Investments | INVESTMENTS Fixed Maturities and Equity Securities The following tables provide information relating to fixed maturities and equity securities (excluding investments classified as trading) as of the dates indicated: March 31, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value OTTI in AOCI(4) (in millions) Fixed maturities, available-for-sale U.S. Treasury securities and obligations of U.S. government authorities and agencies $ 17,364 $ 4,681 $ 1 $ 22,044 $ 0 Obligations of U.S. states and their political subdivisions 8,262 1,022 8 9,276 0 Foreign government bonds 77,878 18,662 64 96,476 0 U.S. corporate public securities 74,007 7,661 1,063 80,605 (12 ) U.S. corporate private securities(1) 28,604 2,318 310 30,612 (17 ) Foreign corporate public securities 26,566 3,162 379 29,349 (4 ) Foreign corporate private securities 19,570 797 719 19,648 0 Asset-backed securities(2) 10,577 164 196 10,545 (444 ) Commercial mortgage-backed securities 10,550 461 7 11,004 (1 ) Residential mortgage-backed securities(3) 4,622 350 2 4,970 (3 ) Total fixed maturities, available-for-sale(1) $ 278,000 $ 39,278 $ 2,749 $ 314,529 $ (481 ) Equity securities, available-for-sale $ 7,026 $ 2,490 $ 116 $ 9,400 March 31, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (in millions) Fixed maturities, held-to-maturity Foreign government bonds $ 872 $ 297 $ 0 $ 1,169 Foreign corporate public securities 663 67 2 728 Foreign corporate private securities(5) 84 4 0 88 Commercial mortgage-backed securities 22 0 0 22 Residential mortgage-backed securities(3) 770 64 0 834 Total fixed maturities, held-to-maturity(5) $ 2,411 $ 432 $ 2 $ 2,841 __________ (1) Excludes notes with amortized cost of $1,050 million (fair value, $1,050 million ) which have been offset with the associated payables under a netting agreement. (2) Includes credit-tranched securities collateralized by sub-prime mortgages, auto loans, credit cards, education loans and other asset types. (3) Includes publicly-traded agency pass-through securities and collateralized mortgage obligations. (4) Represents the amount of other-than-temporary impairment (“OTTI”) losses in Accumulated Other Comprehensive Income (“AOCI”), which were not included in earnings. Amount excludes $680 million of net unrealized gains on impaired available-for-sale securities and less than $1 million of net unrealized gains on impaired held-to-maturity securities relating to changes in the value of such securities subsequent to the impairment measurement date. (5) Excludes notes with amortized cost of $3,990 million (fair value, $3,990 million ) which have been offset with the associated payables under a netting agreement. December 31, 2015 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value OTTI in AOCI(4) (in millions) Fixed maturities, available-for-sale U.S. Treasury securities and obligations of U.S. government authorities and agencies $ 14,992 $ 3,544 $ 19 $ 18,517 $ 0 Obligations of U.S. states and their political subdivisions 8,089 747 41 8,795 0 Foreign government bonds 71,849 12,011 147 83,713 1 U.S. corporate public securities 70,979 6,344 1,955 75,368 (3 ) U.S. corporate private securities(1) 28,525 2,278 359 30,444 0 Foreign corporate public securities 26,354 2,821 621 28,554 0 Foreign corporate private securities 19,393 739 994 19,138 0 Asset-backed securities(2) 10,121 226 121 10,226 (452 ) Commercial mortgage-backed securities 10,337 195 70 10,462 (1 ) Residential mortgage-backed securities(3) 4,777 335 6 5,106 (4 ) Total fixed maturities, available-for-sale(1) $ 265,416 $ 29,240 $ 4,333 $ 290,323 $ (459 ) Equity securities, available-for-sale $ 6,847 $ 2,570 $ 143 $ 9,274 December 31, 2015 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (in millions) Fixed maturities, held-to-maturity Foreign government bonds $ 816 $ 196 $ 0 $ 1,012 Foreign corporate public securities 625 62 0 687 Foreign corporate private securities(5) 78 4 0 82 Commercial mortgage-backed securities 33 1 0 34 Residential mortgage-backed securities(3) 756 53 0 809 Total fixed maturities, held-to-maturity(5) $ 2,308 $ 316 $ 0 $ 2,624 __________ (1) Excludes notes with amortized cost of $1,050 million (fair value, $1,039 million ) which have been offset with the associated payables under a netting agreement. (2) Includes credit-tranched securities collateralized by sub-prime mortgages, auto loans, credit cards, education loans and other asset types. (3) Includes publicly-traded agency pass-through securities and collateralized mortgage obligations. (4) Represents the amount of OTTI losses in AOCI, which were not included in earnings. Amount excludes $693 million of net unrealized gains on impaired available-for-sale securities and less than $1 million of net unrealized gains on impaired held-to-maturity securities relating to changes in the value of such securities subsequent to the impairment measurement date. (5) Excludes notes with amortized cost of $3,850 million (fair value, $4,081 million ) which have been offset with the associated payables under a netting agreement. The amortized cost and fair value of fixed maturities by contractual maturities at March 31, 2016 , are as follows: Available-for-Sale Held-to-Maturity Amortized Cost Fair Value Amortized Cost Fair Value (in millions) Due in one year or less $ 14,423 $ 15,147 $ 7 $ 7 Due after one year through five years 49,178 53,605 71 75 Due after five years through ten years 56,420 62,024 673 738 Due after ten years(1) 132,230 157,234 868 1,165 Asset-backed securities 10,577 10,545 0 0 Commercial mortgage-backed securities 10,550 11,004 22 22 Residential mortgage-backed securities 4,622 4,970 770 834 Total $ 278,000 $ 314,529 $ 2,411 $ 2,841 __________ (1) Excludes available-for-sale notes with amortized cost of $1,050 million (fair value, $1,050 million ) and held-to-maturity notes with amortized cost of $3,990 million (fair value, $3,990 million ), which have been offset with the associated payables under a netting agreement. Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations. Asset-backed, commercial mortgage-backed and residential mortgage-backed securities are shown separately in the table above, as they are not due at a single maturity date. The following table depicts the sources of fixed maturity and equity security proceeds and related investment gains (losses), as well as losses on impairments of both fixed maturities and equity securities: Three Months Ended 2016 2015 (in millions) Fixed maturities, available-for-sale Proceeds from sales $ 5,122 $ 7,418 Proceeds from maturities/repayments 4,037 5,095 Gross investment gains from sales, prepayments and maturities 295 532 Gross investment losses from sales and maturities (242 ) (56 ) Fixed maturities, held-to-maturity Gross investment gains from prepayments $ 0 $ 0 Proceeds from maturities/repayments 50 60 Equity securities, available-for-sale Proceeds from sales $ 941 $ 989 Gross investment gains from sales 110 153 Gross investment losses from sales (71 ) (26 ) Fixed maturity and equity security impairments Net writedowns for OTTI losses on fixed maturities recognized in earnings(1) $ (126 ) $ (8 ) Writedowns for impairments on equity securities (11 ) (6 ) __________ (1) Excludes the portion of OTTI recorded in “Other comprehensive income (loss),” representing any difference between the fair value of the impaired debt security and the net present value of its projected future cash flows at the time of impairment. As discussed in Note 2 to the Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015 , a portion of certain OTTI losses on fixed maturity securities is recognized in “Other comprehensive income (loss)” (“OCI”). For these securities, the net amount recognized in earnings (“credit loss impairments”) represents the difference between the amortized cost of the security and the net present value of its projected future cash flows discounted at the effective interest rate implicit in the debt security prior to impairment. Any remaining difference between the fair value and amortized cost is recognized in OCI. The following table sets forth the amount of pre-tax credit loss impairments on fixed maturity securities held by the Company as of the dates indicated, for which a portion of the OTTI loss was recognized in OCI, and the corresponding changes in such amounts: Three Months Ended 2016 2015 (in millions) Balance, beginning of period $ 532 $ 781 Credit loss impairments previously recognized on securities which matured, paid down, prepaid or were sold during the period (10 ) (13 ) Credit loss impairments previously recognized on securities impaired to fair value during the period(1) (2 ) (1 ) Credit loss impairments recognized in the current period on securities not previously impaired 20 2 Additional credit loss impairments recognized in the current period on securities previously impaired 0 0 Increases due to the passage of time on previously recorded credit losses 5 7 Accretion of credit loss impairments previously recognized due to an increase in cash flows expected to be collected (2 ) (3 ) Balance, end of period $ 543 $ 773 __________ (1) Represents circumstances where the Company determined in the current period that it intends to sell the security or it is more likely than not that it will be required to sell the security before recovery of the security’s amortized cost. Trading Account Assets Supporting Insurance Liabilities The following table sets forth the composition of “Trading account assets supporting insurance liabilities” as of the dates indicated: March 31, 2016 December 31, 2015 Amortized Cost Fair Value Amortized Cost Fair Value (in millions) Short-term investments and cash equivalents $ 888 $ 888 $ 765 $ 765 Fixed maturities: Corporate securities 13,142 13,450 12,797 12,851 Commercial mortgage-backed securities 1,865 1,922 1,860 1,862 Residential mortgage-backed securities(1) 1,356 1,393 1,411 1,428 Asset-backed securities(2) 1,378 1,377 1,295 1,299 Foreign government bonds 738 773 680 694 U.S. government authorities and agencies and obligations of U.S. states 390 435 326 369 Total fixed maturities 18,869 19,350 18,369 18,503 Equity securities 1,093 1,209 1,030 1,254 Total trading account assets supporting insurance liabilities $ 20,850 $ 21,447 $ 20,164 $ 20,522 __________ (1) Includes publicly-traded agency pass-through securities and collateralized mortgage obligations. (2) Includes credit-tranched securities collateralized by sub-prime mortgages, auto loans, credit cards, education loans and other asset types. The net change in unrealized gains (losses) from trading account assets supporting insurance liabilities still held at period end, recorded within “Other income,” was $239 million and $10 million during the three months ended March 31, 2016 and 2015 , respectively. Other Trading Account Assets The following table sets forth the composition of the “Other trading account assets” as of the dates indicated: March 31, 2016 December 31, 2015 Amortized Cost Fair Value Amortized Cost Fair Value (in millions) Short-term investments and cash equivalents $ 26 $ 26 $ 26 $ 26 Fixed maturities 5,250 4,923 11,132 10,764 Equity securities 967 1,045 1,006 1,098 Other 5 5 12 15 Subtotal $ 6,248 5,999 $ 12,176 11,903 Derivative instruments 2,053 2,555 Total other trading account assets $ 8,052 $ 14,458 The net change in unrealized gains (losses) from other trading account assets, excluding derivative instruments, still held at period end, recorded within “Other income,” was $24 million and $(52) million during the three months ended March 31, 2016 and 2015 , respectively. Concentrations of Financial Instruments The Company monitors its concentrations of financial instruments and mitigates credit risk by maintaining a diversified investment portfolio which limits exposure to any one issuer. As of both March 31, 2016 and December 31, 2015 , the Company’s exposure to concentrations of credit risk of single issuers greater than 10% of the Company’s stockholders’ equity included securities of the U.S. government and certain U.S. government agencies and certain securities guaranteed by the U.S. government, as well as the securities disclosed below . March 31, 2016 December 31, 2015 Amortized Cost Fair Value Amortized Cost Fair Value (in millions) Investments in Japanese government and government agency securities: Fixed maturities, available-for-sale $ 59,184 $ 73,099 $ 53,851 $ 61,911 Fixed maturities, held-to-maturity 850 1,141 796 988 Trading account assets supporting insurance liabilities 541 573 492 502 Other trading account assets 33 34 33 33 Short-term investments 0 0 0 0 Cash equivalents 0 0 0 0 Total $ 60,608 $ 74,847 $ 55,172 $ 63,434 March 31, 2016 December 31, 2015 Amortized Cost Fair Value Amortized Cost Fair Value (in millions) Investments in South Korean government and government agency securities: Fixed maturities, available-for-sale $ 7,490 $ 9,960 $ 7,191 $ 9,233 Fixed maturities, held-to-maturity 0 0 0 0 Trading account assets supporting insurance liabilities 44 45 44 44 Other trading account assets 7 7 0 0 Short-term investments 0 0 0 0 Cash equivalents 0 0 0 0 Total $ 7,541 $ 10,012 $ 7,235 $ 9,277 Commercial Mortgage and Other Loans The Company’s commercial mortgage and other loans are comprised as follows, as of the dates indicated: March 31, 2016 December 31, 2015 Amount (in millions) % of Total Amount (in millions) % of Total Commercial mortgage and agricultural property loans by property type: Office $ 11,517 23.4 % $ 11,226 22.9 % Retail 8,493 17.2 8,917 18.2 Apartments/Multi-Family 12,493 25.4 12,034 24.5 Industrial 7,703 15.6 7,775 15.9 Hospitality 2,396 4.9 2,513 5.1 Other 3,811 7.7 3,722 7.6 Total commercial mortgage loans 46,413 94.2 46,187 94.2 Agricultural property loans 2,842 5.8 2,859 5.8 Total commercial mortgage and agricultural property loans by property type 49,255 100.0 % 49,046 100.0 % Valuation allowance (89 ) (99 ) Total net commercial mortgage and agricultural property loans by property type 49,166 48,947 Other loans: Uncollateralized loans 1,022 1,012 Residential property loans 307 301 Other collateralized loans 312 312 Total other loans 1,641 1,625 Valuation allowance (9 ) (13 ) Total net other loans 1,632 1,612 Total commercial mortgage and other loans(1) $ 50,798 $ 50,559 __________ (1) Includes loans held at fair value. The commercial mortgage and agricultural property loans are geographically dispersed throughout the United States (with the largest concentrations in California (27%) , New York (9%) and Texas (9%) ) and include loans secured by properties in Europe (4%) and Asia (1%) at March 31, 2016 . Activity in the allowance for credit losses for all commercial mortgage and other loans, as of the dates indicated, is as follows: March 31, 2016 Commercial Mortgage Loans Agricultural Property Loans Residential Property Loans Other Collateralized Loans Uncollateralized Loans Total (in millions) Allowance for credit losses, beginning of year $ 97 $ 2 $ 3 $ 0 $ 10 $ 112 Addition to (release of) allowance for losses (10 ) 0 0 0 (5 ) (15 ) Charge-offs, net of recoveries 0 0 0 0 0 0 Change in foreign exchange 0 0 0 0 1 1 Total ending balance $ 87 $ 2 $ 3 $ 0 $ 6 $ 98 December 31, 2015 Commercial Mortgage Loans Agricultural Property Loans Residential Property Loans Other Collateralized Loans Uncollateralized Loans Total (in millions) Allowance for credit losses, beginning of year $ 104 $ 1 $ 5 $ 0 $ 9 $ 119 Addition to (release of) allowance for losses (7 ) 1 (2 ) 0 1 (7 ) Charge-offs, net of recoveries 0 0 0 0 0 0 Change in foreign exchange 0 0 0 0 0 0 Total ending balance $ 97 $ 2 $ 3 $ 0 $ 10 $ 112 The following tables set forth the allowance for credit losses and the recorded investment in commercial mortgage and other loans as of the dates indicated: March 31, 2016 Commercial Mortgage Loans Agricultural Property Loans Residential Property Loans Other Collateralized Loans Uncollateralized Loans Total (in millions) Allowance for Credit Losses: Individually evaluated for impairment $ 1 $ 0 $ 0 $ 0 $ 0 $ 1 Collectively evaluated for impairment 86 2 3 0 6 97 Loans acquired with deteriorated credit quality 0 0 0 0 0 0 Total ending balance $ 87 $ 2 $ 3 $ 0 $ 6 $ 98 Recorded Investment(1): Gross of reserves: individually evaluated for impairment $ 100 $ 26 $ 0 $ 0 $ 2 $ 128 Gross of reserves: collectively evaluated for impairment 46,313 2,816 307 312 1,020 50,768 Gross of reserves: loans acquired with deteriorated credit quality 0 0 0 0 0 0 Total ending balance, gross of reserves $ 46,413 $ 2,842 $ 307 $ 312 $ 1,022 $ 50,896 __________ (1) Recorded investment reflects the carrying value gross of related allowance. December 31, 2015 Commercial Mortgage Loans Agricultural Property Loans Residential Property Loans Other Collateralized Loans Uncollateralized Loans Total (in millions) Allowance for Credit Losses: Individually evaluated for impairment $ 1 $ 0 $ 0 $ 0 $ 0 $ 1 Collectively evaluated for impairment 96 2 3 0 10 111 Loans acquired with deteriorated credit quality 0 0 0 0 0 0 Total ending balance $ 97 $ 2 $ 3 $ 0 $ 10 $ 112 Recorded Investment(1): Gross of reserves: individually evaluated for impairment $ 111 $ 8 $ 0 $ 0 $ 2 $ 121 Gross of reserves: collectively evaluated for impairment 46,076 2,851 301 312 1,010 50,550 Gross of reserves: loans acquired with deteriorated credit quality 0 0 0 0 0 0 Total ending balance, gross of reserves $ 46,187 $ 2,859 $ 301 $ 312 $ 1,012 $ 50,671 __________ (1) Recorded investment reflects the carrying value gross of related allowance. Impaired loans include those loans for which it is probable that all amounts due will not be collected according to the contractual terms of the loan agreement. Impaired commercial mortgage and other loans identified in management’s specific review of probable loan losses and the related allowance for losses, as of the dates indicated, are as follows: March 31, 2016 Recorded Investment(1) Unpaid Principal Balance Related Allowance Average Recorded Investment Before Allowance(2) Interest Income Recognized(3) (in millions) With no related allowance recorded: Commercial mortgage loans $ 0 $ 0 $ 0 $ 0 $ 0 Agricultural property loans 0 0 0 1 0 Residential property loans 0 0 0 0 0 Other collateralized loans 0 0 0 0 0 Uncollateralized loans 0 2 0 0 0 Total with no related allowance $ 0 $ 2 $ 0 $ 1 $ 0 With an allowance recorded: Commercial mortgage loans $ 4 $ 4 $ 1 $ 5 $ 0 Agricultural property loans 0 0 0 0 0 Residential property loans 0 0 0 0 0 Other collateralized loans 0 0 0 0 0 Uncollateralized loans 0 0 0 0 0 Total with related allowance $ 4 $ 4 $ 1 $ 5 $ 0 Total: Commercial mortgage loans $ 4 $ 4 $ 1 $ 5 $ 0 Agricultural property loans 0 0 0 1 0 Residential property loans 0 0 0 0 0 Other collateralized loans 0 0 0 0 0 Uncollateralized loans 0 2 0 0 0 Total $ 4 $ 6 $ 1 $ 6 $ 0 __________ (1) Recorded investment reflects the carrying value gross of related allowance. (2) Average recorded investment represents the average of the beginning-of-period and end-of-period balances. (3) The interest income recognized is for the year-to-date income regardless of when the impairments occurred. December 31, 2015 Recorded Investment(1) Unpaid Principal Balance Related Allowance Average Recorded Investment Before Allowance(2) Interest Income Recognized(3) (in millions) With no related allowance recorded: Commercial mortgage loans $ 0 $ 0 $ 0 $ 0 $ 0 Agricultural property loans 0 0 0 2 0 Residential property loans 0 0 0 0 0 Other collateralized loans 0 0 0 0 0 Uncollateralized loans 0 1 0 0 0 Total with no related allowance $ 0 $ 1 $ 0 $ 2 $ 0 With an allowance recorded: Commercial mortgage loans $ 1 $ 1 $ 1 $ 52 $ 3 Agricultural property loans 0 0 0 0 0 Residential property loans 0 0 0 0 0 Other collateralized loans 0 0 0 0 0 Uncollateralized loans 0 0 0 0 0 Total with related allowance $ 1 $ 1 $ 1 $ 52 $ 3 Total: Commercial mortgage loans $ 1 $ 1 $ 1 $ 52 $ 3 Agricultural property loans 0 0 0 2 0 Residential property loans 0 0 0 0 0 Other collateralized loans 0 0 0 0 0 Uncollateralized loans 0 1 0 0 0 Total $ 1 $ 2 $ 1 $ 54 $ 3 __________ (1) Recorded investment reflects the carrying value gross of related allowance. (2) Average recorded investment represents the average of the beginning-of-period and all subsequent quarterly end-of-period balances. (3) The interest income recognized is for the year-to-date income regardless of when the impairments occurred. The net carrying value of commercial and other loans held for sale by the Company as of March 31, 2016 and December 31, 2015 , was $286 million and $274 million , respectively. For all of these loans, the Company pre-arranges that it will sell the loan to an investor. As of both March 31, 2016 and December 31, 2015 , all of the Company’s commercial and other loans held for sale were collateralized, with collateral primarily consisting of apartment complexes. The following tables set forth certain key credit quality indicators as of March 31, 2016 , based upon the recorded investment gross of allowance for credit losses. Commercial mortgage loans Debt Service Coverage Ratio—March 31, 2016 Greater than 1.2X 1.0X to <1.2X Less than 1.0X Total (in millions) Loan-to-Value Ratio 0%-59.99% $ 25,875 $ 458 $ 212 $ 26,545 60%-69.99% 12,355 559 290 13,204 70%-79.99% 6,007 289 59 6,355 Greater than 80% 128 155 26 309 Total commercial mortgage loans $ 44,365 $ 1,461 $ 587 $ 46,413 Agricultural property loans Debt Service Coverage Ratio—March 31, 2016 Greater than 1.2X 1.0X to <1.2X Less than 1.0X Total (in millions) Loan-to-Value Ratio 0%-59.99% $ 2,540 $ 116 $ 3 $ 2,659 60%-69.99% 183 0 0 183 70%-79.99% 0 0 0 0 Greater than 80% 0 0 0 0 Total agricultural property loans $ 2,723 $ 116 $ 3 $ 2,842 Total commercial mortgage and agricultural property loans Debt Service Coverage Ratio—March 31, 2016 Greater than 1.0X to <1.2X Less than Total (in millions) Loan-to-Value Ratio 0%-59.99% $ 28,415 $ 574 $ 215 $ 29,204 60%-69.99% 12,538 559 290 13,387 70%-79.99% 6,007 289 59 6,355 Greater than 80% 128 155 26 309 Total commercial mortgage and agricultural property loans $ 47,088 $ 1,577 $ 590 $ 49,255 The following tables set forth certain key credit quality indicators as of December 31, 2015 , based upon the recorded investment gross of allowance for credit losses. Commercial mortgage loans Debt Service Coverage Ratio—December 31, 2015 Greater than 1.2X 1.0X to <1.2X Less than 1.0X Total (in millions) Loan-to-Value Ratio 0%-59.99% $ 25,978 $ 515 $ 207 $ 26,700 60%-69.99% 12,191 395 234 12,820 70%-79.99% 5,668 500 97 6,265 Greater than 80% 119 151 132 402 Total commercial mortgage loans $ 43,956 $ 1,561 $ 670 $ 46,187 Agricultural property loans Debt Service Coverage Ratio—December 31, 2015 Greater than 1.2X 1.0X to <1.2X Less than 1.0X Total (in millions) Loan-to-Value Ratio 0%-59.99% $ 2,587 $ 84 $ 3 $ 2,674 60%-69.99% 185 0 0 185 70%-79.99% 0 0 0 0 Greater than 80% 0 0 0 0 Total agricultural property loans $ 2,772 $ 84 $ 3 $ 2,859 Total commercial mortgage and agricultural property loans Debt Service Coverage Ratio—December 31, 2015 Greater than 1.2X 1.0X to <1.2X Less than 1.0X Total (in millions) Loan-to-Value Ratio 0%-59.99% $ 28,565 $ 599 $ 210 $ 29,374 60%-69.99% 12,376 395 234 13,005 70%-79.99% 5,668 500 97 6,265 Greater than 80% 119 151 132 402 Total commercial mortgage and agricultural property loans $ 46,728 $ 1,645 $ 673 $ 49,046 The following tables provide an aging of past due commercial mortgage and other loans as of the dates indicated, based upon the recorded investment gross of allowance for credit losses, as well as the amount of commercial mortgage loans on nonaccrual status as of the dates indicated. March 31, 2016 Current 30-59 Days Past Due 60-89 Days Past Due Greater Than 90 Days - Accruing Greater Than 90 Days - Not Accruing Total Past Due Total Commercial Mortgage and Other Loans Non Accrual Status (in millions) Commercial mortgage loans $ 46,409 $ 4 $ 0 $ 0 $ 0 $ 4 $ 46,413 $ 48 Agricultural property loans 2,839 0 0 0 3 3 2,842 3 Residential property loans 293 7 1 0 6 14 307 6 Other collateralized loans 312 0 0 0 0 0 312 0 Uncollateralized loans 1,022 0 0 0 0 0 1,022 0 Total $ 50,875 $ 11 $ 1 $ 0 $ 9 $ 21 $ 50,896 $ 57 December 31, 2015 Current 30-59 Days Past Due 60-89 Days Past Due Greater Than 90 Days - Accruing Greater Than 90 Days - Not Accruing Total Past Due Total Commercial Mortgage and Other Loans Non Accrual Status (in millions) Commercial mortgage loans $ 46,187 $ 0 $ 0 $ 0 $ 0 $ 0 $ 46,187 $ 53 Agricultural property loans 2,856 2 0 0 1 3 2,859 1 Residential property loans 288 7 0 0 6 13 301 6 Other collateralized loans 312 0 0 0 0 0 312 0 Uncollateralized loans 1,012 0 0 0 0 0 1,012 0 Total $ 50,655 $ 9 $ 0 $ 0 $ 7 $ 16 $ 50,671 $ 60 See Note 2 to the Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015 , for further discussion regarding nonaccrual status loans. For the three months ended March 31, 2016 and 2015 , there were no commercial mortgage and other loans acquired, other than those through direct origination. For the three months ended March 31, 2016 and 2015 , there were no commercial mortgage and other loans sold, other than those classified as held for sale. The Company’s commercial mortgage and other loans may occasionally be involved in a troubled debt restructuring. As of March 31, 2016 and December 31, 2015 , the Company had no significant commitments to borrowers that have been involved in a troubled debt restructuring. During three months ended March 31, 2016 and 2015 , there were no new troubled debt restructurings related to commercial mortgage and other loans, and no payment defaults on commercial mortgage and other loans that were modified as a troubled debt restructuring within the twelve months preceding. For additional information relating to the accounting for troubled debt restructurings, see Note 2 to the Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015 . As of March 31, 2016 and December 31, 2015 , there were $0 and $22 million , respectively, of private debt commitments to borrowers that have been involved in a troubled debt restructuring. As of March 31, 2016 and December 31, 2015 , the Company did not have any foreclosed residential real estate property. Net Investment Income Net investment income for the three months ended March 31, 2016 and 2015 , was from the following sources: Three Months Ended 2016 2015 (in millions) Fixed maturities, available-for-sale(1) $ 2,623 $ 2,582 Fixed maturities, held-to-maturity(1) 51 48 Equity securities, available-for-sale 79 96 Trading account assets 254 287 Commercial mortgage and other loans 555 545 Policy loans 154 154 Short-term investments and cash equivalents 33 13 Other long-term investments 99 244 Gross investment income 3,848 3,969 Less: investment expenses (178 ) (200 ) Net investment income $ 3,670 $ 3,769 __________ (1) Includes income on credit-linked notes which are reported on the same financial statement line item as related surplus notes, as conditions are met for right to offset. Realized Investment Gains (Losses), Net Realized investment gains (losses), net, for the three months ended March 31, 2016 and 2015 , were from the following sources: Three Months Ended 2016 2015 (in millions) Fixed maturities $ (73 ) $ 468 Equity securities 28 121 Commercial mortgage and other loans 27 11 Investment real estate 0 25 Joint ventures and limited partnerships (41 ) (5 ) Derivatives(1) 1,944 1,738 Other (4 ) 3 Realized investment gains (losses), net $ 1,881 $ 2,361 __________ (1) Includes the offset of hedged items in qualifying effective hedge relationships prior to maturity or termination. Net Unrealized Gains (Losses) on Investments by Asset Class The table below presents net unrealized gains (losses) on investments by asset class as of the dates indicated: March 31, December 31, (in millions) Fixed maturity securities on which an OTTI loss has been recognized $ 199 $ 234 Fixed maturity securities, available-for-sale—all other 36,330 24,673 Equity securities, available-for-sale 2,374 2,427 Derivatives designated as cash flow hedges(1) 896 1,165 Other investments(2) (16 ) (25 ) Net unrealized gains (losses) on investments $ 39,783 $ 28,474 __________ (1) See Note 14 for more information on cash flow hedges. (2) As of March 31, 2016 , there were $0 million of net unrealized losses on held-to-maturity securities that were previously transferred from available-for-sale. Includes net unrealized gains on certain joint ventures that are strategic in nature and are included in “Other assets” and losses on notes associated with payables under a netting agreement. Duration of Gross Unrealized Loss Positions for Fixed Maturities and Equity Securities The following table shows the fair value and gross unrealized losses aggregated by investment category and length of time that individual fixed maturity securities and equity securities have been in a continuous unrealized loss position, as of the dates indicated: March 31, 2016 Less than Twelve months or more Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses (in millions) Fixed maturities(1) U.S. Treasury securities and obligations of U.S. government authorities and agencies $ 81 $ 1 $ 7 $ 0 $ 88 $ 1 Obligations of U.S. states and their political subdivisions 98 0 193 8 291 8 Foreign government bonds 527 12 463 52 990 64 U.S. corporate public securities 7,263 376 8,525 687 15,788 1,063 U.S. corporate private securities 4,880 227 998 83 5,878 310 Foreign corporate public securities 2,545 125 2,077 256 4,622 381 Foreign corporate private securities 4,358 251 4,411 468 8,769 719 Asset-backed securities 4,587 90 3,082 106 7,669 196 Commercial mortgage-backed securities 698 3 485 4 1,183 7 Residential mortgage-backed securities 65 0 155 2 220 2 Total $ 25,102 $ 1,085 $ 20,396 $ 1,666 $ 45,498 $ 2,751 Equity securities, available-for-sale $ 1,462 $ 115 $ 6 $ 1 $ 1,468 $ 116 __________ (1) Includes $50 million of fair value and $2 million of gross unrealized losses at March 31, 2016 , on securities classified as held-to-maturity, a portion of which is not reflected in AOCI. December 31, 2015 Less than twelve months Twelve months or more Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses (in millions) Fixed maturities(1) U.S. Treasury securities and obligations of U.S. government authorities and agencies $ 3,068 $ 19 $ 0 $ 0 $ 3,068 $ 19 Obligations of U.S. states and their political subdivisions 1,391 40 7 1 1,398 41 Foreign government bonds 1,925 82 411 65 2,336 147 U.S. corporate public securities 24,642 1,396 3,455 559 28,097 1,955 U.S. corporate private securities 6,996 266 802 93 7,798 359 Foreign corporate public securities 5,985 288 1,584 333 7,569 621 Foreign corporate private securities 6,199 340 3,917 654 10,116 994 Asset-backed securities 4,342 33 3,138 88 7,480 121 Commercial mortgage-backed securities 3,888 63 473 7 4,361 70 Residential mortgage-backed securities 558 4 119 2 677 6 Total $ 58,994 $ 2,531 $ 13,906 $ 1,802 $ 72,900 $ 4,333 Equity securities, available-for-sale $ 1,862 $ 142 $ 11 $ 1 $ 1,873 $ 143 __________ (1) Includes $0 million of fair value and $0 million of gross unrealized losses at December 31, 2015 , on securities classified as held-to-maturity, which is not reflected in AOCI. The gross unrealized losses on fixed maturity securities at March 31, 2016 and December 31, 2015 , were composed of $2,039 million and $3,750 million , respectively, related to high or highest quality securities based on the National Association of Insurance Commissioners (“NAIC”) or equivalent rating and $712 million and $583 million , respectively, related to other than high or highest quality securities based on NAIC or equivalent rating. At March 31, 2016 , the $1,666 million of gross unrealized losses of twelve months or more were concentrated in the energy, consumer non-cyclical and utility sectors of the Company’s corporate securities. At December 31, 2015 , the $1,802 million of gross unrealized losses of twelve months or more were concentrated in the energy, consumer non-cyclical and basic industry sectors of the Company’s corporate securities. In accordance with its policy described in Note 2 to the Consolidated Financial Statements include |