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Marketable Securities | 12 Months Ended
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Dec. 31, 2017
Marketable Securities [Abstract] |
Marketable Securities | Marketable Securities The following table summarizes the fair value of cash equivalents and marketable securities which approximates cost:
| Fair Value Level |  | December 31, 2017 |  | December 31, 2016
Cash and cash equivalents |  |  |  |  |
Cash, cash equivalents and time deposits |  |  | $ | 6,962 |  |  | $ | 5,692 |
Available-for-sale securities |  |  |  |  |  |  |
U.S. government and agencies | 2 |  | 750 |  |  | 1,158 |
Corporate debt | 2 |  | 3,032 |  |  | 2,524 |
Money market funds | 1 |  | 2,814 |  |  | 1,801 |
Sovereign debt | 2 |  | 1,954 |  |  | 1,399 |
Total available-for-sale securities – cash equivalents |  |  | 8,550 |  |  | 6,882 |
Total cash and cash equivalents |  |  | $ | 15,512 |  |  | $ | 12,574 |
Marketable securities |  |  |  |  |  |  |
U.S. government and agencies | 2 |  | $ | 3,310 |  |  | $ | 5,886 |
Corporate debt | 2 |  | 3,665 |  |  | 3,611 |
Mortgage and asset-backed | 2 |  | 635 |  |  | 197 |
Sovereign debt | 2 |  | 703 |  |  | 2,147 |
Total available-for-sale securities – marketable securities |  |  | $ | 8,313 |  |  | $ | 11,841 |
Restricted cash |  |  |  |  |  |  |
Cash, cash equivalents and time deposits |  |  | $ | 219 |  |  | $ | 248 |
Available-for-sale securities, primarily money market funds | 1 |  | 2,117 |  |  | 1,665 |
Total restricted cash |  |  | $ | 2,336 |  |  | $ | 1,913 |
Available-for-sale securities included above with contractual maturities(a) |  |  |  |  |  |  |
Due in one year or less |  |  | $ | 8,539 |  |  |  |
Due between one and five years |  |  | 4,875 |  |  |  |
Total available-for-sale securities with contractual maturities |  |  | $ | 13,414 |  |  |  |
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(a) | Excludes mortgage and asset-backed securities.
Sales proceeds from investments classified as available-for-sale and sold prior to maturity were $5.6 billion, $8.5 billion and $7.9 billion in the years ended December 31, 2017, 2016 and 2015. Net unrealized gains and losses on available-for-sale securities and realized gains and losses on trading securities were insignificant in the years ended December 31, 2017, 2016 and 2015. Cumulative unrealized gains and losses on available-for-sale securities were insignificant at December 31, 2017 and 2016. The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the consolidated balance sheets that sum to the total of the same amounts shown in the consolidated statements of cash flows:
| December 31, 2017 |  | December 31, 2016
Cash and cash equivalents | $ | 15,512 |  |  | $ | 12,574 |
Restricted cash included in Other current assets | 1,745 |  |  | 1,382 |
Restricted cash included in Other assets | 591 |  |  | 531 |
Total | $ | 17,848 |  |  | $ | 14,487 |

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- Definition The entire disclosure of cash, cash equivalents, and debt and equity securities, including any unrealized or realized gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 305 -URI http://asc.fasb.org/topic&trid=2122426 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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