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Financial Instruments - Information on Available-for-sale Investments (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Fair Value	$ 16,267	$ 20,179
Amortized Cost	16,216	20,158
Gross Unrealized Gains	102	89
Gross Unrealized Losses	(51)	(68)
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Fair Value	773	4,330
Amortized Cost	773	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	10,445	10,577
Amortized Cost	10,455	10,601
Gross Unrealized Gains	19	15
Gross Unrealized Losses	(29)	(39)
U.S. government and agency securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value	2,011	2,232
Amortized Cost	2,021	2,244
Gross Unrealized Gains	1	1
Gross Unrealized Losses	(11)	(13)
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value	1,410	1,376
Amortized Cost	1,411	1,380
Gross Unrealized Gains	2	1
Gross Unrealized Losses	(3)	(5)
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value	712	796
Amortized Cost	717	801
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(5)	(6)
Foreign government bonds
Schedule of Available-for-sale Securities [Line Items]
Fair Value	560	519
Amortized Cost	561	521
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(2)	(2)
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value	356	349
Amortized Cost	278	281
Gross Unrealized Gains	79	71
Gross Unrealized Losses	$ (1)	$ (3)

X

- Definition

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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