Cash, Cash Equivalents, and Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2018

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The following table categorizes the fair values of cash, cash equivalents, and marketable securities measured at fair value on a recurring basis on our balance sheet at December 31 (in millions):



	Fair Value Level	2017		2018
Cash and cash equivalents
U.S. government	1	$	—	$	139
U.S. government and agencies	2	300		25
Non-U.S. government and agencies	2	703		114
Corporate debt	2	25		884
Total marketable securities classified as cash equivalents		1,028		1,162
Cash, time deposits and money market funds		8,530		8,445
Total cash and cash equivalents		$	9,558	$	9,607

Marketable Securities
U.S. government	1	$	966	$	289
U.S. government and agencies	2	384		65
Non-U.S. government and agencies	2	660		610
Corporate debt	2	848		198
Other marketable securities	2	23		146
Total marketable securities		$	2,881	$	1,308

Schedule of cash, cash equivalents and restricted cash [Table Text Block]

Cash, cash equivalents, and restricted cash as reported in the statement of cash flows are presented separately on our consolidated balance sheet as follows (in millions):



	December 31, 2017		December 31, 2018
Cash and cash equivalents	$	9,558	$	9,607
Restricted cash included in other assets (a)	124		140
Total cash, cash equivalents, and restricted cash	$	9,682	$	9,747

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(a)	Restricted cash primarily includes cash held to meet certain local governmental and regulatory reserve requirements and cash held under the terms of certain contractual agreements. Restricted cash does not include required minimum balances or cash securing debt issued through securitization transactions.