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Financial Instruments (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financial instruments |  |
Restricted cash and cash equivalents | $ 568 | $ 456
Long-term debt, including current maturities | 9,327 | 7,396
Carrying amount |  |
Financial instruments |  |
Cash and cash equivalents | 2,307 | 2,519
Short-term investments |  | 450
Restricted cash and cash equivalents | 568 | 456
Restricted investments | 7 | 33
Long-term debt, including current maturities | 9,327 | 7,396
Derivative instruments, liabilities | 2 |
Fair value |  |
Financial instruments |  |
Cash and cash equivalents | 2,307 | 2,519
Short-term investments |  | 450
Restricted cash and cash equivalents | 568 | 456
Restricted investments | 7 | 33
Long-term debt, including current maturities | 9,949 | 7,538
Derivative instruments, liabilities | 2 |
Other current assets |  |
Financial instruments |  |
Restricted cash and cash equivalents | 561 | 440
Other assets |  |
Financial instruments |  |
Restricted cash and cash equivalents | 7 | 16
Significant other observable inputs |  |
Financial instruments |  |
Restricted investments, noncurrent | $ 7 |
Significant other observable inputs | Fair value |  |
Financial instruments |  |
Restricted investments |  | 33
Significant other observable inputs | Other current assets | Fair value |  |
Financial instruments |  |
Restricted investments |  | 26
Significant other observable inputs | Other assets | Fair value |  |
Financial instruments |  |
Restricted investments |  | $ 7

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