  |  |  |  | 0 |  |  |  |  | 36,400 |  |
Municipalities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third party pricing vendor |  |  | 0 |  |  |  |  | 1,847 |  |  |  |  | 0 |  |  |  |  | 1,847 |  |
Total municipalities |  |  | 0 |  |  |  |  | 1,847 |  |  |  |  | 0 |  |  |  |  | 1,847 |  |
Mortgage- and asset-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third party pricing vendor |  |  | 0 |  |  |  |  | 232 |  |  |  |  | 0 |  |  |  |  | 232 |  |
Broker/other |  |  | 0 |  |  |  |  | 0 |  |  |  |  | 178 |  |  |  |  | 178 |  |
Total mortgage- and asset-backed securities |  |  | 0 |  |  |  |  | 232 |  |  |  |  | 178 |  |  |  |  | 410 |  |
Public utilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third party pricing vendor |  |  | 0 |  |  |  |  | 6,556 |  |  |  |  | 0 |  |  |  |  | 6,556 |  |
Broker/other |  |  | 0 |  |  |  |  | 0 |  |  |  |  | 224 |  |  |  |  | 224 |  |
Total public utilities |  |  | 0 |  |  |  |  | 6,556 |  |  |  |  | 224 |  |  |  |  | 6,780 |  |
Sovereign and supranational: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third party pricing vendor |  |  | 0 |  |  |  |  | 1,042 |  |  |  |  | 0 |  |  |  |  | 1,042 |  |
Total sovereign and supranational |  |  | 0 |  |  |  |  | 1,042 |  |  |  |  | 0 |  |  |  |  | 1,042 |  |
Banks/financial institutions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third party pricing vendor |  |  | 0 |  |  |  |  | 10,264 |  |  |  |  | 0 |  |  |  |  | 10,264 |  |
Broker/other |  |  | 0 |  |  |  |  | 0 |  |  |  |  | 23 |  |  |  |  | 23 |  |
Total banks/financial institutions |  |  | 0 |  |  |  |  | 10,264 |  |  |  |  | 23 |  |  |  |  | 10,287 |  |
Other corporate: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third party pricing vendor |  |  | 0 |  |  |  |  | 34,234 |  |  |  |  | 0 |  |  |  |  | 34,234 |  |
Broker/other |  |  | 0 |  |  |  |  | 0 |  |  |  |  | 262 |  |  |  |  | 262 |  |
Total other corporate |  |  | 0 |  |  |  |  | 34,234 |  |  |  |  | 262 |  |  |  |  | 34,496 |  |
Total securities available for sale |  |  | $ | 34,878 |  |  |  |  | $ | 55,697 |  |  |  |  | $ | 687 |  |  |  |  | $ | 91,262 |  |
Equity securities, carried at fair value: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third party pricing vendor |  |  | $ | 642 |  |  |  |  | $ | 80 |  |  |  |  | $ | 0 |  |  |  |  | $ | 722 |  |
Broker/other |  |  | 0 |  |  |  |  | 0 |  |  |  |  | 80 |  |  |  |  | 80 |  |
Total equity securities |  |  | $ | 642 |  |  |  |  | $ | 80 |  |  |  |  | $ | 80 |  |  |  |  | $ | 802 |  |
|  | 2018
(In millions) |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total Fair Value
Securities available for sale, carried at fair value: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government and agencies: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third party pricing vendor |  |  | $ | 32,993 |  |  |  |  | $ | 1,349 |  |  |  |  | $ | 0 |  |  |  |  | $ | 34,342 |  |
Total government and agencies |  |  | 32,993 |  |  |  |  | 1,349 |  |  |  |  | 0 |  |  |  |  | 34,342 |  |
Municipalities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third party pricing vendor |  |  | 0 |  |  |  |  | 1,863 |  |  |  |  | 0 |  |  |  |  | 1,863 |  |
Total municipalities |  |  | 0 |  |  |  |  | 1,863 |  |  |  |  | 0 |  |  |  |  | 1,863 |  |
Mortgage- and asset-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third party pricing vendor |  |  | 0 |  |  |  |  | 162 |  |  |  |  | 0 |  |  |  |  | 162 |  |
Broker/other |  |  | 0 |  |  |  |  | 0 |  |  |  |  | 177 |  |  |  |  | 177 |  |
Total mortgage- and asset-backed securities |  |  | 0 |  |  |  |  | 162 |  |  |  |  | 177 |  |  |  |  | 339 |  |
Public utilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third party pricing vendor |  |  | 0 |  |  |  |  | 7,062 |  |  |  |  | 0 |  |  |  |  | 7,062 |  |
Broker/other |  |  | 0 |  |  |  |  | 0 |  |  |  |  | 109 |  |  |  |  | 109 |  |
Total public utilities |  |  | 0 |  |  |  |  | 7,062 |  |  |  |  | 109 |  |  |  |  | 7,171 |  |
Sovereign and supranational: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third party pricing vendor |  |  | 0 |  |  |  |  | 1,260 |  |  |  |  | 0 |  |  |  |  | 1,260 |  |
Total sovereign and supranational |  |  | 0 |  |  |  |  | 1,260 |  |  |  |  | 0 |  |  |  |  | 1,260 |  |
Banks/financial institutions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third party pricing vendor |  |  | 0 |  |  |  |  | 8,895 |  |  |  |  | 0 |  |  |  |  | 8,895 |  |
Broker/other |  |  | 0 |  |  |  |  | 0 |  |  |  |  | 23 |  |  |  |  | 23 |  |
Total banks/financial institutions |  |  | 0 |  |  |  |  | 8,895 |  |  |  |  | 23 |  |  |  |  | 8,918 |  |
Other corporate: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third party pricing vendor |  |  | 0 |  |  |  |  | 28,789 |  |  |  |  | 0 |  |  |  |  | 28,789 |  |
Broker/other |  |  | 0 |  |  |  |  | 0 |  |  |  |  | 213 |  |  |  |  | 213 |  |
Total other corporate |  |  | 0 |  |  |  |  | 28,789 |  |  |  |  | 213 |  |  |  |  | 29,002 |  |
Total securities available for sale |  |  | $ | 32,993 |  |  |  |  | $ | 49,380 |  |  |  |  | $ | 522 |  |  |  |  | $ | 82,895 |  |
Equity securities, carried at fair value: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third party pricing vendor |  |  | $ | 874 |  |  |  |  | $ | 67 |  |  |  |  | $ | 0 |  |  |  |  | $ | 941 |  |
Broker/other |  |  | 0 |  |  |  |  | 0 |  |  |  |  | 46 |  |  |  |  | 46 |  |
Total equity securities |  |  | $ | 874 |  |  |  |  | $ | 67 |  |  |  |  | $ | 46 |  |  |  |  | $ | 987 |  |
Fair Value Assets Held-To-Maturity Securities Primary Pricing Sources |
|  | 2019
(In millions) |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total Fair Value
Securities held to maturity, carried at amortized cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government and agencies: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third party pricing vendor |  |  | $ | 27,937 |  |  |  |  | $ | 354 |  |  |  |  | $ | 0 |  |  |  |  | $ | 28,291 |  |
Total government and agencies |  |  | 27,937 |  |  |  |  | 354 |  |  |  |  | 0 |  |  |  |  | 28,291 |  |
Municipalities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third party pricing vendor |  |  | 0 |  |  |  |  | 1,083 |  |  |  |  | 0 |  |  |  |  | 1,083 |  |
Total municipalities |  |  | 0 |  |  |  |  | 1,083 |  |  |  |  | 0 |  |  |  |  | 1,083 |  |
Mortgage- and asset-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third party pricing vendor |  |  | 0 |  |  |  |  | 7 |  |  |  |  | 0 |  |  |  |  | 7 |  |
Broker/other |  |  | 0 |  |  |  |  | 0 |  |  |  |  | 10 |  |  |  |  | 10 |  |
Total mortgage- and asset-backed securities |  |  | 0 |  |  |  |  | 7 |  |  |  |  | 10 |  |  |  |  | 17 |  |
Public utilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third party pricing vendor |  |  | 0 |  |  |  |  | 2,954 |  |  |  |  | 0 |  |  |  |  | 2,954 |  |
Total public utilities |  |  | 0 |  |  |  |  | 2,954 |  |  |  |  | 0 |  |  |  |  | 2,954 |  |
Sovereign and supranational: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third party pricing vendor |  |  | 0 |  |  |  |  | 1,320 |  |  |  |  | 0 |  |  |  |  | 1,320 |  |
Total sovereign and supranational |  |  | 0 |  |  |  |  | 1,320 |  |  |  |  | 0 |  |  |  |  | 1,320 |  |
Banks/financial institutions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third party pricing vendor |  |  | 0 |  |  |  |  | 1,018 |  |  |  |  | 0 |  |  |  |  | 1,018 |  |
Total banks/financial institutions |  |  | 0 |  |  |  |  | 1,018 |  |  |  |  | 0 |  |  |  |  | 1,018 |  |
Other corporate: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third party pricing vendor |  |  | 0 |  |  |  |  | 2,911 |  |  |  |  | 0 |  |  |  |  | 2,911 |  |
Total other corporate |  |  | 0 |  |  |  |  | 2,911 |  |  |  |  | 0 |  |  |  |  | 2,911 |  |
Total securities held to maturity |  |  | $ | 27,937 |  |  |  |  | $ | 9,647 |  |  |  |  | $ | 10 |  |  |  |  | $ | 37,594 |  |
|  | 2018
(In millions) |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total Fair Value
Securities held to maturity, carried at amortized cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government and agencies: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third party pricing vendor |  |  | $ | 27,030 |  |  |  |  | $ | 8 |  |  |  |  | $ | 0 |  |  |  |  | $ | 27,038 |  |
Total government and agencies |  |  | 27,030 |  |  |  |  | 8 |  |  |  |  | 0 |  |  |  |  | 27,038 |  |
Municipalities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third party pricing vendor |  |  | 0 |  |  |  |  | 469 |  |  |  |  | 0 |  |  |  |  | 469 |  |
Total municipalities |  |  | 0 |  |  |  |  | 469 |  |  |  |  | 0 |  |  |  |  | 469 |  |
Mortgage- and asset-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Broker/other |  |  | 0 |  |  |  |  | 0 |  |  |  |  | 15 |  |  |  |  | 15 |  |
Total mortgage- and asset-backed securities |  |  | 0 |  |  |  |  | 0 |  |  |  |  | 15 |  |  |  |  | 15 |  |
Public utilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third party pricing vendor |  |  | 0 |  |  |  |  | 2,973 |  |  |  |  | 0 |  |  |  |  | 2,973 |  |
Total public utilities |  |  | 0 |  |  |  |  | 2,973 |  |  |  |  | 0 |  |  |  |  | 2,973 |  |
Sovereign and supranational: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third party pricing vendor |  |  | 0 |  |  |  |  | 1,840 |  |  |  |  | 0 |  |  |  |  | 1,840 |  |
Total sovereign and supranational |  |  | 0 |  |  |  |  | 1,840 |  |  |  |  | 0 |  |  |  |  | 1,840 |  |
Banks/financial institutions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third party pricing vendor |  |  | 0 |  |  |  |  | 1,583 |  |  |  |  | 0 |  |  |  |  | 1,583 |  |
Total banks/financial institutions |  |  | 0 |  |  |  |  | 1,583 |  |  |  |  | 0 |  |  |  |  | 1,583 |  |
Other corporate: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third party pricing vendor |  |  | 0 |  |  |  |  | 2,804 |  |  |  |  | 0 |  |  |  |  | 2,804 |  |
Total other corporate |  |  | 0 |  |  |  |  | 2,804 |  |  |  |  | 0 |  |  |  |  | 2,804 |  |
Total securities held to maturity |  |  | $ | 27,030 |  |  |  |  | $ | 9,677 |  |  |  |  | $ | 15 |  |  |  |  | $ | 36,722 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation | The following tables present the changes in fair value of the Company's investments and derivatives carried at fair value classified as Level 3 as of December 31.
2019 |
| Fixed Maturity Securities |  | Equity Securities |  | Derivatives(1) |  |  |
(In millions) | Mortgage- and Asset- Backed Securities |  | Public Utilities |  | Banks/ Financial Institutions |  | Other Corporate |  |  |  | Foreign Currency Swaps |  | Credit Default Swaps |  | Total |
Balance, beginning of period | $ | 177 |  |  | $ | 109 |  |  | $ | 23 |  |  | $ | 213 |  |  | $ | 46 |  |  | $ | 80 |  |  | $ | 0 |  |  | $ | 648 |  |
Realized investment gains (losses) included in earnings | 0 |  |  | 0 |  |  | 0 |  |  | (1 | ) |  | 0 |  |  | (33 | ) |  | 0 |  |  | (34 | ) |
Unrealized gains (losses) included in other comprehensive income (loss) | 1 |  |  | 6 |  |  | 1 |  |  | 8 |  |  | 0 |  |  | (4 | ) |  | 0 |  |  | 12 |  |
Purchases, issuances, sales and settlements: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchases | 0 |  |  | 48 |  |  | 0 |  |  | 165 |  |  | 34 |  |  | 0 |  |  | 0 |  |  | 247 |  |
Issuances | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |
Sales | 0 |  |  | (24 | ) |  | 0 |  |  | (17 | ) |  | 0 |  |  | 0 |  |  | 0 |  |  | (41 | ) |
Settlements | 0 |  |  | (6 | ) |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | (6 | ) |
Transfers into Level 3 | 0 |  |  | 116 |  | (2) | 0 |  |  | 26 |  | (2) | 0 |  |  | 0 |  |  | 0 |  |  | 142 |  |
Transfers out of Level 3 | 0 |  |  | (25 | ) | (2) | (1 | ) |  | (132 | ) | (2), (3) | 0 |  |  | 0 |  |  | 0 |  |  | (158 | ) |
Balance, end of period | $ | 178 |  |  | $ | 224 |  |  | $ | 23 |  |  | $ | 262 |  |  | $ | 80 |  |  | $ | 43 |  |  | $ | 0 |  |  | $ | 810 |  |
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings | $ | 0 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | (33 | ) |  | $ | 0 |  |  | $ | (33 | ) |
(1) Derivative assets and liabilities are presented net (2) Transfer due to sector classification change (3) Transfer due to availability of observable market inputs
2018 |
| Fixed Maturity Securities |  | Equity Securities |  | Derivatives(1) |  |  |
(In millions) | Mortgage- and Asset- Backed Securities |  | Public Utilities |  | Banks/ Financial Institutions |  | Other Corporate |  |  |  | Foreign Currency Swaps |  | Credit Default Swaps |  | Total |
Balance, beginning of period | $ | 175 |  |  | $ | 68 |  |  | $ | 25 |  |  | $ | 146 |  |  | $ | 16 |  |  | $ | 22 |  |  | $ | 1 |  |  | $ | 453 |  |
Realized investment gains (losses) included in earnings | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | (1 | ) |  | 54 |  |  | (1 | ) |  | 52 |  |
Unrealized gains (losses) included in other comprehensive income (loss) | 2 |  |  | 1 |  |  | (2 | ) |  | 1 |  |  | 0 |  |  | 4 |  |  | 0 |  |  | 6 |  |
Purchases, issuances, sales and settlements: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchases | 0 |  |  | 40 |  |  | 0 |  |  | 56 |  |  | 31 |  |  | 0 |  |  | 0 |  |  | 127 |  |
Issuances | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |
Sales | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |
Settlements | 0 |  |  | 0 |  |  | 0 |  |  | (6 | ) |  | 0 |  |  | 0 |  |  | 0 |  |  | (6 | ) |
Transfers into Level 3 | 0 |  |  | 0 |  |  | 0 |  |  | 16 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 16 |  |
Transfers out of Level 3 | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |
Balance, end of period | $ | 177 |  |  | $ | 109 |  |  | $ | 23 |  |  | $ | 213 |  |  | $ | 46 |  |  | $ | 80 |  |  | $ | 0 |  |  | $ | 648 |  |
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings | $ | 0 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | (1 | ) |  | $ | 54 |  |  | $ | (1 | ) |  | $ | 52 |  |
(1) Derivative assets and liabilities are presented net
Fair Value Measurement Inputs and Valuation Techniques | Level 3 Significant Unobservable Input Sensitivity The following tables summarize the significant unobservable inputs used in the valuation of the Company's Level 3 investments and derivatives carried at fair value as of December 31. Included in the tables are the inputs or range of possible inputs that have an effect on the overall valuation of the financial instruments.
2019
(In millions) |  | Fair Value |  | Valuation Technique(s) |  | Unobservable Input |  | Range (Weighted Average) |
Assets: |  |  |  |  |  |  |  |  |  |  |
Securities available for sale, carried at fair value: |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities: |  |  |  |  |  |  |  |  |  |  |
Mortgage- and asset-backed securities |  |  | $ | 178 |  |  |  | Consensus pricing |  | Offered quotes |  | N/A | (a)
Public utilities |  |  | 224 |  |  |  | Discounted cash flow |  | Credit spreads |  | N/A | (a)
Banks/financial institutions |  |  | 23 |  |  |  | Consensus pricing |  | Offered quotes |  | N/A | (a)
Other corporate |  |  | 262 |  |  |  | Discounted cash flow |  | Credit spreads |  | N/A | (a)
Equity securities |  |  | 80 |  |  |  | Net asset value |  | Offered quotes |  | N/A | (a)
Other assets: |  |  |  |  |  |  |  |  |  |  |
Foreign currency swaps |  |  | 106 |  |  |  | Discounted cash flow |  | Interest rates (USD) |  | 1.89% - 2.09% | (b)
|  |  |  |  |  |  |  | Interest rates (JPY) |  | .12% - .43% | (c)
|  |  |  |  |  |  |  | CDS spreads |  | 10 - 100 bps |
|  |  | 63 |  |  |  | Discounted cash flow |  | Interest rates (USD) |  | 1.89% - 2.09% | (b)
|  |  |  |  |  |  |  | Interest rates (JPY) |  | .12% - .43% | (c)
Total assets |  |  | $ | 936 |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Other liabilities: |  |  |  |  |  |  |  |  |  |  |
Foreign currency swaps |  |  | $ | 118 |  |  |  | Discounted cash flow |  | Interest rates (USD) |  | 1.89% - 2.09% | (b)
|  |  |  |  |  |  |  | Interest rates (JPY) |  | .12% - .43% | (c)
|  |  |  |  |  |  |  | CDS spreads |  | 13 - 159 bps |
|  |  | 8 |  |  |  | Discounted cash flow |  | Interest rates (USD) |  | 1.89% - 2.09% | (b)
|  |  |  |  |  |  |  | Interest rates (JPY) |  | .12% - .43% | (c)
Total liabilities |  |  | $ | 126 |  |  |  |  |  |  |  |  |
(a) N/A represents securities where the Company receives unadjusted broker quotes and for which there is no transparency into the providers' valuation techniques or unobservable inputs. (b) Inputs derived from U.S. long-term rates to accommodate long maturity nature of the Company's swaps (c) Inputs derived from Japan long-term rates to accommodate long maturity nature of the Company's swaps
2018
(In millions) |  | Fair Value |  | Valuation Technique(s) |  | Unobservable Input |  | Range (Weighted Average) |
Assets: |  |  |  |  |  |  |  |  |  |  |
Securities available for sale, carried at fair value: |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities: |  |  |  |  |  |  |  |  |  |  |
Mortgage- and asset-backed securities |  |  | $ | 177 |  |  |  | Consensus pricing |  | Offered quotes |  | N/A | (a)
Public utilities |  |  | 109 |  |  |  | Discounted cash flow |  | Credit spreads |  | N/A | (a)
Banks/financial institutions |  |  | 23 |  |  |  | Consensus pricing |  | Offered quotes |  | N/A | (a)
Other corporate |  |  | 213 |  |  |  | Discounted cash flow |  | Credit spreads |  | N/A | (a)
Equity securities |  |  | 46 |  |  |  | Net asset value |  | Offered quotes |  | N/A | (a)
Other assets: |  |  |  |  |  |  |  |  |  |  |
Foreign currency swaps |  |  | 125 |  |  |  | Discounted cash flow |  | Interest rates (USD) |  | 2.75% - 2.84% | (b)
|  |  |  |  |  |  |  | Interest rates (JPY) |  | .18% - .71% | (c)
|  |  |  |  |  |  |  | CDS spreads |  | 19 - 120 bps |
|  |  | 57 |  |  |  | Discounted cash flow |  | Interest rates (USD) |  | 2.75% - 2.84% | (b)
|  |  |  |  |  |  |  | Interest rates (JPY) |  | .18% - .71% | (c)
Total assets |  |  | $ | 750 |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Other liabilities: |  |  |  |  |  |  |  |  |  |  |
Foreign currency swaps |  |  | $ | 98 |  |  |  | Discounted cash flow |  | Interest rates (USD) |  | 2.75% - 2.84% | (b)
|  |  |  |  |  |  |  | Interest rates (JPY) |  | .18% - .71% | (c)
|  |  |  |  |  |  |  | CDS spreads |  | 28 - 211 bps |
|  |  | 4 |  |  |  | Discounted cash flow |  | Interest rates (USD) |  | 2.75% - 2.84% | (b)
|  |  |  |  |  |  |  | Interest rates (JPY) |  | .18% - .71% | (c)
Total liabilities |  |  | $ | 102 |  |  |  |  |  |  |  |  |
(a) N/A represents securities where the Company receives unadjusted broker quotes and for which there is no transparency into the providers' valuation techniques or unobservable inputs. (b) Inputs derived from U.S. long-term rates to accommodate long maturity nature of the Company's swaps (c) Inputs derived from Japan long-term rates to accommodate long maturity nature of the Company's swaps

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