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Derivative and Financial Instruments - Financial Instruments at fair value (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Cash and cash equivalents | $ 2,490 | $ 5,088
Short-term Investments | 4,032 | 3,028
Investments and long-term receiavables | 8,295 | 8,687
Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cash and cash equivalents | 3 | 9
Short-term Investments | 273 | 99
Investments and long-term receiavables | 206 | 133
Corporate Bonds [Member] | Remaining maturities within one year [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cash and cash equivalents | 0 | 1
Short-term Investments | 157 | 59
Investments and long-term receiavables | 0 | 0
Corporate Bonds [Member] | Remaining Maturities Greater Than One Year Through Five Years [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cash and cash equivalents | 0 | 0
Short-term Investments | 0 | 0
Investments and long-term receiavables | 128 | 99
Commercial Paper [Member] | Remaining maturities within one year [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cash and cash equivalents | 3 | 8
Short-term Investments | 108 | 30
Investments and long-term receiavables | 0 | 0
Government obligations [Member] | Remaining maturities within one year [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cash and cash equivalents | 0 | 0
Short-term Investments | 8 | 10
Investments and long-term receiavables | 0 | 0
Government obligations [Member] | Remaining Maturities Greater Than One Year Through Five Years [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cash and cash equivalents | 0 | 0
Short-term Investments | 0 | 0
Investments and long-term receiavables | 13 | 15
U.S. Government Agency Obligations [Member] | Remaining Maturities Greater Than One Year Through Five Years [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cash and cash equivalents | 0 | 0
Short-term Investments | 0 | 0
Investments and long-term receiavables | 17 | 0
Foreign government obligations [Member] | Remaining Maturities Greater Than One Year Through Five Years [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cash and cash equivalents | 0 | 0
Short-term Investments | 0 | 0
Investments and long-term receiavables | 2 | 0
Asset-backed Securities [Member] | Remaining Maturities Greater Than One Year Through Five Years [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cash and cash equivalents | 0 | 0
Short-term Investments | 0 | 0
Investments and long-term receiavables | $ 46 | $ 19

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