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Available-for-sale investments (Tables) | 12 Months Ended
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Dec. 31, 2017
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):
|  | Year ended December 31, 2017
Type of security |  | 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 |
|  | Year ended December 31, 2016
Type of security |  | Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
U.S. Treasury securities |  | $ | 6,681 |  |  | $ | 1 |  |  | $ | (68 | ) |  | $ | 6,614 |
Other government-related debt securities: |  |  |  |  |  |  |  |
U.S. |  | 302 |  |  | — |  |  | (3 | ) |  | 299 |
Foreign and other |  | 1,784 |  |  | 9 |  |  | (34 | ) |  | 1,759 |
Corporate debt securities: |  |  |  |  |  |  |  |
Financial |  | 8,476 |  |  | 21 |  |  | (37 | ) |  | 8,460 |
Industrial |  | 8,793 |  |  | 59 |  |  | (63 | ) |  | 8,789 |
Other |  | 1,079 |  |  | 5 |  |  | (7 | ) |  | 1,077 |
Residential mortgage-backed securities |  | 1,968 |  |  | 1 |  |  | (29 | ) |  | 1,940 |
Other mortgage- and asset-backed securities |  | 1,731 |  |  | 1 |  |  | (13 | ) |  | 1,719 |
Money market mutual funds |  | 2,782 |  |  | — |  |  | — |  |  | 2,782 |
Other short-term interest-bearing securities |  | 4,188 |  |  | — |  |  | — |  |  | 4,188 |
Total interest-bearing securities |  | 37,784 |  |  | 97 |  |  | (254 | ) |  | 37,627 |
Equity securities |  | 127 |  |  | 31 |  |  | (4 | ) |  | 154 |
Total available-for-sale investments |  | $ | 37,911 |  |  | $ | 128 |  |  | $ | (258 | ) |  | $ | 37,781 |
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 Consolidated Balance Sheets were as follows (in millions):
|  | December 31,
Consolidated Balance Sheets location |  | 2017 |  | 2016
Cash and cash equivalents |  | $ | 3,291 |  |  | $ | 2,783 |
Marketable securities |  | 37,878 |  |  | 34,844 |
Other assets |  | 149 |  |  | 154 |
Total available-for-sale investments |  | $ | 41,318 |  |  | $ | 37,781 |
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):
|  | December 31,
Contractual maturity |  | 2017 |  | 2016
Maturing in one year or less |  | $ | 6,733 |  |  | $ | 8,393 |
Maturing after one year through three years |  | 12,820 |  |  | 10,404 |
Maturing after three years through five years |  | 13,836 |  |  | 12,157 |
Maturing after five years through ten years |  | 3,263 |  |  | 2,974 |
Maturing after ten years |  | 52 |  |  | 40 |
Mortgage- and asset-backed securities |  | 4,465 |  |  | 3,659 |
Total interest-bearing securities |  | $ | 41,169 |  |  | $ | 37,627 |
Available-for-sale securities, continuous unrealized loss position, fair value | Information on 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 was as follows (in millions):
|  | Less than 12 months |  | 12 months or greater
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 | )
|  | Less than 12 months |  | 12 months or greater
Type of security as of December 31, 2016 |  | Fair value |  | Unrealized losses |  | Fair value |  | Unrealized losses
U.S. Treasury securities |  | $ | 5,774 |  |  | $ | (68 | ) |  | $ | — |  |  | $ | — |
Other government-related debt securities: |  |  |  |  |  |  |  |
U.S. |  | 201 |  |  | (3 | ) |  | — |  |  | — |
Foreign and other |  | 1,192 |  |  | (34 | ) |  | 17 |  |  | — |
Corporate debt securities: |  |  |  |  |  |  |  |
Financial |  | 3,975 |  |  | (37 | ) |  | 44 |  |  | — |
Industrial |  | 3,913 |  |  | (61 | ) |  | 149 |  |  | (2 | )
Other |  | 486 |  |  | (7 | ) |  | 7 |  |  | — |
Residential mortgage-backed securities |  | 1,631 |  |  | (26 | ) |  | 158 |  |  | (3 | )
Other mortgage- and asset-backed securities |  | 1,087 |  |  | (10 | ) |  | 118 |  |  | (3 | )
Equity securities |  | 22 |  |  | (4 | ) |  | — |  |  | — |
Total |  | $ | 18,281 |  |  | $ | (250 | ) |  | $ | 493 |  |  | $ | (8 | )

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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