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Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2015
Financial Instruments |
Carrying amounts and fair values of the financial instruments | The carrying amounts and fair values of our financial instruments were as follows (in millions):
|  | March 31, 2015 |  | December 31, 2014 |
|  | Carrying amount |  | Fair value |  | Carrying amount |  | Fair value |
Cash and cash equivalents |  | $ | 2,682 |  | $ | 2,682 |  | $ | 2,635 |  | $ | 2,635 |
Notes and other loans receivable |  | 15 |  | 15 |  | 15 |  | 15 |
Restricted cash investments |  | 296 |  | 309 |  | 377 |  | 394 |
Long-term debt, including current maturities |  | 10,020 |  | 8,834 |  | 10,092 |  | 9,778 |
Derivative instruments, assets |  | 33 |  | 33 |  | 15 |  | 15 |

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