Cash, Cash Equivalents, and Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

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 (in millions):

	Fair Value Level	December 31, 2017		June 30, 2018
Cash and cash equivalents
U.S. government	1	$	—	$	10
U.S. government and agencies	2	300		—
Non-U.S. government and agencies	2	703		587
Corporate debt	2	25		460
Total marketable securities classified as cash equivalents		1,028		1,057
Cash, time deposits and money market funds		8,530		8,022
Total cash and cash equivalents		$	9,558	$	9,079
Marketable Securities
U.S. government	1	$	966	$	404
U.S. government and agencies	2	384		164
Non-U.S. government and agencies	2	660		1,045
Corporate debt	2	848		516
Other marketable securities	2	23		157
Total marketable securities		$	2,881	$	2,286

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		June 30, 2018
Cash and cash equivalents	$	9,558	$	9,079
Restricted cash included in other assets	124		146
Total cash, cash equivalents, and restricted cash	$	9,682	$	9,225