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Financial Instruments - Information on Available-for-sale Investments (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Fair Value	$ 15,183	$ 20,179
Amortized Cost	15,241	20,158
Gross Unrealized Gains	27	89
Gross Unrealized Losses	(85)	(68)
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Fair Value	159	4,330
Amortized Cost	159	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	9,806	10,577
Amortized Cost	9,837	10,601
Gross Unrealized Gains	9	15
Gross Unrealized Losses	(40)	(39)
U.S. government and agency securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value	2,042	2,232
Amortized Cost	2,059	2,244
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(17)	(13)
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value	1,542	1,376
Amortized Cost	1,548	1,380
Gross Unrealized Gains	1	1
Gross Unrealized Losses	(7)	(5)
Foreign government bonds
Schedule of Available-for-sale Securities [Line Items]
Fair Value	733	519
Amortized Cost	739	521
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(6)	(2)
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value	626	796
Amortized Cost	634	801
Gross Unrealized Gains	1	1
Gross Unrealized Losses	(9)	(6)
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value	275	349
Amortized Cost	265	281
Gross Unrealized Gains	16	71
Gross Unrealized Losses	$ (6)	$ (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
-Paragraph 1
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+ References

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