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Investments (Tables) | 9 Months Ended
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Sep. 30, 2017
Schedule of Available-For-Sale Securities [Line Items] |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
|  | September 30, 2017 |  | December 31, 2016
(In Millions) |  | Adjusted Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Adjusted Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Corporate debt |  | $ | 2,603 |  |  | $ | 12 |  |  | $ | (7 | ) |  | $ | 2,608 |  |  | $ | 3,847 |  |  | $ | 4 |  |  | $ | (14 | ) |  | $ | 3,837 |
Financial institution instruments |  | 7,709 |  |  | 6 |  |  | (4 | ) |  | 7,711 |  |  | 6,098 |  |  | 5 |  |  | (11 | ) |  | 6,092 |
Government debt |  | 986 |  |  | 3 |  |  | (3 | ) |  | 986 |  |  | 1,581 |  |  | — |  |  | (8 | ) |  | 1,573 |
Marketable equity securities |  | 2,101 |  |  | 3,958 |  |  | — |  |  | 6,059 |  |  | 2,818 |  |  | 3,363 |  |  | (1 | ) |  | 6,180 |
Total available-for-sale investments |  | $ | 13,399 |  |  | $ | 3,979 |  |  | $ | (14 | ) |  | $ | 17,364 |  |  | $ | 14,344 |  |  | $ | 3,372 |  |  | $ | (34 | ) |  | $ | 17,682 |
Available-for-sale Securities [Member] |
Schedule of Available-For-Sale Securities [Line Items] |
Investments Classified by Contractual Maturity Date [Table Text Block] | The fair value of available-for-sale debt investments, by contractual maturity, as of September 30, 2017, were as follows:
(In Millions) |  | Fair Value
Due in 1 year or less |  | $ | 3,314 |
Due in 1–2 years |  | 1,573 |
Due in 2–5 years |  | 2,200 |
Due after 5 years |  | 71 |
Instruments not due at a single maturity date |  | 4,147 |
Total |  | $ | 11,305 |

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