Cash, Cash Equivalents, and Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2016

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 at December 31 (in millions):

	Fair Value Level	2015		2016
Cash and cash equivalents
U.S. government	1	$	—	$	924
U.S. government and agencies	2	—		—
Non-U.S. government and agencies	2	266		142
Corporate debt	2	—		—
Total marketable securities classified as cash equivalents		266		1,066
Cash, time deposits and money market funds		8,620		7,011
Total cash and cash equivalents		$	8,886	$	8,077
Marketable Securities
U.S. government	1	$	298	$	1,634
U.S. government and agencies	2	1,169		505
Non-U.S. government and agencies	2	832		632
Corporate debt	2	384		475
Other marketable securities	2	40		34
Total marketable securities		$	2,723	$	3,280