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Investments | 3 Months Ended
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Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
Investments | Investments Available-for-sale investments The amortized cost, gross unrealized gains, gross unrealized losses and fair values of available-for-sale investments by type of security were as follows (in millions):
Type of security as of March 31, 2018 |  | Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
U.S. Treasury securities |  | $ | 5,207 |  |  | $ | — |  |  | $ | (104 | ) |  | $ | 5,103 |
Other government-related debt securities: |  |  |  |  |  |  |  |
U.S. |  | 132 |  |  | — |  |  | (3 | ) |  | 129 |
Foreign and other |  | 1,714 |  |  | 3 |  |  | (43 | ) |  | 1,674 |
Corporate debt securities: |  |  |  |  |  |  |  |
Financial |  | 6,189 |  |  | 1 |  |  | (137 | ) |  | 6,053 |
Industrial |  | 5,687 |  |  | 6 |  |  | (128 | ) |  | 5,565 |
Other |  | 916 |  |  | 1 |  |  | (21 | ) |  | 896 |
Residential-mortgage-backed securities |  | 1,745 |  |  | — |  |  | (46 | ) |  | 1,699 |
Other mortgage- and asset-backed securities |  | 1,293 |  |  | — |  |  | (26 | ) |  | 1,267 |
Money market mutual funds |  | 9,234 |  |  | — |  |  | — |  |  | 9,234 |
Other short-term interest-bearing securities |  | 50 |  |  | — |  |  | — |  |  | 50 |
Total available-for-sale investments |  | $ | 32,167 |  |  | $ | 11 |  |  | $ | (508 | ) |  | $ | 31,670 |
Type of security as of December 31, 2017 |  | Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
U.S. Treasury securities |  | $ | 8,313 |  |  | $ | 1 |  |  | $ | (72 | ) |  | $ | 8,242 |
Other government-related debt securities: |  |  |  |  |  |  |  |
U.S. |  | 225 |  |  | — |  |  | (2 | ) |  | 223 |
Foreign and other |  | 2,415 |  |  | 18 |  |  | (11 | ) |  | 2,422 |
Corporate debt securities: |  |  |  |  |  |  |  |
Financial |  | 10,089 |  |  | 17 |  |  | (34 | ) |  | 10,072 |
Industrial |  | 9,688 |  |  | 34 |  |  | (52 | ) |  | 9,670 |
Other |  | 1,393 |  |  | 3 |  |  | (6 | ) |  | 1,390 |
Residential-mortgage-backed securities |  | 2,198 |  |  | — |  |  | (30 | ) |  | 2,168 |
Other mortgage- and asset-backed securities |  | 2,312 |  |  | — |  |  | (15 | ) |  | 2,297 |
Money market mutual funds |  | 3,245 |  |  | — |  |  | — |  |  | 3,245 |
Other short-term interest-bearing securities |  | 1,440 |  |  | — |  |  | — |  |  | 1,440 |
Total interest-bearing securities |  | 41,318 |  |  | 73 |  |  | (222 | ) |  | 41,169 |
Equity securities |  | 135 |  |  | 14 |  |  | — |  |  | 149 |
Total available-for-sale investments |  | $ | 41,453 |  |  | $ | 87 |  |  | $ | (222 | ) |  | $ | 41,318 |
The fair values of available-for-sale investments by location in the Condensed Consolidated Balance Sheets were as follows (in millions):
Condensed Consolidated Balance Sheets location |  | March 31, 2018 |  | December 31, 2017
Cash and cash equivalents |  | $ | 9,239 |  |  | $ | 3,291 |
Marketable securities |  | 22,431 |  |  | 37,878 |
Other assets |  | — |  |  | 149 |
Total available-for-sale investments |  | $ | 31,670 |  |  | $ | 41,318 |
Cash and cash equivalents in the above table excludes bank account cash of $502 million and $509 million as of March 31, 2018 and December 31, 2017, respectively. Other assets as of December 31, 2017, consisted of equity securities, which are no longer classified as available-for-sale. As a result of the adoption of the new accounting standard related to the classification and measurement of financial instruments on January 1, 2018, equity investments (except for investments accounted for under the equity method of accounting) are now measured at fair value, with changes in fair value recognized in earnings. These investments were previously measured at fair value, with changes in fair value recognized in AOCI. Accordingly, these securities are no longer classified as available-for-sale and their presentation is not comparable to the presentation as of December 31, 2017. See Note 1, Summary of significant accounting policies, as well as Equity securities discussed below. The fair values of available-for-sale interest-bearing security investments by contractual maturity, except for mortgage- and asset-backed securities that do not have a single maturity date, were as follows (in millions):
Contractual maturity |  | March 31, 2018 |  | December 31, 2017
Maturing in one year or less |  | $ | 9,403 |  |  | $ | 6,733 |
Maturing after one year through three years |  | 6,579 |  |  | 12,820 |
Maturing after three years through five years |  | 10,934 |  |  | 13,836 |
Maturing after five years through ten years |  | 1,788 |  |  | 3,263 |
Maturing after ten years |  | — |  |  | 52 |
Mortgage- and asset-backed securities |  | 2,966 |  |  | 4,465 |
Total interest-bearing securities |  | $ | 31,670 |  |  | $ | 41,169 |
For the three months ended March 31, 2018 and 2017, realized gains on interest-bearing securities were $17 million and $31 million, respectively, and realized losses on interest-bearing securities were $151 million and $84 million, respectively. The cost of securities sold is based on the specific-identification method. The fair values and gross unrealized losses of available-for-sale investments in an unrealized loss position aggregated by type and length of time that the securities have been in a continuous loss position were as follows (in millions):
|  | Less than 12 months |  | 12 months or more
Type of security as of March 31, 2018 |  | Fair value |  | Unrealized losses |  | Fair value |  | Unrealized losses
U.S. Treasury securities |  | $ | 5,023 |  |  | $ | (103 | ) |  | $ | 53 |  |  | $ | (1 | )
Other government-related debt securities: |  |  |  |  |  |  |  |
U.S. |  | 103 |  |  | (2 | ) |  | 26 |  |  | (1 | )
Foreign and other |  | 1,367 |  |  | (39 | ) |  | 88 |  |  | (4 | )
Corporate debt securities: |  |  |  |  |  |  |  |
Financial |  | 5,648 |  |  | (128 | ) |  | 325 |  |  | (9 | )
Industrial |  | 4,702 |  |  | (117 | ) |  | 397 |  |  | (11 | )
Other |  | 727 |  |  | (18 | ) |  | 93 |  |  | (3 | )
Residential-mortgage-backed securities |  | 1,464 |  |  | (39 | ) |  | 226 |  |  | (7 | )
Other mortgage- and asset-backed securities |  | 1,105 |  |  | (22 | ) |  | 162 |  |  | (4 | )
Total |  | $ | 20,139 |  |  | $ | (468 | ) |  | $ | 1,370 |  |  | $ | (40 | )
|  | Less than 12 months |  | 12 months or more
Type of security as of December 31, 2017 |  | Fair value |  | Unrealized losses |  | Fair value |  | Unrealized losses
U.S. Treasury securities |  | $ | 7,728 |  |  | $ | (70 | ) |  | $ | 195 |  |  | $ | (2 | )
Other government-related debt securities: |  |  |  |  |  |  |  |
U.S. |  | 188 |  |  | (1 | ) |  | 34 |  |  | (1 | )
Foreign and other |  | 1,163 |  |  | (9 | ) |  | 115 |  |  | (2 | )
Corporate debt securities: |  |  |  |  |  |  |  |
Financial |  | 5,928 |  |  | (28 | ) |  | 462 |  |  | (6 | )
Industrial |  | 5,760 |  |  | (43 | ) |  | 612 |  |  | (9 | )
Other |  | 868 |  |  | (4 | ) |  | 117 |  |  | (2 | )
Residential-mortgage-backed securities |  | 1,838 |  |  | (24 | ) |  | 276 |  |  | (6 | )
Other mortgage- and asset-backed securities |  | 1,777 |  |  | (12 | ) |  | 250 |  |  | (3 | )
Total |  | $ | 25,250 |  |  | $ | (191 | ) |  | $ | 2,061 |  |  | $ | (31 | )
The primary objective of our investment portfolio is to enhance overall returns in an efficient manner while maintaining safety of principal, prudent levels of liquidity and acceptable levels of risk. Our investment policy limits interest-bearing security investments to certain types of debt and money market instruments issued by institutions with primarily investment-grade credit ratings, and it places restrictions on maturities and concentration by asset class and issuer. We review our available-for-sale investments for other-than-temporary declines in fair value below our cost basis each quarter and whenever events or changes in circumstances indicate that the cost basis of an asset may not be recoverable. The evaluation is based on a number of factors, including the length of time and the extent to which the fair value has been below our cost basis and adverse conditions related specifically to the security, including any changes to the credit rating of the security, and the intent to sell, or whether we will more likely than not be required to sell, the security before recovery of its amortized cost basis. Our assessment of whether a security is other-than-temporarily impaired could change in the future based on new developments or changes in assumptions related to that particular security. As of March 31, 2018 and December 31, 2017, we believe the cost bases for our available-for-sale investments were recoverable in all material respects. Equity securities We held investments in equity securities with readily determinable fair values of $155 million and $149 million as of March 31, 2018 and December 31, 2017, respectively, which are included in Other assets in the Condensed Consolidated Balance Sheets. As a result of the adoption of the new accounting standard related to the classification and measurement of financial instruments on January 1, 2018, equity investments (except for investments accounted for under the equity method of accounting) are now measured at fair value, with changes in fair value recognized in earnings. These investments were previously measured at fair value, with changes in fair value recognized in AOCI. Accordingly, these securities are no longer classified as available-for-sale and their presentation is not comparable to the presentation as of December 31, 2017. See Note 1, Summary of significant accounting policies, as well as Available-for-sale investments discussed above. Gains and losses recognized on equity securities, including gains and losses recognized on sales, were not material for the three months ended March 31, 2018 and 2017. Unrealized gains and losses on equity securities held as of March 31, 2018, were not material. Limited partnership investments We held limited partnership investments of $254 million and $213 million as of March 31, 2018 and December 31, 2017, respectively, which are included in Other assets in the Condensed Consolidated Balance Sheets. These investments are measured by using the net asset values of the underlying investments as a practical expedient. These investments are typically redeemable only through distributions upon liquidation of the underlying assets. As of March 31, 2018, unfunded additional commitments to be made during the next several years for these investments were approximately $90 million.

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