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Financial Instruments - Information on Available-for-sale Investments (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Fair Value	$ 17,139	$ 20,179
Amortized Cost	17,054	20,158
Gross Unrealized Gains	123	89
Gross Unrealized Losses	(38)	(68)
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Fair Value	1,607	4,330
Amortized Cost	1,607	4,330
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Corporate notes and bonds
Schedule of Available-for-sale Securities [Line Items]
Fair Value	10,469	10,577
Amortized Cost	10,460	10,601
Gross Unrealized Gains	28	15
Gross Unrealized Losses	(19)	(39)
U.S. government and agency securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value	2,009	2,232
Amortized Cost	2,018	2,244
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(9)	(13)
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value	1,399	1,376
Amortized Cost	1,399	1,380
Gross Unrealized Gains	2	1
Gross Unrealized Losses	(2)	(5)
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value	710	796
Amortized Cost	714	801
Gross Unrealized Gains	1	1
Gross Unrealized Losses	(5)	(6)
Foreign government bonds
Schedule of Available-for-sale Securities [Line Items]
Fair Value	569	519
Amortized Cost	571	521
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2)	(2)
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value	376	349
Amortized Cost	285	281
Gross Unrealized Gains	92	71
Gross Unrealized Losses	$ (1)	$ (3)

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
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