MetLife, Inc. Notes to the Consolidated Financial Statements — (Continued) The following tables summarize the change of all assets and (liabilities) measured at estimated fair value on a recurring basis using significant unobservable inputs (Level 3), including realized and unrealized gains (losses) of all assets and (liabilities) and realized and unrealized gains (losses) of all assets and (liabilities) still held at the end of the respective periods: 150 Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Fixed Maturity Securities: U.S. Corporate Foreign Corporate Foreign Government U.S. Treasury and Agency RMBS CMBS ABS State and Political Subdivision Other (In millions) Year Ended December 31, 2012: Balance, January 1, ...............$ 6,784 $ 4,370 $ 2,322 $ 31 $ 1,602 $ 753 $ 1,850 $ 53 $ — Total realized/unrealized gains (losses) included in: .............. Net income (loss): (1), (2) ......... Net investment income ......... 14 20 14 — 27 8 18 — — Net investment gains (losses) .... 4 (78) (3) — (7) (42) 2 — — Net derivative gains (losses) ..... — — — — — — — — — Other revenues ............... — — — — — — — — — Policyholder benefits and claims . . — — — — — — — — — Other expenses ............... — — — — — — — — — Other comprehensive income (loss) ....................... 328 294 45 — 275 (4) (2) 3 — Purchases (3) .................... 1,718 2,654 431 48 952 682 2,007 5 — Sales (3) ........................ (1,207) (855) (673) (8) (704) (397) (177) (7) — Issuances (3) ..................... — — — — — — — — — Settlements (3) ................... — — — — — — — — — Transfers into Level 3 (4) ............ 661 186 28 — 161 177 6 — — Transfers out of Level 3 (4) .......... (869) (383) (350) — (269) (30) (48) — — Balance, December 31, ............$ 7,433 $ 6,208 $ 1,814 $ 71 $ 2,037 $ 1,147 $ 3,656 $ 54 $ — Changes in unrealized gains (losses) included in net income (loss): (5) .... Net investment income .........$ 12 $ 19 $ 16 $ — $ 27 $ 2 $ 18 $ — $ — Net investment gains (losses) ....$ (4) $ (30) $ — $ — $ (4) $ (1) $ — $ — $ — Net derivative gains (losses) .....$ — $ — $ — $ — $ — $ — $ — $ — $ — Other revenues ...............$ — $ — $ — $ — $ — $ — $ — $ — $ — Policyholder benefits and claims . . $ — $ — $ — $ — $ — $ — $ — $ — $ — Other expenses ...............$ — $ — $ — $ — $ — $ — $ — $ — $ — MetLife, Inc.