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Marketable Securities (Narrative) (Details) $ in Millions | Dec. 31, 2015 USD ($) security | Dec. 31, 2014 USD ($)
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ 6 | $ 12
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 6 | $ 12
Unrealized losses that arose within the last 12 months | $ 1 |
Number of available-for-sale securities in unrealized loss position for less than one year | security | 1 |
Market value of securities that have been in an unrealized loss position for less than 12 months | $ 4 |
Market value of securities that have been in an unrealized loss position for twelve months or longer | $ 2 |
Number of available-for-sale securities in unrealized loss position for greater than or equal to one year | security | 1 |

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