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Fair Value Measurements (Net Carrying Value And Estimated Fair Value Of Available-For-Sale Marketable Securities) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Due in one year or less, Cost $ 425
Due in one year or less, Estimated Fair Value 424
Due after one year through three years, Cost 1,989
Due after one year through three years, Estimated Fair Value 1,989
Due after three years, Cost 228
Due after three years, Estimated Fair Value 228
Fair value of available-for-sale marketable securities, Cost 2,642
Fair value of available-for-sale marketable securities, Estimated Fair Value $ 2,641