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Fair Value (Tables) | 9 Months Ended
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Sep. 30, 2017
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] | Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis
|  | September 30, 2017 |  | December 31, 2016
|  | Fair Value Measured and Recorded at Reporting Date Using |  |  |  | Fair Value Measured and Recorded at Reporting Date Using |  |
(In Millions) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt |  | $ | — |  |  | $ | 150 |  |  | $ | — |  |  | $ | 150 |  |  | $ | — |  |  | $ | 498 |  |  | $ | — |  |  | $ | 498 |
Financial institution instruments 1 |  | 4,146 |  |  | 1,619 |  |  | — |  |  | 5,765 |  |  | 1,920 |  |  | 811 |  |  | — |  |  | 2,731 |
Government debt 2 |  | — |  |  | 100 |  |  | — |  |  | 100 |  |  | — |  |  | 332 |  |  | — |  |  | 332 |
Reverse repurchase agreements |  | — |  |  | 1,599 |  |  | — |  |  | 1,599 |  |  | — |  |  | 768 |  |  | — |  |  | 768 |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt |  | — |  |  | 750 |  |  | 6 |  |  | 756 |  |  | — |  |  | 1,332 |  |  | 6 |  |  | 1,338 |
Financial institution instruments 1 |  | — |  |  | 557 |  |  | — |  |  | 557 |  |  | — |  |  | 1,603 |  |  | — |  |  | 1,603 |
Government debt 2 |  | — |  |  | 133 |  |  | — |  |  | 133 |  |  | — |  |  | 284 |  |  | — |  |  | 284 |
Trading assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset-backed securities |  | — |  |  | 12 |  |  | — |  |  | 12 |  |  | — |  |  | 87 |  |  | — |  |  | 87 |
Corporate debt |  | — |  |  | 2,269 |  |  | — |  |  | 2,269 |  |  | — |  |  | 2,847 |  |  | — |  |  | 2,847 |
Financial institution instruments 1 |  | 57 |  |  | 990 |  |  | — |  |  | 1,047 |  |  | 36 |  |  | 1,608 |  |  | — |  |  | 1,644 |
Government debt 2 |  | 31 |  |  | 3,624 |  |  | — |  |  | 3,655 |  |  | 32 |  |  | 3,704 |  |  | — |  |  | 3,736 |
Other current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative assets |  | 2 |  |  | 289 |  |  | — |  |  | 291 |  |  | — |  |  | 382 |  |  | — |  |  | 382 |
Loans receivable |  | — |  |  | 88 |  |  | — |  |  | 88 |  |  | — |  |  | 326 |  |  | — |  |  | 326 |
Marketable equity securities |  | 5,584 |  |  | 475 |  |  | — |  |  | 6,059 |  |  | 6,180 |  |  | — |  |  | — |  |  | 6,180 |
Other long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt |  | — |  |  | 1,697 |  |  | 5 |  |  | 1,702 |  |  | — |  |  | 1,995 |  |  | 6 |  |  | 2,001 |
Financial institution instruments 1 |  | — |  |  | 1,389 |  |  | — |  |  | 1,389 |  |  | — |  |  | 1,758 |  |  | — |  |  | 1,758 |
Government debt 2 |  | — |  |  | 753 |  |  | — |  |  | 753 |  |  | — |  |  | 957 |  |  | — |  |  | 957 |
Other long-term assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative assets |  | — |  |  | 74 |  |  | 9 |  |  | 83 |  |  | — |  |  | 31 |  |  | 9 |  |  | 40 |
Loans receivable |  | — |  |  | 543 |  |  | — |  |  | 543 |  |  | — |  |  | 236 |  |  | — |  |  | 236 |
Total assets measured and recorded at fair value |  | 9,820 |  |  | 17,111 |  |  | 20 |  |  | 26,951 |  |  | 8,168 |  |  | 19,559 |  |  | 21 |  |  | 27,748 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other accrued liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative liabilities |  | — |  |  | 449 |  |  | — |  |  | 449 |  |  | — |  |  | 371 |  |  | — |  |  | 371 |
Other long-term liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative liabilities |  | — |  |  | 166 |  |  | 7 |  |  | 173 |  |  | — |  |  | 179 |  |  | 33 |  |  | 212 |
Total liabilities measured and recorded at fair value |  | $ | — |  |  | $ | 615 |  |  | $ | 7 |  |  | $ | 622 |  |  | $ | — |  |  | $ | 550 |  |  | $ | 33 |  |  | $ | 583 |
Financial Instruments Not Recorded At Fair Value On Recurring Basis [Table Text Block] | The carrying amounts and fair values of financial instruments not recorded at fair value on a recurring basis at the end of each period were as follows:
|  | September 30, 2017
(In Millions) |  | Carrying Amount |  | Fair Value Measured Using |  | Fair Value
Level 1 |  | Level 2 |  | Level 3 |
Grants receivable |  | $ | 646 |  |  | $ | — |  |  | $ | 646 |  |  | $ | — |  |  | $ | 646 |
Loans receivable |  | $ | 15 |  |  | $ | — |  |  | $ | 15 |  |  | $ | — |  |  | $ | 15 |
Non-marketable cost method investments |  | $ | 2,719 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,336 |  |  | $ | 3,336 |
Reverse repurchase agreements |  | $ | 250 |  |  | $ | — |  |  | $ | 250 |  |  | $ | — |  |  | $ | 250 |
Short-term debt |  | $ | 4,121 |  |  | $ | — |  |  | $ | 4,703 |  |  | $ | — |  |  | $ | 4,703 |
Long-term debt |  | $ | 27,498 |  |  | $ | — |  |  | $ | 29,485 |  |  | $ | — |  |  | $ | 29,485 |
|  | December 31, 2016
(In Millions) |  | Carrying Amount |  | Fair Value Measured Using |  | Fair Value
Level 1 |  | Level 2 |  | Level 3 |
Grants receivable |  | $ | 361 |  |  | $ | — |  |  | $ | 362 |  |  | $ | — |  |  | $ | 362 |
Loans receivable |  | $ | 265 |  |  | $ | — |  |  | $ | 265 |  |  | $ | — |  |  | $ | 265 |
Non-marketable cost method investments |  | $ | 3,098 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,890 |  |  | $ | 3,890 |
Reverse repurchase agreements |  | $ | 250 |  |  | $ | — |  |  | $ | 250 |  |  | $ | — |  |  | $ | 250 |
Short-term debt |  | $ | 4,609 |  |  | $ | — |  |  | $ | 5,120 |  |  | $ | — |  |  | $ | 5,120 |
Long-term debt |  | $ | 20,649 |  |  | $ | — |  |  | $ | 21,957 |  |  | $ | — |  |  | $ | 21,957 |

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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