Cash, Cash Equivalents, and Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2017

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	2016		2017
Cash and cash equivalents
U.S. government	1	$	924	$	—
U.S. government and agencies	2	—		300
Non-U.S. government and agencies	2	142		703
Corporate debt	2	—		25
Total marketable securities classified as cash equivalents		1,066		1,028
Cash, time deposits and money market funds		7,011		8,530
Total cash and cash equivalents		$	8,077	$	9,558

Marketable Securities
U.S. government	1	$	1,634	$	966
U.S. government and agencies	2	505		384
Non-U.S. government and agencies	2	632		660
Corporate debt	2	475		848
Other marketable securities	2	34		23
Total marketable securities		$	3,280	$	2,881