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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)

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- 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 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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