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Fair Value Measurements | 12 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
Fair Value Measurements | Fair Value Measurements Assets and liabilities measured and recorded at fair value on a recurring basis consisted of the following (in millions):
|  | December 31, 2017 |  | December 31, 2016
|  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Total |  |  | Level 1 |  |  | Level 2 |
Assets |  |  |  |  |  |  |  |  |  |
Equity securities |  | $ | 39 |  |  | $ | 39 |  |  | $ | — |  |  | $ | 79 |  |  | $ | 79 |  |  | $ | — |
Mutual funds |  | 917 |  |  | 917 |  |  | — |  |  | 856 |  |  | 856 |  |  | — |
U.S. Government securities |  | 116 |  |  | — |  |  | 116 |  |  | 113 |  |  | — |  |  | 113 |
Other securities |  | 170 |  |  | — |  |  | 170 |  |  | 151 |  |  | — |  |  | 151 |
Derivatives |  | 23 |  |  | — |  |  | 23 |  |  | 27 |  |  | — |  |  | 27 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  | 106 |  |  | — |  |  | 106 |  |  | 85 |  |  | — |  |  | 85 |
Assets measured at NAV |  |  |  |  |  |  |  |  |  |  |  |
Other commingled funds |  | 19 |  |  |  |  |  |  | — |  |  |  |  |
Substantially all assets measured at fair value, other than derivatives, represent investments classified as trading securities held in a separate trust to fund certain of our non-qualified deferred compensation plans and are recorded in other noncurrent assets on our consolidated balance sheets. The fair values of equity securities and mutual funds are determined by reference to the quoted market price per unit in active markets multiplied by the number of units held without consideration of transaction costs. The fair values of U.S. Government and other securities are determined using pricing models that use observable inputs (e.g., interest rates and yield curves observable at commonly quoted intervals), bids provided by brokers or dealers or quoted prices of securities with similar characteristics. The fair values of derivative instruments, which consist of foreign currency exchange forward and interest rate swap contracts, primarily are determined based on the present value of future cash flows using model-derived valuations that use observable inputs such as interest rates, credit spreads and foreign currency exchange rates. Certain other investments are measured at fair value using their NAV per share and do not have readily determined values and are thus not subject to leveling in the fair value hierarchy. We did not have any transfers of assets or liabilities between levels of the fair value hierarchy during 2017. In addition to the financial instruments listed in the table above, we hold other financial instruments, including cash and cash equivalents, receivables, accounts payable and debt. The carrying amounts for cash and cash equivalents, receivables and accounts payable approximated their fair values. The estimated fair value of our outstanding debt was $16.8 billion and $16.2 billion at December 31, 2017 and 2016. The outstanding principal amount was $15.5 billion and $15.3 billion at December 31, 2017 and 2016, excluding $1.2 billion and $1.0 billion of unamortized discounts and issuance costs. The estimated fair values of our outstanding debt were determined based on quoted prices for similar instruments in active markets (Level 2). In connection with the Sikorsky acquisition, we recorded the assets acquired and liabilities assumed at fair value. See “Note 3 – Acquisitions and Divestitures” for further information about the fair values assigned.

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- Definition The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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