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Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities [Table Text Block] |
| Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
| (In millions)
September 30, 2016 |  |  |  |  |  |  |
United States government obligations |  |  |  |  |  |  |
Maturity less than 1 year | $ | 253 |  |  | $ | — |  |  | $ | — |  |  | $ | 253 |
Maturity 1 to 5 years | 115 |  |  | — |  |  | — |  |  | 115 |
Corporate debt securities |  |  |  |  |  |  |  |  |  |  |
Maturity less than 1 year | 2 |  |  | — |  |  | — |  |  | 2 |
Maturity 1 to 5 years | 67 |  |  | 2 |  |  | — |  |  | 69 |
Other debt securities |  |  |  |  |  |  |  |  |  |  |
Maturity less than 1 year | 1 |  |  | — |  |  | — |  |  | 1 |
Equity securities |  |  |  |  |  |  |  |  |  |
Available-for-sale | 301 |  |  | — |  |  | (23 | ) |  | 278 |
| $ | 739 |  |  | $ | 2 |  |  | $ | (23 | ) |  | $ | 718 |
| Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
| (In millions)
December 31, 2015 |  |  |  |  |  |  |
United States government obligations |  |  |  |  |  |  |
Maturity less than 1 year | $ | 256 |  |  | $ | — |  |  | $ | — |  |  | $ | 256 |
Maturity 1 to 5 years | 116 |  |  | — |  |  | — |  |  | 116 |
Corporate debt securities |  |  |  |  |  |  |  |  |  |  |
Maturity 1 to 5 years | 26 |  |  | — |  |  | — |  |  | 26 |
Other debt securities |  |  |  |  |  |  |  |  |  |  |
Maturity less than 1 year | 182 |  |  | — |  |  | — |  |  | 182 |
Maturity 1 to 5 years | 3 |  |  | — |  |  | — |  |  | 3 |
Equity securities |  |  |  |  |  |  |  |  |  |  |
Available-for-sale | 296 |  |  | 4 |  |  | (6 | ) |  | 294 |
| $ | 879 |  |  | $ | 4 |  |  | $ | (6 | ) |  | $ | 877 |

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