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