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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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- 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=75030427&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=82897076&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=82896770&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=82897076&loc=d3e27161-111563 + Details
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