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Investments (Tables) | 3 Months Ended
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Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
Amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of available-for-sale investments by type of security | 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 |
Fair values of available-for-sale investments by classification in the Consolidated Balance Sheets | 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 |
Fair values of available-for-sale interest-bearing security investments by contractual maturity | 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 |
Available-for-sale securities, continuous unrealized loss position, fair value | he 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 | )

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