Marketable and Other Securities

The following table summarizes the fair value of cash equivalents and marketable debt and equity securities which approximates cost:



	Fair Value Level	March 31, 2018		December 31, 2017
Cash and cash equivalents
Cash and time deposits		$	8,405	$	6,962
Available-for-sale debt securities
U.S. government and agencies	2	—		750
Corporate debt	2	2,374		3,032
Sovereign debt	2	337		1,954
Total available-for-sale debt securities – cash equivalents		2,711		5,736
Money market funds	1	3,140		2,814
Total cash and cash equivalents		$	14,256	$	15,512
Marketable debt securities
U.S. government and agencies	2	$	2,272	$	3,310
Corporate debt	2	3,362		3,665
Mortgage and asset-backed	2	642		635
Sovereign debt	2	834		703
Total available-for-sale debt securities – marketable securities		$	7,110	$	8,313
Restricted cash
Cash and cash equivalents		$	232	$	219
Money market funds	1	3,059		2,117
Total restricted cash		$	3,291	$	2,336

Available-for-sale debt securities included above with contractual maturities(a)
Due in one year or less		$	4,494
Due between one and five years		4,685
Total available-for-sale debt securities with contractual maturities		$	9,179

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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 $920 million and $626 million in the three months ended March 31, 2018 and 2017. Net unrealized gains and losses on available-for-sale debt securities were insignificant in the three months ended March 31, 2018 and 2017. Cumulative unrealized gains and losses on available-for-sale debt securities were insignificant at March 31, 2018 and December 31, 2017.

Investments in equity securities where market quotations are not available are accounted for at fair value primarily using Level 3 inputs. The fair value of these securities at March 31, 2018 and unrealized gains and losses recognized in the three months ended March 31, 2018 were insignificant. Refer to Note 1 for additional details on the adoption of ASU 2016-01.

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the condensed consolidated balance sheet to the total shown in the condensed consolidated statement of cash flows:



	March 31, 2018
Cash and cash equivalents	$	14,256
Restricted cash included in Other current assets	2,713
Restricted cash included in Other assets	578
Total	$	17,547