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Marketable Securities (Contractual maturity) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Marketable securities by contractual maturity |  |
Due in one year or less | $ 1,071 |
Due after one year through five years | 18 |
Due after five years through ten years | 14 |
Total marketable securities | $ 1,103 | $ 297

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- Definition Fair value of available-for-sale debt securities maturing in the sixth through tenth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Fair value of available-for-sale debt securities maturing in the second through fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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