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FAIR VALUE OF FINANCIAL INVESTMENTS AND LIABILITIES - Fair Value of Debt (Details) - USD ($) $ in Billions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value |  |
Fair value of debt |  |
Long-term and short-term debt | $ 3.3 | $ 3.6
Carrying Value |  |
Fair value of debt |  |
Long-term and short-term debt | $ 3.0 | $ 3.4

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