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Financial Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financial instruments |  |
Restricted cash and cash equivalents | $ 558 | $ 429
Long-term debt, including current maturities | 9,261 | 9,978
Carrying amount |  |
Financial instruments |  |
Cash and cash equivalents | 1,790 | 2,160
Restricted cash and cash equivalents | 558 | 429
Restricted investments |  | 123
Long-term debt, including current maturities | 9,261 | 9,978
Derivative instruments, assets | 1 |
Derivative instruments, liabilities |  | 6
Fair value |  |
Financial instruments |  |
Cash and cash equivalents | 1,790 | 2,160
Restricted cash and cash equivalents | 558 | 429
Restricted investments |  | 123
Long-term debt, including current maturities | 8,976 | 9,212
Derivative instruments, assets | $ 1 |
Derivative instruments, liabilities |  | 6
Other current assets |  |
Financial instruments |  |
Restricted cash and cash equivalents |  | 428
Other assets |  |
Financial instruments |  |
Restricted cash and cash equivalents |  | 1
Significant other observable inputs | Other current assets | Fair value |  |
Financial instruments |  |
Restricted investments |  | $ 123

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