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Other Financial Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Derivative [Line Items] |  |  |
Restricted cash | $ 55 | $ 6 | $ 4
Carrying value |  |  |
Derivative [Line Items] |  |  |
Long-term debt, less amount due within one year | 4,906 | 5,896 |
Fair value |  |  |
Derivative [Line Items] |  |  |
Long-term debt, less amount due within one year | $ 5,337 | $ 5,873 |

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