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INVESTMENTS (Tables) | 9 Months Ended
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Sep. 30, 2017
Available-for-sale Securities | The amortized cost for the Company's investments in debt and perpetual securities, the cost for equity securities and the fair values of these investments are shown in the following tables.
| September 30, 2017
(In millions) | Cost or Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Securities available for sale, carried at fair value: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Yen-denominated: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Japan government and agencies |  | $ | 27,027 |  |  |  |  | $ | 3,272 |  |  |  |  | $ | 423 |  |  |  |  | $ | 29,876 |  |
Municipalities |  | 315 |  |  |  |  | 26 |  |  |  |  | 15 |  |  |  |  | 326 |  |
Mortgage- and asset-backed securities |  | 248 |  |  |  |  | 29 |  |  |  |  | 0 |  |  |  |  | 277 |  |
Public utilities |  | 1,643 |  |  |  |  | 369 |  |  |  |  | 7 |  |  |  |  | 2,005 |  |
Sovereign and supranational |  | 1,428 |  |  |  |  | 190 |  |  |  |  | 3 |  |  |  |  | 1,615 |  |
Banks/financial institutions |  | 3,307 |  |  |  |  | 494 |  |  |  |  | 59 |  |  |  |  | 3,742 |  |
Other corporate |  | 3,811 |  |  |  |  | 771 |  |  |  |  | 25 |  |  |  |  | 4,557 |  |
Total yen-denominated |  | 37,779 |  |  |  |  | 5,151 |  |  |  |  | 532 |  |  |  |  | 42,398 |  |
U.S. dollar-denominated: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government and agencies |  | 150 |  |  |  |  | 12 |  |  |  |  | 0 |  |  |  |  | 162 |  |
Municipalities |  | 818 |  |  |  |  | 148 |  |  |  |  | 0 |  |  |  |  | 966 |  |
Mortgage- and asset-backed securities |  | 166 |  |  |  |  | 13 |  |  |  |  | 0 |  |  |  |  | 179 |  |
Public utilities |  | 5,231 |  |  |  |  | 813 |  |  |  |  | 34 |  |  |  |  | 6,010 |  |
Sovereign and supranational |  | 325 |  |  |  |  | 89 |  |  |  |  | 0 |  |  |  |  | 414 |  |
Banks/financial institutions |  | 2,683 |  |  |  |  | 592 |  |  |  |  | 7 |  |  |  |  | 3,268 |  |
Other corporate |  | 25,092 |  |  |  |  | 2,388 |  |  |  |  | 462 |  |  |  |  | 27,018 |  |
Total U.S. dollar-denominated |  | 34,465 |  |  |  |  | 4,055 |  |  |  |  | 503 |  |  |  |  | 38,017 |  |
Total fixed maturities |  | 72,244 |  |  |  |  | 9,206 |  |  |  |  | 1,035 |  |  |  |  | 80,415 |  |
Perpetual securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Yen-denominated: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Banks/financial institutions |  | 1,308 |  |  |  |  | 277 |  |  |  |  | 32 |  |  |  |  | 1,553 |  |
Other corporate |  | 195 |  |  |  |  | 41 |  |  |  |  | 0 |  |  |  |  | 236 |  |
U.S. dollar-denominated: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Banks/financial institutions |  | 46 |  |  |  |  | 28 |  |  |  |  | 0 |  |  |  |  | 74 |  |
Total perpetual securities |  | 1,549 |  |  |  |  | 346 |  |  |  |  | 32 |  |  |  |  | 1,863 |  |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Yen-denominated |  | 555 |  |  |  |  | 95 |  |  |  |  | 2 |  |  |  |  | 648 |  |
U.S. dollar-denominated |  | 256 |  |  |  |  | 30 |  |  |  |  | 6 |  |  |  |  | 280 |  |
Total equity securities |  | 811 |  |  |  |  | 125 |  |  |  |  | 8 |  |  |  |  | 928 |  |
Total securities available for sale |  | $ | 74,604 |  |  |  |  | $ | 9,677 |  |  |  |  | $ | 1,075 |  |  |  |  | $ | 83,206 |  |
| December 31, 2016
(In millions) | Cost or Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Securities available for sale, carried at fair value: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Yen-denominated: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Japan government and agencies |  | $ | 22,857 |  |  |  |  | $ | 3,359 |  |  |  |  | $ | 160 |  |  |  |  | $ | 26,056 |  |
Municipalities |  | 246 |  |  |  |  | 29 |  |  |  |  | 8 |  |  |  |  | 267 |  |
Mortgage- and asset-backed securities |  | 1,096 |  |  |  |  | 33 |  |  |  |  | 8 |  |  |  |  | 1,121 |  |
Public utilities |  | 1,533 |  |  |  |  | 318 |  |  |  |  | 3 |  |  |  |  | 1,848 |  |
Sovereign and supranational |  | 862 |  |  |  |  | 186 |  |  |  |  | 5 |  |  |  |  | 1,043 |  |
Banks/financial institutions |  | 2,673 |  |  |  |  | 403 |  |  |  |  | 74 |  |  |  |  | 3,002 |  |
Other corporate |  | 3,192 |  |  |  |  | 623 |  |  |  |  | 3 |  |  |  |  | 3,812 |  |
Total yen-denominated |  | 32,459 |  |  |  |  | 4,951 |  |  |  |  | 261 |  |  |  |  | 37,149 |  |
U.S dollar-denominated: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government and agencies |  | 148 |  |  |  |  | 10 |  |  |  |  | 0 |  |  |  |  | 158 |  |
Municipalities |  | 894 |  |  |  |  | 142 |  |  |  |  | 8 |  |  |  |  | 1,028 |  |
Mortgage- and asset-backed securities |  | 196 |  |  |  |  | 20 |  |  |  |  | 0 |  |  |  |  | 216 |  |
Public utilities |  | 5,205 |  |  |  |  | 690 |  |  |  |  | 60 |  |  |  |  | 5,835 |  |
Sovereign and supranational |  | 335 |  |  |  |  | 91 |  |  |  |  | 0 |  |  |  |  | 426 |  |
Banks/financial institutions |  | 2,570 |  |  |  |  | 507 |  |  |  |  | 16 |  |  |  |  | 3,061 |  |
Other corporate |  | 24,556 |  |  |  |  | 2,021 |  |  |  |  | 690 |  |  |  |  | 25,887 |  |
Total U.S. dollar-denominated |  | 33,904 |  |  |  |  | 3,481 |  |  |  |  | 774 |  |  |  |  | 36,611 |  |
Total fixed maturities |  | 66,363 |  |  |  |  | 8,432 |  |  |  |  | 1,035 |  |  |  |  | 73,760 |  |
Perpetual securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Yen-denominated: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Banks/financial institutions |  | 1,266 |  |  |  |  | 128 |  |  |  |  | 49 |  |  |  |  | 1,345 |  |
Other corporate |  | 189 |  |  |  |  | 24 |  |  |  |  | 0 |  |  |  |  | 213 |  |
U.S. dollar-denominated: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Banks/financial institutions |  | 51 |  |  |  |  | 24 |  |  |  |  | 0 |  |  |  |  | 75 |  |
Total perpetual securities |  | 1,506 |  |  |  |  | 176 |  |  |  |  | 49 |  |  |  |  | 1,633 |  |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Yen-denominated |  | 624 |  |  |  |  | 83 |  |  |  |  | 2 |  |  |  |  | 705 |  |
U.S. dollar-denominated |  | 579 |  |  |  |  | 31 |  |  |  |  | 6 |  |  |  |  | 604 |  |
Total equity securities |  | 1,203 |  |  |  |  | 114 |  |  |  |  | 8 |  |  |  |  | 1,309 |  |
Total securities available for sale |  | $ | 69,072 |  |  |  |  | $ | 8,722 |  |  |  |  | $ | 1,092 |  |  |  |  | $ | 76,702 |  |
Held-to-maturity Securities |
| December 31, 2016
(In millions) | Cost or Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Securities held to maturity, carried at amortized cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Yen-denominated: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Japan government and agencies |  | $ | 20,702 |  |  |  |  | $ | 5,338 |  |  |  |  | $ | 0 |  |  |  |  | $ | 26,040 |  |
Municipalities |  | 350 |  |  |  |  | 107 |  |  |  |  | 0 |  |  |  |  | 457 |  |
Mortgage- and asset-backed securities |  | 30 |  |  |  |  | 2 |  |  |  |  | 0 |  |  |  |  | 32 |  |
Public utilities |  | 3,201 |  |  |  |  | 358 |  |  |  |  | 23 |  |  |  |  | 3,536 |  |
Sovereign and supranational |  | 2,602 |  |  |  |  | 283 |  |  |  |  | 8 |  |  |  |  | 2,877 |  |
Banks/financial institutions |  | 3,731 |  |  |  |  | 195 |  |  |  |  | 26 |  |  |  |  | 3,900 |  |
Other corporate |  | 2,734 |  |  |  |  | 452 |  |  |  |  | 7 |  |  |  |  | 3,179 |  |
Total yen-denominated |  | 33,350 |  |  |  |  | 6,735 |  |  |  |  | 64 |  |  |  |  | 40,021 |  |
Total securities held to maturity |  | $ | 33,350 |  |  |  |  | $ | 6,735 |  |  |  |  | $ | 64 |  |  |  |  | $ | 40,021 |  |
| September 30, 2017
(In millions) | Cost or Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Securities held to maturity, carried at amortized cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Yen-denominated: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Japan government and agencies |  | $ | 21,385 |  |  |  |  | $ | 5,070 |  |  |  |  | $ | 0 |  |  |  |  | $ | 26,455 |  |
Municipalities |  | 359 |  |  |  |  | 104 |  |  |  |  | 0 |  |  |  |  | 463 |  |
Mortgage- and asset-backed securities |  | 27 |  |  |  |  | 2 |  |  |  |  | 0 |  |  |  |  | 29 |  |
Public utilities |  | 3,308 |  |  |  |  | 426 |  |  |  |  | 0 |  |  |  |  | 3,734 |  |
Sovereign and supranational |  | 1,527 |  |  |  |  | 319 |  |  |  |  | 0 |  |  |  |  | 1,846 |  |
Banks/financial institutions |  | 2,700 |  |  |  |  | 205 |  |  |  |  | 18 |  |  |  |  | 2,887 |  |
Other corporate |  | 2,692 |  |  |  |  | 493 |  |  |  |  | 0 |  |  |  |  | 3,185 |  |
Total yen-denominated |  | 31,998 |  |  |  |  | 6,619 |  |  |  |  | 18 |  |  |  |  | 38,599 |  |
Total securities held to maturity |  | $ | 31,998 |  |  |  |  | $ | 6,619 |  |  |  |  | $ | 18 |  |  |  |  | $ | 38,599 |  |
Investments Classified by Contractual Maturity Date | The contractual maturities of the Company's investments in fixed maturities at September 30, 2017, were as follows:
| Aflac Japan |  | Aflac U.S.
(In millions) | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due in one year or less |  | $ | 175 |  |  |  |  | $ | 181 |  |  |  |  | $ | 53 |  |  |  |  | $ | 54 |  |
Due after one year through five years |  | 5,734 |  |  |  |  | 6,029 |  |  |  |  | 637 |  |  |  |  | 682 |  |
Due after five years through 10 years |  | 9,078 |  |  |  |  | 9,668 |  |  |  |  | 3,253 |  |  |  |  | 3,529 |  |
Due after 10 years |  | 43,860 |  |  |  |  | 49,502 |  |  |  |  | 8,443 |  |  |  |  | 9,698 |  |
Mortgage- and asset-backed securities |  | 290 |  |  |  |  | 330 |  |  |  |  | 40 |  |  |  |  | 42 |  |
Total fixed maturities available for sale |  | $ | 59,137 |  |  |  |  | $ | 65,710 |  |  |  |  | $ | 12,426 |  |  |  |  | $ | 14,005 |  |
Held to maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due in one year or less |  | $ | 488 |  |  |  |  | $ | 497 |  |  |  |  | $ | 0 |  |  |  |  | $ | 0 |  |
Due after one year through five years |  | 923 |  |  |  |  | 970 |  |  |  |  | 0 |  |  |  |  | 0 |  |
Due after five years through 10 years |  | 1,638 |  |  |  |  | 1,810 |  |  |  |  | 0 |  |  |  |  | 0 |  |
Due after 10 years |  | 28,922 |  |  |  |  | 35,293 |  |  |  |  | 0 |  |  |  |  | 0 |  |
Mortgage- and asset-backed securities |  | 27 |  |  |  |  | 29 |  |  |  |  | 0 |  |  |  |  | 0 |  |
Total fixed maturities held to maturity |  | $ | 31,998 |  |  |  |  | $ | 38,599 |  |  |  |  | $ | 0 |  |  |  |  | $ | 0 |  |
Economic Maturities of Investments in Perpetual Securities | The economic maturities of the Company's investments in perpetual securities, which were all reported as available for sale at September 30, 2017, were as follows:
| Aflac Japan |  | Aflac U.S.
(In millions) | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Due in one year or less |  | $ | 84 |  |  |  |  | $ | 85 |  |  |  |  | $ | 0 |  |  |  |  | $ | 0 |  |
Due after one year through five years |  | 194 |  |  |  |  | 236 |  |  |  |  | 0 |  |  |  |  | 0 |  |
Due after 10 years |  | 1,232 |  |  |  |  | 1,482 |  |  |  |  | 39 |  |  |  |  | 60 |  |
Total perpetual securities available for sale |  | $ | 1,510 |  |  |  |  | $ | 1,803 |  |  |  |  | $ | 39 |  |  |  |  | $ | 60 |  |
Investment Exposures Exceeding Ten Percent Shareholders Equity | Investment exposures that individually exceeded 10% of shareholders' equity were as follows:
| September 30, 2017 |  | December 31, 2016
(In millions) | Credit Rating |  | Amortized Cost |  | Fair Value |  | Credit Rating |  | Amortized Cost |  | Fair Value
Japan National Government(1) | A |  | $47,637 |  | $55,444 |  | A |  | $42,931 |  | $51,345
(1)Japan Government Bonds (JGBs) or JGB-backed securities
Gain (Loss) on Investments | Information regarding pretax realized gains and losses from investments is as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30, |
(In millions) | 2017 |  | 2016 |  | 2017 |  | 2016 |
Realized investment gains (losses): |  |  |  |  |  |  |  |
Fixed maturities: |  |  |  |  |  |  |  |
Available for sale: |  |  |  |  |  |  |  |
Gross gains from sales | $ | 10 |  |  | $ | 2 |  |  | $ | 27 |  |  | $ | 10 |  |
Gross losses from sales | (8 | ) |  | (22 | ) |  | (38 | ) |  | (38 | ) |
Net gains (losses) from redemptions | 14 |  |  | 1 |  |  | (24 | ) |  | 88 |  |
Other-than-temporary impairment losses | (2 | ) |  | (1 | ) |  | (9 | ) |  | (23 | ) |
Total fixed maturities | 14 |  |  | (20 | ) |  | (44 | ) |  | 37 |  |
Perpetual securities: |  |  |  |  |  |  |  |
Available for sale: |  |  |  |  |  |  |  |
Net gains (losses) from redemptions | 0 |  |  | 0 |  |  | 4 |  |  | 40 |  |
Other-than-temporary impairment losses | 0 |  |  | 0 |  |  | 0 |  |  | (2 | ) |
Total perpetual securities | 0 |  |  | 0 |  |  | 4 |  |  | 38 |  |
Equity securities: |  |  |  |  |  |  |  |
Gross gains from sales | 54 |  |  | 5 |  |  | 102 |  |  | 10 |  |
Gross losses from sales | (9 | ) |  | 0 |  |  | (11 | ) |  | (10 | ) |
Other-than-temporary impairment losses | (6 | ) |  | (22 | ) |  | (18 | ) |  | (46 | ) |
Total equity securities | 39 |  |  | (17 | ) |  | 73 |  |  | (46 | ) |
Derivatives and other: |  |  |  |  |  |  |  |
Derivative gains (losses) | (40 | ) |  | (107 | ) |  | (143 | ) |  | (278 | ) |
Foreign currency gains (losses) | 17 |  |  | (20 | ) |  | (56 | ) |  | (109 | ) |
Total derivatives and other | (23 | ) |  | (127 | ) |  | (199 | ) |  | (387 | ) |
Total realized investment gains (losses) | $ | 30 |  |  | $ | (164 | ) |  | $ | (166 | ) |  | $ | (358 | ) |
Prior year foreign currency transaction gains and losses have been reclassified to conform to current-year reporting classifications
Net Effect on Shareholders' Equity of Unrealized Gains and Losses from Investment Securities | The net effect on shareholders’ equity of unrealized gains and losses from investment securities was as follows:
(In millions) | September 30, 2017 |  | December 31, 2016
Unrealized gains (losses) on securities available for sale |  | $ | 8,602 |  |  |  |  | $ | 7,630 |  |
Deferred income taxes |  | (3,165 | ) |  |  |  | (2,825 | ) |
Shareholders’ equity, unrealized gains (losses) on investment securities |  | $ | 5,437 |  |  |  |  | $ | 4,805 |  |
Investments Gross Unrealized Loss Aging | The following tables show the fair values and gross unrealized losses of the Company's available-for-sale and held-to-maturity investments that were in an unrealized loss position, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position.
| September 30, 2017
| Total |  | Less than 12 months |  | 12 months or longer
(In millions) | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Fixed Maturities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Japan government and agencies: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Yen-denominated |  | $ | 6,404 |  |  |  |  | $ | 423 |  |  |  |  | $ | 6,208 |  |  |  |  | $ | 399 |  |  |  |  | $ | 196 |  |  |  |  | $ | 24 |  |
Municipalities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Yen-denominated |  | 152 |  |  |  |  | 15 |  |  |  |  | 62 |  |  |  |  | 3 |  |  |  |  | 90 |  |  |  |  | 12 |  |
Public utilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. dollar-denominated |  | 879 |  |  |  |  | 34 |  |  |  |  | 252 |  |  |  |  | 4 |  |  |  |  | 627 |  |  |  |  | 30 |  |
Yen-denominated |  | 95 |  |  |  |  | 7 |  |  |  |  | 69 |  |  |  |  | 6 |  |  |  |  | 26 |  |  |  |  | 1 |  |
Sovereign and supranational: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Yen-denominated |  | 352 |  |  |  |  | 3 |  |  |  |  | 352 |  |  |  |  | 3 |  |  |  |  | 0 |  |  |  |  | 0 |  |
Banks/financial institutions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. dollar-denominated |  | 188 |  |  |  |  | 7 |  |  |  |  | 145 |  |  |  |  | 3 |  |  |  |  | 43 |  |  |  |  | 4 |  |
Yen-denominated |  | 1,616 |  |  |  |  | 77 |  |  |  |  | 637 |  |  |  |  | 29 |  |  |  |  | 979 |  |  |  |  | 48 |  |
Other corporate: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. dollar-denominated |  | 7,886 |  |  |  |  | 462 |  |  |  |  | 2,803 |  |  |  |  | 52 |  |  |  |  | 5,083 |  |  |  |  | 410 |  |
Yen-denominated |  | 424 |  |  |  |  | 25 |  |  |  |  | 386 |  |  |  |  | 24 |  |  |  |  | 38 |  |  |  |  | 1 |  |
Total fixed maturities |  | 17,996 |  |  |  |  | 1,053 |  |  |  |  | 10,914 |  |  |  |  | 523 |  |  |  |  | 7,082 |  |  |  |  | 530 |  |
Perpetual securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Yen-denominated |  | 340 |  |  |  |  | 32 |  |  |  |  | 0 |  |  |  |  | 0 |  |  |  |  | 340 |  |  |  |  | 32 |  |
Total perpetual securities |  | 340 |  |  |  |  | 32 |  |  |  |  | 0 |  |  |  |  | 0 |  |  |  |  | 340 |  |  |  |  | 32 |  |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. dollar-denominated |  | 58 |  |  |  |  | 6 |  |  |  |  | 50 |  |  |  |  | 5 |  |  |  |  | 8 |  |  |  |  | 1 |  |
Yen-denominated |  | 72 |  |  |  |  | 2 |  |  |  |  | 67 |  |  |  |  | 1 |  |  |  |  | 5 |  |  |  |  | 1 |  |
Total equity securities |  | 130 |  |  |  |  | 8 |  |  |  |  | 117 |  |  |  |  | 6 |  |  |  |  | 13 |  |  |  |  | 2 |  |
Total |  | $ | 18,466 |  |  |  |  | $ | 1,093 |  |  |  |  | $ | 11,031 |  |  |  |  | $ | 529 |  |  |  |  | $ | 7,435 |  |  |  |  | $ | 564 |  |
| December 31, 2016
| Total |  | Less than 12 months |  | 12 months or longer
(In millions) | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Fixed Maturities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Japan government and agencies: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Yen-denominated |  | $ | 3,958 |  |  |  |  | $ | 160 |  |  |  |  | $ | 3,958 |  |  |  |  | $ | 160 |  |  |  |  | $ | 0 |  |  |  |  | $ | 0 |  |
Municipalities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. dollar-denominated |  | 44 |  |  |  |  | 8 |  |  |  |  | 0 |  |  |  |  | 0 |  |  |  |  | 44 |  |  |  |  | 8 |  |
Yen-denominated |  | 105 |  |  |  |  | 8 |  |  |  |  | 105 |  |  |  |  | 8 |  |  |  |  | 0 |  |  |  |  | 0 |  |
Mortgage- and asset- backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Yen-denominated |  | 713 |  |  |  |  | 8 |  |  |  |  | 713 |  |  |  |  | 8 |  |  |  |  | 0 |  |  |  |  | 0 |  |
Public utilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. dollar-denominated |  | 1,265 |  |  |  |  | 60 |  |  |  |  | 790 |  |  |  |  | 32 |  |  |  |  | 475 |  |  |  |  | 28 |  |
Yen-denominated |  | 635 |  |  |  |  | 26 |  |  |  |  | 347 |  |  |  |  | 14 |  |  |  |  | 288 |  |  |  |  | 12 |  |
Sovereign and supranational: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Yen-denominated |  | 244 |  |  |  |  | 13 |  |  |  |  | 38 |  |  |  |  | 5 |  |  |  |  | 206 |  |  |  |  | 8 |  |
Banks/financial institutions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. dollar-denominated |  | 268 |  |  |  |  | 16 |  |  |  |  | 238 |  |  |  |  | 10 |  |  |  |  | 30 |  |  |  |  | 6 |  |
Yen-denominated |  | 1,521 |  |  |  |  | 100 |  |  |  |  | 636 |  |  |  |  | 19 |  |  |  |  | 885 |  |  |  |  | 81 |  |
Other corporate: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. dollar-denominated |  | 10,462 |  |  |  |  | 690 |  |  |  |  | 7,252 |  |  |  |  | 346 |  |  |  |  | 3,210 |  |  |  |  | 344 |  |
Yen-denominated |  | 321 |  |  |  |  | 10 |  |  |  |  | 321 |  |  |  |  | 10 |  |  |  |  | 0 |  |  |  |  | 0 |  |
Total fixed maturities |  | 19,536 |  |  |  |  | 1,099 |  |  |  |  | 14,398 |  |  |  |  | 612 |  |  |  |  | 5,138 |  |  |  |  | 487 |  |
Perpetual securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Yen-denominated |  | 479 |  |  |  |  | 49 |  |  |  |  | 85 |  |  |  |  | 1 |  |  |  |  | 394 |  |  |  |  | 48 |  |
Total perpetual securities |  | 479 |  |  |  |  | 49 |  |  |  |  | 85 |  |  |  |  | 1 |  |  |  |  | 394 |  |  |  |  | 48 |  |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. dollar-denominated |  | 211 |  |  |  |  | 6 |  |  |  |  | 211 |  |  |  |  | 6 |  |  |  |  | 0 |  |  |  |  | 0 |  |
Yen-denominated |  | 49 |  |  |  |  | 2 |  |  |  |  | 49 |  |  |  |  | 2 |  |  |  |  | 0 |  |  |  |  | 0 |  |
Total equity securities |  | 260 |  |  |  |  | 8 |  |  |  |  | 260 |  |  |  |  | 8 |  |  |  |  | 0 |  |  |  |  | 0 |  |
Total |  | $ | 20,275 |  |  |  |  | $ | 1,156 |  |  |  |  | $ | 14,743 |  |  |  |  | $ | 621 |  |  |  |  | $ | 5,532 |  |  |  |  | $ | 535 |  |
Other Investments | The table below reflects the composition of the carrying value for other investments as of the periods presented.
(In millions) | September 30, 2017 |  | December 31, 2016
Other investments: |  |  |  |  |  |  |
Commercial mortgage loans |  | $ | 1,199 |  |  |  |  | $ | 855 |  |
Middle market loans |  | 798 |  |  |  |  | 319 |  |
Policy loans |  | 207 |  |  |  |  | 184 |  |
Short-term investments |  | 57 |  |  |  |  | 89 |  |
Other |  | 97 |  |  |  |  | 3 |  |
Total other investments |  | $ | 2,358 |  |  |  |  | $ | 1,450 |  |
Securities Lending Transactions Accounted for as Secured Borrowings | Details of the Company's securities lending activities were as follows:
Securities Lending Transactions Accounted for as Secured Borrowings
September 30, 2017
Remaining Contractual Maturity of the Agreements
(In millions) | Overnight and Continuous(1) |  | Up to 30 days |  |  | Total
Securities lending transactions: |  |  |  |  |  |
Public utilities | $ | 37 |  |  | $ | 0 |  |  |  | $ | 37 |
Banks/financial institutions | 37 |  |  | 0 |  |  |  | 37 |
Other corporate | 434 |  |  | 0 |  |  |  | 434 |
Equity securities | 14 |  |  | 0 |  |  |  | 14 |
Total borrowings | $ | 522 |  |  | $ | 0 |  |  |  | $ | 522 |
Gross amount of recognized liabilities for securities lending transactions |  | $ | 522 |
Amounts related to agreements not included in offsetting disclosure in Note 4 |  | $ | 0 |
(1) These securities are pledged as collateral under the Company's U.S. securities lending program and can be called at its discretion; therefore, they are classified as Overnight and Continuous.
Securities Lending Transactions Accounted for as Secured Borrowings
December 31, 2016
Remaining Contractual Maturity of the Agreements
(In millions) | Overnight and Continuous(1) |  | Up to 30 days |  |  | Total
Securities lending transactions: |  |  |  |  |  |
Public utilities | $ | 62 |  |  | $ | 0 |  |  |  | $ | 62 |
Banks/financial institutions | 34 |  |  | 0 |  |  |  | 34 |
Other corporate | 430 |  |  | 0 |  |  |  | 430 |
Total borrowings | $ | 526 |  |  | $ | 0 |  |  |  | $ | 526 |
Gross amount of recognized liabilities for securities lending transactions |  | $ | 526 |
Amounts related to agreements not included in offsetting disclosure in Note 4 |  | $ | 0 |
(1) These securities are pledged as collateral under the Company's U.S. securities lending program and can be called at its discretion; therefore, they are classified as Overnight and Continuous.
Variable Interest Entity, Consolidated |
Investments in Variable Interest Entities | VIEs - Consolidated The following table presents the cost or amortized cost, fair value and balance sheet caption in which the assets and liabilities of consolidated VIEs are reported. Investments in Consolidated Variable Interest Entities
| September 30, 2017 |  | December 31, 2016
(In millions) | Cost or Amortized Cost |  | Fair Value |  | Cost or Amortized Cost |  | Fair Value
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturities, available for sale |  | $ | 4,274 |  |  |  |  | $ | 5,224 |  |  |  |  | $ | 4,168 |  |  |  |  | $ | 4,982 |  |
Perpetual securities, available for sale |  | 239 |  |  |  |  | 211 |  |  |  |  | 237 |  |  |  |  | 208 |  |
Equity securities |  | 595 |  |  |  |  | 690 |  |  |  |  | 972 |  |  |  |  | 1,044 |  |
Other investments (1) |  | 1,500 |  |  |  |  | 1,491 |  |  |  |  | 819 |  |  |  |  | 789 |  |
Other assets (2) |  | 148 |  |  |  |  | 148 |  |  |  |  | 127 |  |  |  |  | 127 |  |
Total assets of consolidated VIEs |  | $ | 6,756 |  |  |  |  | $ | 7,764 |  |  |  |  | $ | 6,323 |  |  |  |  | $ | 7,150 |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other liabilities (2) |  | $ | 132 |  |  |  |  | $ | 132 |  |  |  |  | $ | 146 |  |  |  |  | $ | 146 |  |
Total liabilities of consolidated VIEs |  | $ | 132 |  |  |  |  | $ | 132 |  |  |  |  | $ | 146 |  |  |  |  | $ | 146 |  |
(1) Consists of CMLs, MMLs, and alternative investments in limited partnerships (2) Consists entirely of derivatives
Variable Interest Entity, Not Consolidated |
Investments in Variable Interest Entities | VIEs-Not Consolidated The table below reflects the amortized cost, fair value and balance sheet caption in which the Company's investment in VIEs not consolidated are reported. Investments in Variable Interest Entities Not Consolidated
| September 30, 2017 |  | December 31, 2016
(In millions) | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturities, available for sale |  | $ | 4,766 |  |  |  |  | $ | 5,439 |  |  |  |  | $ | 4,729 |  |  |  |  | $ | 5,261 |  |
Perpetual securities, available for sale |  | 177 |  |  |  |  | 220 |  |  |  |  | 172 |  |  |  |  | 200 |  |
Fixed maturities, held to maturity |  | 2,645 |  |  |  |  | 3,047 |  |  |  |  | 2,563 |  |  |  |  | 2,948 |  |
Other investments |  | 50 |  |  |  |  | 50 |  |  |  |  | 1 |  |  |  |  | 1 |  |
Total investments in VIEs not consolidated |  | $ | 7,638 |  |  |  |  | $ | 8,756 |  |  |  |  | $ | 7,465 |  |  |  |  | $ | 8,410 |  |

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